CN107438768B - 2.4GHz wireless code meter circuit - Google Patents
2.4GHz wireless code meter circuit Download PDFInfo
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- CN107438768B CN107438768B CN201680009879.3A CN201680009879A CN107438768B CN 107438768 B CN107438768 B CN 107438768B CN 201680009879 A CN201680009879 A CN 201680009879A CN 107438768 B CN107438768 B CN 107438768B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
- G01P3/48—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage
- G01P3/481—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals
- G01P3/487—Devices characterised by the use of electric or magnetic means for measuring angular speed by measuring frequency of generated current or voltage of pulse signals delivered by rotating magnets
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
- G01P3/42—Devices characterised by the use of electric or magnetic means
- G01P3/50—Devices characterised by the use of electric or magnetic means for measuring linear speed
- G01P3/54—Devices characterised by the use of electric or magnetic means for measuring linear speed by measuring frequency of generated current or voltage
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Abstract
A2.4 GHz wireless code table circuit comprises a pulse detection transmitting circuit and a receiving display circuit, wherein the pulse detection transmitting circuit comprises a power supply circuit (110), a first low-voltage reset circuit (111), a pulse detection circuit and a 2.4GHz wireless transmitting circuit, the 2.4GHz wireless transmitting circuit comprises a ninth 2.4G wireless transceiving chip (U9) and a first antenna matching circuit (112), a pulse detection interrupt pin (P10) of the ninth 2.4G wireless transceiving chip (U9) is grounded through a reed switch (G1), when the magnet is within the detection distance range of the reed switch (G1), the interior of the reed switch (G1) is conducted, when the magnet is out of the detection distance range of the reed switch (G1), the interior of the reed switch (G1) is open, a timer is arranged in the ninth 2.4G wireless transceiver chip (U9), when the timer overflows, the ninth 2.4G wireless transceiver chip (U9) transmits the detected number of pulses to the receiving display circuit through the first antenna matching circuit (112). The 2.4GHz wireless code meter circuit can reduce power consumption, improve the speed detection range and improve the reliability of the wireless code meter.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a 2.4GHz wireless code table circuit.
Background
The code tables used at present are mainly divided into two types, one is a wired code table, and the other is a wireless code table. The traditional wired code table has the problems of troublesome wiring, unattractive appearance and poor installation; the wireless code meter is simple to install and attractive. The wireless code meter speed detection device mainly comprises a reed switch and a magnet, wherein the reed switch is also called a magnetic reed switch and is a magnetic-sensitive special switch, when the magnet is close to the reed switch, the inside of the reed switch is conducted, and when the distance between the magnet and the reed switch is larger than 3-5 cm, the reed switch is opened, so that short-distance detection can be realized. However, the wireless code tables on the market generally have the problems of low reliability and high power consumption.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a 2.4GHz wireless code table circuit capable of reducing power consumption, increasing speed detection range, and improving reliability of a wireless code table, aiming at the above defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a 2.4GHz wireless code meter circuit, which comprises a pulse detection transmitting circuit and a receiving display circuit, wherein the pulse detection transmitting circuit comprises a power supply circuit, a first low-voltage reset circuit, a pulse detection circuit and a 2.4GHz wireless transmitting circuit, the 2.4GHz wireless transmitting circuit comprises a ninth 2.4G wireless transceiving chip and a first antenna matching circuit, the pulse detection circuit comprises a reed switch, a pulse detection interruption pin of the ninth 2.4G wireless transceiving chip is grounded through the reed switch, when a magnet is within a detection distance range of the reed switch, the inside of the reed switch is conducted, when the magnet is out of the detection distance range of the reed switch, the inside of the reed switch is open, a timer is arranged in the ninth 2.4G wireless transceiving chip, and when the timer overflows, the ninth 2.4G wireless transceiving chip sends the detected number of pulses to the receiving display circuit through the first antenna matching circuit, the power supply circuit is connected with one end of the first low-voltage reset circuit, and the other end of the first low-voltage reset circuit is connected with a power supply input pin of the ninth 2.4G wireless transceiver chip.
In the 2.4GHz wireless code meter circuit of the invention, the first antenna matching circuit includes a one hundred fifteenth capacitor, a one hundred twenty capacitor, a one hundred eleventh inductor and a second antenna, one end of the one hundred fifteenth capacitor is connected to a seventh pin of the ninth 2.4G wireless transceiver chip, the other end of the one hundred fifteenth capacitor is connected to one end of the one hundred eleventh inductor, the other end of the one hundred eleventh inductor is connected to one end of the one hundred twenty capacitor and one end of the second antenna, respectively, and the other end of the one hundred twenty capacitor and the other end of the second antenna are both grounded.
In the 2.4GHz wireless code meter circuit, the power supply circuit comprises a button battery and a first one hundred eleven capacitor, the first low-voltage reset circuit comprises a tenth low-voltage reset chip and a first one hundred thirteen resistor, the other pin of the ninth 2.4G wireless transceiver chip is a tenth pin, one end of the button battery and one end of the first hundred eleventh capacitor are both grounded, the other end of the button cell and the other end of the first one hundred eleven capacitor are both connected with the second pin of the tenth low-voltage reset chip, the first pin of the tenth low-voltage reset chip is grounded, the second pin of the tenth low-voltage reset chip is also respectively connected with one end of the first one hundred and thirteen resistors and the power output pin of the ninth 2.4G wireless transceiver chip, and the other end of the one hundred thirteen resistor is respectively connected with the third pin of the tenth low-voltage reset chip and the twenty-first pin of the ninth 2.4G wireless transceiver chip.
In the 2.4GHz wireless code meter circuit of the invention, the receiving display circuit comprises a voltage reduction circuit, a second low voltage reset circuit, a 2.4GHz receiving circuit, a bluetooth audio interface circuit, a dial stepper motor, an LCD driving display circuit and an LCD driving selection circuit, the 2.4GHz receiving circuit comprises a seventh 2.4GHz wireless transceiving chip and a second antenna matching circuit, the second antenna matching circuit comprises a first antenna, a fifth capacitor, a twenty-sixth capacitor and a fourth inductor, a thirteenth pin of the seventh 2.4GHz wireless transceiving chip is respectively connected with one end of the fifth capacitor and one end of the twenty-sixth capacitor through the fourth inductor, the other end of the twenty-sixth capacitor is grounded, the other end of the fifth capacitor is connected with one end of the first antenna, the other end of the first antenna is grounded, the voltage reduction circuit is connected with the second low voltage reset circuit, the second low-voltage reset circuit is further connected with the seventh 2.4GHz wireless transceiver chip, and the Bluetooth audio interface circuit, the dial plate stepping motor, the LCD driving display circuit and the LCD driving selection circuit are all connected with the seventh 2.4GHz wireless transceiver chip.
In the 2.4GHz wireless code meter circuit of the invention, the voltage-reducing circuit includes a first voltage-reducing chip, a first capacitor, a second capacitor, a third capacitor, an eleventh capacitor and a twelfth capacitor, the second low-voltage reset circuit includes a first low-voltage reset chip and a twelfth resistor, a first pin of the first voltage-reducing chip is respectively connected with one end of the first capacitor and one end of the second capacitor, the other end of the first capacitor and the other end of the second capacitor are both grounded, the first pin of the first voltage-reducing chip is further connected with a third pin thereof, a second pin of the first voltage-reducing chip is grounded, a fourth pin of the first voltage-reducing chip is grounded through the third capacitor, a fifth pin of the first voltage-reducing chip is respectively connected with one end of the eleventh capacitor and one end of the twelfth capacitor, the first pin of the first low-voltage reset chip is respectively connected with a thirty-third pin and a twelfth resistor of the seventh 2.4GHz wireless transceiver chip The second pin of the first low-voltage reset chip is grounded, and the third pin of the first low-voltage reset chip is respectively connected with the other end of the twelfth resistor and the fifth pin of the first voltage reduction chip.
In the 2.4GHz wireless code meter circuit of the invention, the bluetooth audio interface circuit includes a bluetooth audio interface, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor, a tenth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor and a thirty-first resistor, the first pin, the ninth pin and the twelfth pin of the bluetooth audio interface are connected, the third pin of the bluetooth audio interface is respectively connected with one end of the tenth resistor and the forty-ninth pin of the seventh 2.4GHz wireless transceiver chip through the sixth resistor, the eighth pin of the bluetooth audio interface is connected with the seventh pin of the seventh 2.4GHz wireless transceiver chip through the thirty-first resistor, the thirteenth pin of the bluetooth audio interface is connected with the twenty-sixth pin of the seventh 2.4GHz wireless transceiver chip through the third resistor, a fourteenth pin of the bluetooth audio interface is connected with a fifty-sixth pin of the seventh 2.4GHz wireless transceiver chip through the fourth resistor, a fifteenth pin of the bluetooth audio interface is connected with a fifty-fifth pin of the seventh 2.4GHz wireless transceiver chip through the seventh resistor, an eighteenth pin of the bluetooth audio interface is connected with a fifty-second pin of the seventh 2.4GHz wireless transceiver chip through the twenty-first resistor, a nineteenth pin of the bluetooth audio interface is connected with a fifty-first pin of the seventh 2.4GHz wireless transceiver chip through the twenty-second resistor, and a twentieth pin of the bluetooth audio interface is connected with a fifty-fifth pin of the seventh 2.4GHz wireless transceiver chip through the twenty-third resistor.
In the 2.4GHz wireless code meter circuit of the invention, the LCD driving selection circuit includes a fifth analog switch, a sixth analog switch, an eighth capacitor, a ninth capacitor, a first resistor, a second resistor, and a fourth triode, a first pin of the fifth analog switch is connected with an eighth pin of the seventh 2.4GHz wireless transceiving chip, a second pin of the fifth analog switch, a second pin of the sixth analog switch, and a second pin of the eighth analog switch are all grounded, a third pin of the fifth analog switch is connected with a second pin of the bluetooth audio interface, a fifth pin of the fifth analog switch, a fifth pin of the sixth analog switch, and a fifth pin of the eighth analog switch are respectively connected with one end of the eighth capacitor and one end of the ninth capacitor, and the other end of the eighth capacitor and the other end of the ninth capacitor are both grounded, a sixth pin of the fifth analog switch, a sixth pin of the sixth analog switch and a sixth pin of the eighth analog switch are all connected with the collector of the fourth triode, a first pin of the sixth analog switch is connected with a ninth pin of the seventh 2.4GHz wireless transceiver chip, a third pin of the sixth analog switch is connected with a fourth pin of the Bluetooth audio interface, a first pin of the eighth analog switch is connected with a tenth pin of the seventh 2.4GHz wireless transceiver chip, a third pin of the eighth analog switch is connected with a fifth pin of the bluetooth audio interface, a collector of the fourth triode is also connected with the second resistor, the base electrode of the fourth triode is connected with the twenty-ninth pin of the seventh 2.4GHz wireless transceiver chip through the first resistor, and the emitting electrode of the fourth triode is grounded.
In the 2.4GHz wireless code meter circuit of the invention, the LCD driving display circuit includes an LCD driving chip, an LCD screen, a ninth resistor, a seventh capacitor and a sixteenth capacitor, the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the LCD driving chip are respectively and correspondingly connected with the twelfth pin, the eleventh pin, the ninth pin, the eighth pin, the seventh pin, the sixth pin and the fifth pin of the LCD screen, the ninth pin of the LCD driving chip is connected with the fourth pin of the fifth analog switch, the eleventh pin of the LCD driving chip is connected with the fourth pin of the sixth analog switch, the twelfth pin of the LCD driving chip is connected with the fourth pin of the eighth analog switch, the sixteenth pin of the LCD driving chip is respectively connected with one end of the seventh capacitor and one end of the sixteenth capacitor through the ninth resistor, the other end of the seventh capacitor and the other end of the sixteenth capacitor are both grounded, a twenty-first pin, a twenty-second pin, a twenty-third pin and a twentieth pin of the LCD driver chip are respectively and correspondingly connected with a first pin, a second pin, a third pin and a fourth pin of the LCD screen, and a forty-first pin, a forty-second pin, a forty-third pin, a forty-fourth pin, a forty-fifth pin, a forty-sixth pin, a forty-seventh pin and a forty-eighth pin of the LCD driver chip are respectively and correspondingly connected with a twentieth pin, a nineteenth pin, an eighteenth pin, a seventeenth pin, a sixteenth pin, a fifteenth pin, a fourteenth pin and a thirteenth pin of the LCD screen.
In the 2.4GHz wireless code table circuit of the invention, the first pin of the dial plate stepping motor is connected with the twenty-third pin, the twenty-fourth pin and the twenty-fifth pin of the seventh 2.4GHz wireless transceiver chip, the second pin of the dial plate stepping motor is connected with the twentieth pin, the twenty-first pin and the twenty-second pin of the seventh 2.4GHz wireless transceiver chip, the third pin of the dial plate stepping motor is connected with the thirty-fourth pin, the thirty-fifth pin and the thirty-sixth pin of the seventh 2.4GHz wireless transceiver chip, and the fourth pin of the dial plate stepping motor is connected with the seventeenth pin, the eighteenth pin and the nineteenth pin of the seventh 2.4GHz wireless transceiver chip.
In the 2.4GHz wireless stopwatch circuit of the invention, the receiving and displaying circuit further comprises a dashboard LED driving circuit, the dashboard LED driving circuit comprises a third triode, a twenty-eighth resistor, a twenty-ninth resistor and a thirty-ninth resistor, a base of the third triode is connected with a forty-th pin of the seventh 2.4GHz wireless transceiver chip through the twenty-eighth resistor, a collector of the third triode is connected with a sixth pin of the dial stepper motor, one end of the thirty-fifth resistor is connected with a fifth pin of the dial stepper motor, and the other end of the thirty-fifth resistor is connected with the twenty-ninth resistor.
The 2.4GHz wireless code table circuit has the following beneficial effects: the pulse detection circuit and the 2.4GHz wireless transmitting circuit are arranged, the 2.4GHz wireless transmitting circuit comprises a ninth 2.4G wireless receiving and transmitting chip and a first antenna matching circuit, the pulse detection circuit comprises a reed switch, when a magnet is in the detection distance range of the reed switch, the inside of the reed switch is conducted, when the magnet is out of the detection distance range of the reed switch, the inside of the reed switch is opened, the ninth 2.4G wireless receiving and transmitting chip wakes up the number of detected pulses through an interruption function, the number of detected pulses in a timing period is sent to a receiving display circuit through the timer periodic waking up, and compared with the prior art, the pulse detection circuit can reduce power consumption, improve the speed detection range and improve the reliability of a wireless code table.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic circuit diagram of a pulse detection transmitting circuit in an embodiment of a 2.4GHz wireless code meter circuit according to the invention;
FIG. 2 is a schematic circuit diagram of a 2.4GHz receiving circuit in the embodiment;
FIG. 3 is a schematic circuit diagram of a buck circuit and a second low-voltage reset circuit in the embodiment;
FIG. 4 is a schematic circuit diagram of the Bluetooth audio interface circuit in the embodiment;
FIG. 5 is a schematic circuit diagram of an LCD drive selection circuit in the embodiment;
FIG. 6 is a schematic circuit diagram of an LCD driving display circuit according to the embodiment;
FIG. 7 is a schematic circuit diagram of a dial stepper motor in the embodiment;
FIG. 8 is a schematic circuit diagram of an LED driving circuit of the instrument panel in the embodiment;
FIG. 9 is a schematic circuit diagram of an LCD backlight driving circuit in the embodiment;
fig. 10 is a circuit schematic of a second crystal oscillation circuit in the embodiment;
fig. 11 is a schematic diagram of an online burning test point in the embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the 2.4GHz wireless code meter circuit of the invention, the 2.4GHz wireless code meter circuit comprises a pulse detection transmitting circuit and a receiving display circuit (not shown in the figure), and the pulse detection transmitting circuit and the receiving display circuit communicate with each other in a wireless manner. The circuit schematic diagram of the pulse detection transmitting circuit is shown in fig. 1. In fig. 1, the pulse detection transmitting circuit includes a power supply circuit 110, a first low voltage reset circuit 111, a pulse detection circuit, and a 2.4GHz wireless transmitting circuit.
Wherein, the 2.4GHz wireless transmitting circuit includes a ninth 2.4G wireless transceiving chip U9 and a first antenna matching circuit 112, the pulse detection circuit includes a reed switch G1, a pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiving chip U9 (i.e. the twenty-third pin of the ninth 2.4G wireless transceiving chip U9) is grounded through a reed switch G1, when the magnet is within the detection distance range of the reed switch G1, the inside of the reed switch G1 is conducted, when the magnet is outside the detection distance range of the reed switch G1, the inside of the reed switch G1 is opened, a timer (not shown) is built in the ninth 2.8654G wireless transceiving chip U9, when the timer overflows, the ninth 2.4G wireless transceiving chip U9 sends the detected pulse number to the receiving and displaying circuit through the first antenna matching circuit 112, the power circuit 110 is connected with one end of the first low voltage reset circuit 111, and the other end of the first reset circuit is connected with the input pin 9G wireless transceiving chip pa 24 of the ninth 2.4G wireless transceiving chip pa 24, VCCRF connections.
In this embodiment, the programmable i/o function of the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 enables the external interrupt function and the internal programmable pull-up function when the input is set. That is, the pulse detection interrupt pin P10 of the ninth 2.4G wtru chip U9 has an external interrupt, internal pull-up function.
When the tire stops, if the magnet is just stopped in the detection distance range of the reed switch G1, the interior of the reed switch G1 is always conducted, the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 is always short-circuited to the ground, at this time, if the ninth 2.4G wireless transceiver chip U9 directly enters the dormancy, the power consumption of the chip is very high, before the chip enters the dormancy, the pulse detection interrupt pin P10 needs to be set to be output low level, the ninth 2.4G wireless transceiver chip U9 wakes up by turning on a timer wake-up function, the periodic wake-up detects whether the pulse detection interrupt pin P10 is low level, if the pulse detection interrupt pin is not low level, the input is set, the external interrupt function is enabled, and the timer wake-up function is turned off to enter the dormancy. If it is low, it is still set to low, goes to sleep, and then loops accordingly.
When the tire normally rotates, if the magnet is not in the detection distance range of the reed switch G1, the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 is at a high level, the ninth 2.4G wireless transceiver chip U9 enters a sleep mode, when the tire rotates the magnet to the detection distance range of the reed switch G1, the reed switch G1 is internally conducted, the pulse detection interrupt pin P10 of the ninth 2.4G wireless transceiver chip U9 generates a low level, the ninth 2.4G wireless transceiver chip U9 is awakened, when the timer overflows, and the number of pulses is not 0, the ninth 2.4G wireless transceiver chip U9 sends the detected number of pulses to the receiving display circuit. Compared with the prior art, the invention greatly reduces the power consumption of the pulse detection transmitting circuit of the wireless code table, improves the reliability of the wireless code table and the like.
In this embodiment, the first antenna matching circuit 112 includes a first hundred-fifteenth capacitor C115, a first hundred-twentieth capacitor C120, a first hundred-eleventh inductor L111 and a second antenna ANT2, wherein one end of the first hundred-fifteenth capacitor C115 is connected to the seventh pin of the ninth 2.4G wireless transceiver chip U9, the other end of the first hundred-fifteenth capacitor C115 is connected to one end of the first hundred-eleventh inductor L111, the other end of the first hundred-eleventh inductor L111 is connected to one end of the first hundred-twentieth capacitor C120 and one end of the second antenna ANT2, and the other end of the first hundred-twentieth capacitor C120 and the other end of the second antenna ANT2 are grounded. And the twenty-seventh pin, the twenty-eighth pin, the twenty-ninth pin and the thirty-eighth pin of the ninth 2.4G wireless transceiver chip U9 are all connected with the online burning test point.
In this embodiment, the power circuit 110 includes a button cell BT2 and a one hundred eleventh capacitor C111, and in this embodiment, the first low voltage reset circuit 111 includes a tenth low voltage reset chip U10 and a one hundred thirteenth resistor R113, the other pin of the ninth 2.4G wireless transceiving chip U9 is a tenth pin, one end of the button battery BT2 and one end of the first hundred eleventh capacitor C111 are both grounded, the other end of the button battery BT2 and the other end of the first hundred eleventh capacitor C111 are both connected to the second pin of the tenth low voltage reset chip U10, the first pin of the tenth low voltage reset chip U10 is grounded, the second pin of the tenth low voltage reset chip U10 is also connected to one end of the first hundred thirteenth resistor R113 and the power input pins VDDPA and VCCRF of the ninth 2.4G wireless transceiving chip U9, respectively, and the other end of the first hundred thirteenth resistor R113 is connected to the third pin of the tenth low voltage reset chip U10 and the twenty-first pin of the ninth 2.4G wireless transceiving chip U9, respectively. The tenth low voltage reset chip U10 is a 2.2V low voltage reset chip, and when the voltage of the button battery BT2 is lower than 2.2V, the tenth low voltage reset chip U10 outputs a low level to reset the ninth 2.4G wireless transceiver chip U9.
In some cases of this embodiment, the pulse detection transmit circuit may be further extended, for example: the pulse detection transmitting circuit may further include a first crystal oscillation circuit 113, an LED status display circuit 114, a pairing key detection pin 115, and the like.
In this embodiment, the receiving and displaying circuit includes a voltage-reducing circuit 210, a second low-voltage reset circuit 211, a 2.4GHz receiving circuit, a bluetooth audio interface circuit 212, a dial stepper motor J1, an LCD driving and displaying circuit 213, and an LCD driving and selecting circuit 214, and fig. 2 is a schematic circuit diagram of the 2.4GHz receiving circuit in this embodiment; FIG. 3 is a schematic circuit diagram of a voltage reduction circuit and a second low voltage reset circuit in the present embodiment; FIG. 4 is a schematic circuit diagram of a Bluetooth audio interface circuit in this embodiment; FIG. 5 is a schematic circuit diagram of an LCD driver selection circuit according to the present embodiment; FIG. 6 is a schematic circuit diagram of an LCD driving circuit according to the present embodiment; fig. 7 is a schematic circuit diagram of the dial stepping motor in this embodiment.
In this embodiment, the 2.4GHz receiving circuit includes a seventh 2.4GHz wireless transceiving chip U7 and a second antenna matching circuit 217, the second antenna matching circuit 217 includes a first antenna ANT1, a fifth capacitor C5, a twenty-sixth capacitor C26 and a fourth inductor L4, a thirteenth pin of the seventh 2.4GHz wireless transceiving chip U7 is connected to one end of the fifth capacitor C5 and one end of the twenty-sixth capacitor C26 respectively through a fourth inductor L4, the other end of the twenty-sixth capacitor C26 is grounded, the other end of the fifth capacitor C5 is connected to one end of the first antenna ANT1, the other end of the first antenna ANT1 is grounded, the voltage dropping circuit 210 is connected to the second low voltage reset circuit 211, the second low voltage reset circuit 211 is further connected to the seventh 2.4GHz wireless transceiving chip U7, the Bluetooth audio interface circuit 212, the dial stepping motor J1, the LCD driving display circuit 213 and the LCD driving selection circuit 214 are all connected with the seventh 2.4GHz wireless transceiving chip U7.
As shown in fig. 3, in this embodiment, the voltage dropping circuit 210 includes a first voltage dropping chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, an eleventh capacitor C11 and a twelfth capacitor C12, the voltage dropping circuit 210 drops the voltage of the lithium battery to 3V, the first voltage dropping chip U1 is a 3V voltage dropping chip, the second low voltage reset circuit 211 includes a first low voltage reset chip Q1 and a twelfth resistor R12, the first low voltage reset chip Q1 is a 2.2V low voltage reset chip, and when the voltage of the lithium battery is lower than 2.2V, the first low voltage reset chip Q1 outputs a low level to reset the U7. And a twenty-seventh pin of the seventh 2.4GHz wireless transceiving chip U7 has an ADC function, and forms a lithium battery voltage detection circuit together with the thirteenth resistor R13 and the twenty-fourth resistor R24.
In this embodiment, a first pin of the first buck chip U1 is connected to one end of the first capacitor C1 and one end of the second capacitor C2, the other end of the first capacitor C1 and the other end of the second capacitor C2 are both grounded, a first pin of the first buck chip U1 is further connected to a third pin thereof, a second pin of the first buck chip U1 is grounded, a fourth pin of the first buck chip U1 is grounded via the third capacitor C3, a fifth pin of the first buck chip U1 is connected to one end of the eleventh capacitor C11 and one end of the twelfth capacitor C12, a first pin of the first low-voltage reset chip Q1 is connected to a thirty-third pin of the seventh 2.4GHz wireless transceiver chip U7 and one end of the twelfth resistor R12, a second pin of the first low-voltage reset chip Q1 is grounded, and a third pin of the first low-voltage reset chip Q1 is connected to the other end of the twelfth resistor R12 and the fifth buck chip U1.
As shown in fig. 4, the bluetooth audio interface circuit 212 includes a bluetooth audio interface J3, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a seventh resistor R7, a tenth resistor R10, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, and a thirty-first resistor R31, where the first pin, the ninth pin, and the twelfth pin of the bluetooth audio interface J3 are connected, the third pin of the bluetooth audio interface J3 is connected to one end of the tenth resistor R10 and the forty-ninth pin of the seventh 2.4GHz wtru 7 through the sixth resistor R6, and the eighth pin of the bluetooth audio interface J3 is connected to the seventh pin of the seventh 2.4GHz wtru 7 through the thirty-first resistor R31. The sixth resistor R6 and the tenth resistor R10 constitute a 5V charging power supply detection circuit, and when the 5V plug-in power supply is detected, the charging power supply is at a high level.
The thirteenth pin of the bluetooth audio interface J3 is connected to the twenty-sixth pin of the seventh 2.4GHz wireless transceiving chip U7 through the third resistor R3, the fourteenth pin of the bluetooth audio interface J3 is connected to the fifty-sixth pin of the seventh 2.4GHz wireless transceiving chip U7 through the fourth resistor R4, the fifteenth pin of the bluetooth audio interface J3 is connected to the fifty-fifth pin of the seventh 2.4GHz wireless transceiving chip U7 through the seventh resistor R7, the eighteenth pin of the bluetooth audio interface J3 is connected to the fifty-second pin of the seventh 2.4GHz wireless transceiving chip U7 through the twenty-first resistor R21, the nineteenth pin of the bluetooth audio interface J3 is connected to the first pin of the seventh 2.4GHz wireless transceiving chip U7 through the twenty-second resistor R22, and the twentieth pin of the bluetooth audio interface J3 is connected to the seventeenth pin of the seventh 2.4GHz wireless transceiving chip U7 through the thirteenth resistor R23.
The second pin, the fourth pin and the fifth pin of the Bluetooth audio interface J3 are control pins of a Bluetooth audio IC control LCD drive IC, the seventh pin of the Bluetooth audio interface J3 is a Bluetooth audio IC sleep mode detection pin, the eighth pin of the Bluetooth audio interface J3 is a flashlight LED drive control pin, the thirteenth pin of the Bluetooth audio interface J3 is a charging state detection pin, the high level is fully charged, and the low level is in charging; the fourteenth pin, the fifteenth pin, the sixteenth pin, the seventeenth pin, the eighteenth pin and the nineteenth pin of the bluetooth audio interface J3 are bluetooth audio key pins, and the twentieth pin of the bluetooth audio interface J3 is a bluetooth audio IC power supply control pin.
As shown in fig. 5, the LCD driving selection circuit 214 includes a fifth analog switch U5, a sixth analog switch U6, an eighth analog switch U8, an eighth capacitor C8, a ninth capacitor C9, a first resistor R1, a second resistor R2, and a fourth transistor Q4, and the fifth analog switch U5, the sixth analog switch U6, and the eighth analog switch U8 are used to implement the function of independent display of the LCD in two modes of the 2.4GHz wireless code table circuit. A first pin of a fifth analog switch U5 is connected with an eighth pin of a seventh 2.4GHz wireless transceiving chip U7, a second pin of the fifth analog switch U5, a second pin of the sixth analog switch U6 and a second pin of the eighth analog switch U8 are all grounded, a third pin of the fifth analog switch U5 is connected with a second pin of a Bluetooth audio interface J3, a fifth pin of the fifth analog switch U5, a fifth pin of the sixth analog switch U6 and a fifth pin of the eighth analog switch U8 are respectively connected with one end of an eighth capacitor C8 and one end of a ninth capacitor C9, the other end of the eighth capacitor C8 and the other end of the ninth capacitor C9 are all grounded, a sixth pin of the fifth analog switch U5, a sixth pin of the sixth analog switch and a sixth pin of the eighth analog switch U3983 are all connected with a collector of a fourth Q4, a seventh pin of the sixth analog switch U6 is connected with a ninth pin of the seventh 2.4GHz wireless transceiving chip U7, a third pin of the sixth analog switch U6 is connected to a fourth pin of the bluetooth audio interface J3, a first pin of the eighth analog switch U8 is connected to a tenth pin of the seventh 2.4GHz wireless transceiving chip U7, a third pin of the eighth analog switch U8 is connected to a fifth pin of the bluetooth audio interface J3, a collector of the fourth triode Q4 is further connected to the second resistor R2, a base of the fourth triode Q4 is connected to a twenty-ninth pin of the seventh 2.4GHz wireless transceiving chip U7 through the first resistor R1, and an emitter of the fourth triode Q4 is grounded.
When SW _ EN _ BK in fig. 5 outputs 0, the seventh 2.4GHz wireless transceiver chip U7 controls the LCD driver display circuit 213 to display; when SW _ EN _ BK outputs 1, the bluetooth audio IC controls the LCD driver display circuit 213 to display.
As shown in fig. 6, the LCD driver display circuit 213 includes an LCD driver chip U2, an LCD screen J2, a ninth resistor R9, a seventh capacitor C7 and a sixteenth capacitor C16, wherein the first pin, the second pin, the third pin, the fourth pin, the fifth pin, the sixth pin, the seventh pin and the eighth pin of the LCD driver chip U2 are respectively connected to the twelfth pin, the eleventh pin, the ninth pin, the eighth pin, the seventh pin, the sixth pin and the fifth pin of the LCD screen J2, the ninth pin of the LCD driver chip U2 is connected to the fourth pin of the fifth analog switch U5, the eleventh pin of the LCD driver chip U2 is connected to the fourth pin of the sixth analog switch U6, the twelfth pin of the LCD driver chip U2 is connected to the fourth pin of the eighth analog switch U8, the sixteenth pin of the LCD driver chip U2 is connected to the sixteenth capacitor C16 at the ninth end of the ninth capacitor C7 and the sixteenth capacitor C16 through the sixth resistor R9, the other end of the seventh capacitor C7 and the other end of the sixteenth capacitor C16 are both grounded.
The twenty-first pin, the twenty-second pin, the twenty-third pin and the twentieth pin of the LCD driver chip U2 are respectively and correspondingly connected with the first pin, the second pin, the third pin and the fourth pin of the LCD screen J2, and the forty-first pin, the forty-second pin, the forty-third pin, the forty-fourth pin, the forty-fifth pin, the forty-sixth pin, the forty-seventh pin and the forty-eighth pin of the LCD driver chip U2 are respectively and correspondingly connected with the twentieth pin, the nineteenth pin, the eighteenth pin, the seventeenth pin, the sixteenth pin, the fifteenth pin, the fourteenth pin and the thirteenth pin of the LCD screen J2.
When the seventeenth pin of the seventh 2.4GHz wireless transceiver chip U7 outputs a low level, the seventh 2.4GHz wireless transceiver chip U7 is responsible for initializing the LCD driver chip U2 and displaying LCD, and when the seventeenth pin of the seventh 2.4GHz wireless transceiver chip U7 outputs a high level, the LCD screen J2 is responsible for displaying LCD.
Fig. 7 is a schematic circuit diagram of the dial stepping motor in this embodiment. In this embodiment, a first pin of the dial stepper motor J1 is connected to a twenty-third pin, a twenty-fourth pin, and a twenty-fifth pin of the seventh 2.4GHz wireless transceiver chip U7, a second pin of the dial stepper motor J1 is connected to a twentieth pin, a twenty-first pin, and a twenty-second pin of the seventh 2.4GHz wireless transceiver chip U7, a third pin of the dial stepper motor J1 is connected to a thirty-fourth pin, a thirty-fifth pin, and a thirty-sixth pin of the seventh 2.4GHz wireless transceiver chip U7, and a fourth pin of the dial stepper motor J1 is connected to a seventeenth pin, an eighteenth pin, and a nineteenth pin of the seventh 2.4GHz wireless transceiver chip U7. In this embodiment, the IO port of the seventh 2.4GHz wireless transceiver chip U7 directly drives the dial plate stepping motor J1, and in order to satisfy the drive current of the dial plate stepping motor J1, each line uses 3 IO ports for direct drive.
In this embodiment, the receiving and displaying circuit further includes an instrument panel LED driving circuit, and fig. 8 is a schematic circuit diagram of the instrument panel LED driving circuit in this embodiment. In fig. 8, the instrument panel LED driving circuit includes a third triode Q3, a twenty-eighth resistor R28, a twenty-ninth resistor R29, and a thirty-ninth resistor R30, a base of the third triode Q3 is connected to a forty-th pin of the seventh 2.4GHz wireless transceiver chip U7 through a twenty-eighteenth resistor R28, a collector of the third triode Q3 is connected to a sixth pin of the dial stepper motor J1, one end of the thirty-fifth resistor R30 is connected to a fifth pin of the dial stepper motor J1, and the other end of the thirty-fifth resistor R30 is connected to the twenty-ninth resistor R29.
In some cases of this embodiment, the receiving and displaying circuit may be further expanded, for example: the receiving display circuit may further include an LCD backlight driving circuit 216, an LCD backlight driving circuit 218, an online burn test point, and the like. FIG. 9 is a schematic circuit diagram of an LCD backlight driving circuit according to the present embodiment; fig. 10 is a schematic circuit diagram of a second crystal oscillation circuit in the present embodiment; fig. 11 is a schematic diagram of an online burning test point in the present embodiment.
In summary, in this embodiment, the ninth 2.4G wireless transceiver chip U9 detects the number of pulses of the pulse detection interrupt pin P10 and sends the detected number of pulses to the seventh 2.4GHz wireless transceiver chip U7 of the receiving and displaying circuit, the seventh 2.4GHz wireless transceiver chip U7 displays the instant speed, mileage, total mileage, riding time and average speed calculated by the software through the LCD screen J2, and simultaneously displays the instant speed through the dashboard. On the basis of realizing the function of the wireless code table and ensuring the reliability of the wireless code table, the invention optimizes the pulse detection transmitting circuit of the wireless code table, reduces the power consumption of the wireless code table, improves the speed detection range and improves the reliability of the wireless code table.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (7)
1. The 2.4GHz wireless code meter circuit is characterized by comprising a pulse detection transmitting circuit and a receiving display circuit, wherein the pulse detection transmitting circuit comprises a power supply circuit, a first low-voltage reset circuit, a pulse detection circuit and a 2.4GHz wireless transmitting circuit, the 2.4GHz wireless transmitting circuit comprises a ninth 2.4G wireless transceiving chip and a first antenna matching circuit, the pulse detection circuit comprises a reed pipe, a pulse detection interruption pin of the ninth 2.4G wireless transceiving chip is grounded through the reed pipe, when a magnet is in a detection distance range of the reed pipe, the inside of the reed pipe is conducted, when the magnet is out of the detection distance range of the reed pipe, the inside of the reed pipe is open, a timer is arranged in the ninth 2.4G wireless transceiving chip, and when the timer overflows, the ninth 2.4G wireless transceiving chip sends the number of detected pulses to the receiving display circuit through the first antenna matching circuit The power supply circuit is connected with one end of the first low-voltage reset circuit, and the other end of the first low-voltage reset circuit is connected with a power supply input pin of the ninth 2.4G wireless transceiver chip;
the programmable input and output function of the pulse detection interrupt pin of the ninth 2.4G wireless transceiver chip can enable the external interrupt function and the internal programmable pull-up function when the input is set;
when a tire stops, if a magnet stops in the detection distance range of a reed switch, the interior of the reed switch is always conducted, a pulse detection interrupt pin of a ninth 2.4G wireless transceiver chip is always short-circuited to the ground, at the moment, if the ninth 2.4G wireless transceiver chip directly enters the dormancy state, the power consumption of the wireless transceiver chip is very high, the pulse detection interrupt pin needs to be set to be an output low level before the wireless transceiver chip enters the dormancy state, the ninth 2.4G wireless transceiver chip periodically wakes up to detect whether the pulse detection interrupt pin is the low level or not by turning on a timer wake-up function, if the pulse detection interrupt pin is not the low level, the wireless transceiver chip is set to be input, the wireless transceiver chip is pulled up to enable an external interrupt function, and the timer wake-up function is turned; if the voltage is low level, the voltage is still set to be low level, the sleep is started, and the cycle is repeated;
when the tire normally rotates, if the magnet is not in the detection distance range of the reed switch, the pulse detection interrupt pin of the ninth 2.4G wireless transceiver chip is at a high level, the ninth 2.4G wireless transceiver chip enters a sleep mode, when the tire rotates and the magnet is in the detection distance range of the reed switch, the interior of the reed switch is conducted, the pulse detection interrupt pin of the ninth 2.4G wireless transceiver chip generates a low level, the ninth 2.4G wireless transceiver chip is awakened, and when the timer overflows and the number of pulses is not 0, the ninth 2.4G wireless transceiver chip sends the detected number of pulses to the receiving display circuit;
the first antenna matching circuit comprises a first hundred-fifteenth capacitor, a first hundred-twenty capacitor, a first hundred-eleventh inductor and a second antenna, wherein one end of the first hundred-fifteenth capacitor is connected with a seventh pin of the ninth 2.4G wireless transceiver chip, the other end of the first hundred-fifteenth capacitor is connected with one end of the first hundred-eleventh inductor, the other end of the first hundred-eleventh inductor is respectively connected with one end of the first hundred-twenty capacitor and one end of the second antenna, and the other end of the first hundred-twenty capacitor and the other end of the second antenna are both grounded;
the power supply circuit comprises a button battery and a first one hundred eleven capacitor, the first low-voltage reset circuit comprises a tenth low-voltage reset chip and a first one hundred thirteen resistor, the other pin of the ninth 2.4G wireless transceiver chip is a tenth pin, one end of the button battery and one end of the first hundred eleventh capacitor are both grounded, the other end of the button cell and the other end of the first one hundred eleven capacitor are both connected with the second pin of the tenth low-voltage reset chip, the first pin of the tenth low-voltage reset chip is grounded, the second pin of the tenth low-voltage reset chip is also respectively connected with one end of the first one hundred and thirteen resistors and the power output pin of the ninth 2.4G wireless transceiver chip, the other end of the first hundred-thirteen resistor is respectively connected with the third pin of the tenth low-voltage reset chip and the twenty-first pin of the ninth 2.4G wireless transceiver chip;
the receiving and displaying circuit comprises a voltage reduction circuit, a second low-voltage reset circuit, a 2.4GHz receiving circuit, a Bluetooth audio interface circuit, a dial plate stepping motor, an LCD driving and displaying circuit and an LCD driving and selecting circuit, the 2.4GHz receiving circuit comprises a seventh 2.4GHz wireless transceiving chip and a second antenna matching circuit, the second antenna matching circuit comprises a first antenna, a fifth capacitor, a twenty-sixth capacitor and a fourth inductor, a thirteenth pin of the seventh 2.4GHz wireless transceiving chip is respectively connected with one end of the fifth capacitor and one end of the twenty-sixth capacitor through the fourth inductor, the other end of the twenty-sixth capacitor is grounded, the other end of the fifth capacitor is connected with one end of the first antenna, the other end of the first antenna is grounded, the voltage reduction circuit is connected with the second low-voltage reset circuit, the second low-voltage reset circuit is further connected with the seventh 2.4GHz wireless transceiving chip, the Bluetooth audio interface circuit, the dial plate stepping motor, the LCD driving display circuit and the LCD driving selection circuit are all connected with the seventh 2.4GHz wireless transceiver chip.
2. The 2.4GHz wireless code table circuit according to claim 1, wherein the voltage-reducing circuit comprises a first voltage-reducing chip, a first capacitor, a second capacitor, a third capacitor, an eleventh capacitor and a twelfth capacitor, the second low-voltage reset circuit comprises a first low-voltage reset chip and a twelfth resistor, a first pin of the first voltage-reducing chip is connected with one end of the first capacitor and one end of the second capacitor respectively, the other end of the first capacitor and the other end of the second capacitor are both grounded, the first pin of the first voltage-reducing chip is further connected with a third pin thereof, a second pin of the first voltage-reducing chip is grounded, a fourth pin of the first voltage-reducing chip is grounded through the third capacitor, a fifth pin of the first voltage-reducing chip is connected with one end of the eleventh capacitor and one end of the twelfth capacitor respectively, and a first pin of the first low-voltage reset chip is connected with a third pin of the seventh 2.4GHz wireless transceiver chip respectively And a thirteenth pin is connected with one end of a twelfth resistor, a second pin of the first low-voltage reset chip is grounded, and a third pin of the first low-voltage reset chip is respectively connected with the other end of the twelfth resistor and a fifth pin of the first voltage reduction chip.
3. The 2.4GHz wireless code table circuit according to claim 1, wherein the Bluetooth audio interface circuit comprises a Bluetooth audio interface, a third resistor, a fourth resistor, a sixth resistor, a seventh resistor, a tenth resistor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor and a thirty-first resistor, the first pin, the ninth pin and the twelfth pin of the Bluetooth audio interface are connected, the third pin of the Bluetooth audio interface is respectively connected with one end of the tenth resistor and the forty-ninth pin of the seventh 2.4GHz wireless transceiver chip through the sixth resistor, the eighth pin of the Bluetooth audio interface is connected with the seventh pin of the seventh 2.4GHz wireless transceiver chip through the thirty-first resistor, the thirteenth pin of the Bluetooth audio interface is connected with the twenty-sixth pin of the seventh 2.4GHz wireless transceiver chip through the third resistor, a fourteenth pin of the bluetooth audio interface is connected with a fifty-sixth pin of the seventh 2.4GHz wireless transceiver chip through the fourth resistor, a fifteenth pin of the bluetooth audio interface is connected with a fifty-fifth pin of the seventh 2.4GHz wireless transceiver chip through the seventh resistor, an eighteenth pin of the bluetooth audio interface is connected with a fifty-second pin of the seventh 2.4GHz wireless transceiver chip through the twenty-first resistor, a nineteenth pin of the bluetooth audio interface is connected with a fifty-first pin of the seventh 2.4GHz wireless transceiver chip through the twenty-second resistor, and a twentieth pin of the bluetooth audio interface is connected with a fifty-fifth pin of the seventh 2.4GHz wireless transceiver chip through the twenty-third resistor.
4. The 2.4GHz wireless code table circuit according to claim 3, wherein the LCD driving selection circuit comprises a fifth analog switch, a sixth analog switch, an eighth capacitor, a ninth capacitor, a first resistor, a second resistor and a fourth triode, a first pin of the fifth analog switch is connected with an eighth pin of the seventh 2.4GHz wireless transceiver chip, a second pin of the fifth analog switch, a second pin of the sixth analog switch and a second pin of the eighth analog switch are all grounded, a third pin of the fifth analog switch is connected with a second pin of the Bluetooth audio interface, a fifth pin of the fifth analog switch, a fifth pin of the sixth analog switch and a fifth pin of the eighth analog switch are all connected with one end of the eighth capacitor and one end of the ninth capacitor, respectively, and the other end of the eighth capacitor and the other end of the ninth capacitor are all grounded, a sixth pin of the fifth analog switch, a sixth pin of the sixth analog switch and a sixth pin of the eighth analog switch are all connected with the collector of the fourth triode, a first pin of the sixth analog switch is connected with a ninth pin of the seventh 2.4GHz wireless transceiver chip, a third pin of the sixth analog switch is connected with a fourth pin of the Bluetooth audio interface, a first pin of the eighth analog switch is connected with a tenth pin of the seventh 2.4GHz wireless transceiver chip, a third pin of the eighth analog switch is connected with a fifth pin of the bluetooth audio interface, a collector of the fourth triode is also connected with the second resistor, the base electrode of the fourth triode is connected with the twenty-ninth pin of the seventh 2.4GHz wireless transceiver chip through the first resistor, and the emitting electrode of the fourth triode is grounded.
5. The 2.4GHz wireless code table circuit according to claim 4, wherein the LCD driving display circuit comprises an LCD driving chip, an LCD screen, a ninth resistor, a seventh capacitor and a sixteenth capacitor, a first pin, a second pin, a third pin, a fourth pin, a fifth pin, a sixth pin, a seventh pin and an eighth pin of the LCD driving chip are respectively and correspondingly connected with a twelfth pin, an eleventh pin, a ninth pin, an eighth pin, a seventh pin, a sixth pin and a fifth pin of the LCD screen, the ninth pin of the LCD driving chip is connected with the fourth pin of the fifth analog switch, the eleventh pin of the LCD driving chip is connected with the fourth pin of the sixth analog switch, the twelfth pin of the LCD driving chip is connected with the fourth pin of the eighth analog switch, and the sixteenth pin of the LCD driving chip is respectively connected with one end of the seventh capacitor and one end of the sixteenth capacitor through the ninth resistor The other end of the seventh capacitor and the other end of the sixteenth capacitor are both grounded, a twenty-first pin, a twenty-second pin, a twenty-third pin and a twentieth pin of the LCD driver chip are respectively and correspondingly connected with a first pin, a second pin, a third pin and a fourth pin of the LCD screen, and a forty-first pin, a forty-second pin, a forty-third pin, a forty-fourth pin, a forty-fifth pin, a forty-sixth pin, a forty-seventh pin and a forty-eighth pin of the LCD driver chip are respectively and correspondingly connected with a twentieth pin, a nineteenth pin, an eighteenth pin, a seventeenth pin, a sixteenth pin, a fifteenth pin, a fourteenth pin and a thirteenth pin of the LCD screen.
6. The 2.4GHz wireless code table circuit according to claim 1, characterized in that the first pin of the dial stepper motor is connected with the twenty-third, twenty-fourth and twenty-fifth pins of the seventh 2.4GHz wireless transceiver chip, the second pin of the dial stepper motor is connected with the twentieth, twenty-first and twenty-second pins of the seventh 2.4GHz wireless transceiver chip, the third pin of the dial stepper motor is connected with the thirty-fourth, thirty-fifth and thirty-sixth pins of the seventh 2.4GHz wireless transceiver chip, and the fourth pin of the dial stepper motor is connected with the seventeenth, eighteenth and nineteenth pins of the seventh 2.4GHz wireless transceiver chip.
7. The 2.4GHz wireless code table circuit according to claim 6, wherein the receiving and displaying circuit further comprises a meter panel LED driving circuit, the meter panel LED driving circuit comprises a third triode, a twenty-eighth resistor, a twenty-ninth resistor and a thirty-ninth resistor, a base of the third triode is connected with a forty-th pin of the seventh 2.4GHz wireless transceiver chip through the twenty-eighth resistor, a collector of the third triode is connected with a sixth pin of the dial plate stepping motor, one end of the thirty-fifth resistor is connected with a fifth pin of the dial plate stepping motor, and the other end of the thirty-fifth resistor is connected with the twenty-ninth resistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/101033 WO2018058504A1 (en) | 2016-09-30 | 2016-09-30 | 2.4ghz wireless code table circuit |
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| CN107438768A CN107438768A (en) | 2017-12-05 |
| CN107438768B true CN107438768B (en) | 2020-05-19 |
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| CN109473828A (en) * | 2018-12-20 | 2019-03-15 | 苏州小蓝医疗科技有限公司 | A kind of multifunction conjunction and electrocardiogram recording instrument |
| CN109444456A (en) * | 2019-01-07 | 2019-03-08 | 苏州寻息电子科技有限公司 | A kind of beacon for vehicle speed measuring |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3319050B2 (en) * | 1993-06-29 | 2002-08-26 | カシオ計算機株式会社 | Running condition detection device |
| US6192300B1 (en) * | 1997-06-27 | 2001-02-20 | Echowell Electronic Ltd. | Bicycle computer |
| JP2002281691A (en) * | 2001-03-22 | 2002-09-27 | Shimano Inc | Circuit for charging bicycle and detecting its speed |
| US20090088934A1 (en) * | 2007-09-28 | 2009-04-02 | Shimano Inc. | Bicycle control system |
| CN101436095A (en) * | 2007-11-13 | 2009-05-20 | 无锡华润矽科微电子有限公司 | Low voltage resetting method for microcontroller |
| CN101975868B (en) * | 2010-08-23 | 2012-07-11 | 大连交通大学 | Velocity measurement system of track bicycle |
| CN102322871A (en) * | 2011-06-10 | 2012-01-18 | 凯得爱依安全运动器材(太仓)有限公司 | Miniature code table |
| CN102841553A (en) * | 2011-06-24 | 2012-12-26 | 肖瑶 | Application of singlechip control technology in automatic feeding system |
| CN202793405U (en) * | 2012-07-13 | 2013-03-13 | 四川奥格科技有限公司 | Solar bicycle speed meter with wired and wireless ports |
| CN202868766U (en) * | 2012-08-09 | 2013-04-10 | 广东欧派家居集团有限公司 | Gas stove timing device and gas cooker |
| CN104061942A (en) * | 2013-03-20 | 2014-09-24 | 徐筱 | Bluetooth transmission, reception and display apparatus for speeds |
| CN104043225B (en) * | 2014-06-09 | 2016-08-17 | 深圳二十一天健康科技有限公司 | A kind of intelligent body-building bicycle system based on bluetooth |
| CN206096170U (en) * | 2016-09-30 | 2017-04-12 | 深圳博芯科技股份有限公司 | 2. 4GHz wireless code table circuit |
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