CN110211394A - Display screen deferred mount based on Schmidt trigger - Google Patents
Display screen deferred mount based on Schmidt trigger Download PDFInfo
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- CN110211394A CN110211394A CN201910620802.5A CN201910620802A CN110211394A CN 110211394 A CN110211394 A CN 110211394A CN 201910620802 A CN201910620802 A CN 201910620802A CN 110211394 A CN110211394 A CN 110211394A
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- China
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- schmidt
- module
- time delay
- microcontroller
- schmidt trigger
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- 230000008054 signal transmission Effects 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 16
- 230000003287 optical effect Effects 0.000 claims description 3
- 238000007688 edging Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/07—Controlling traffic signals
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The present invention provides a kind of display screen deferred mount based on Schmidt trigger, comprising: Schmidt's time delay module, microcontroller, signal transmission module, power module；The input terminal of Schmidt's time delay module is used to connect the input control signal of semaphore sending；One input terminal of the output termination microcontroller of Schmidt's time delay module；The input terminal of one output termination signal transmission module of microcontroller, the output end of signal transmission module is for connecing LED display；Power module is for providing electrical power to Schmidt's time delay module, microcontroller, signal transmission module.The cycle time that the delay duration of Schmidt's time delay module is set greater than input control signal when becoming pulse signal.When the present invention realizes signal lamp flashing, program is continuously display on LED display.
Description
Technical field
The present invention relates to a kind of traffic-control unit, especially a kind of display screen delay based on Schmidt trigger
Device.
Background technique
Pedestrains safety is the important component of urban traffic safety, participates in walking present in road traffic for pedestrian
Problem random strong, direction is changeable, it is ensured that pedestrian's street crossing safety, using the combination of pedestrian crosswalk signal lamp and LED display,
Realize that pedestrian's street crossing reminds the function with traffic safety propaganda, to solve the problems, such as pedestrains safety.
Present pedestrian crosswalk signal lamp requires to flash 6 seconds before green light end cycle, and flicker cycle is 250 milliseconds,
In the case where making same signal wire altogether, LED display can also follow flashing.
According to demand, LED display needs kept being always within this time, the case where not increasing independent signal line
Under, it cannot achieve the function of not flashing.
Summary of the invention
It is aobvious based on Schmidt trigger that it is an object of the present invention to overcome the shortcomings of the prior art and provide a kind of
Display screen deferred mount by delay circuit is so that signal in input control signal using the hysteresis phenomenon of Schmidt trigger
When the pulse signal of lamp flashing, the output of output continued for constant level controls signal, so that LED display is continuously display；This hair
It is bright the technical solution adopted is that:
A kind of display screen deferred mount based on Schmidt trigger, comprising: Schmidt's time delay module, microcontroller, signal pass
Defeated module, power module；
The input terminal of Schmidt's time delay module is used to connect the input control signal of semaphore sending；
One input terminal of the output termination microcontroller of Schmidt's time delay module；One output termination signal of microcontroller passes
The input terminal of defeated module, the output end of signal transmission module is for connecing LED display；
Power module is for providing electrical power to Schmidt's time delay module, microcontroller, signal transmission module.
Further, Schmidt's time delay module, when the input control signal received is pulse signal, output one
To microcontroller, microcontroller controls letter to the output of one continued for constant level of output for permanent High level or low level signal
Number, so that display screen is continuously display.
Further, when the delay duration of Schmidt's time delay module is set greater than input control signal and becomes pulse signal
Cycle time.
Further, Schmidt's time delay module includes: Schmidt trigger U1, resistance R1, capacitor C1；
The external capacitive of Schmidt trigger U1/resistance pins one end connecting resistance R1 and the one end capacitor C1, another termination of resistance R1
Positive voltage VCC；The external capacitive pin of Schmidt trigger U1 connect capacitor C1 the other end,；Schmidt trigger U1's is negative
Edging trigger end ground connection, positive edge triggering termination input control signal；
An anti-phase output of Schmidt trigger U1 terminates microcontroller；
For resistance R1 and capacitor C1 for setting delay duration, the delay duration of Schmidt's time delay module is set greater than input control
Signal processed becomes cycle time when pulse signal.
Further, resistance R1 is set as the Europe 300K, and capacitor C1 is set as 2 μ F.
Further, the in-phase output end sending and receiving optical diode D1 anode of Schmidt trigger U1, light emitting diode D1's
Cathode is grounded by resistance R2.
The present invention has the advantages that the present apparatus is kept away when semaphore is with same signal line traffic control signal lamp and LED display
Exempt from signal lamp flashing, the problem of display of LED display also follows flashing；Realize the continuously display of program on display screen.
Detailed description of the invention
Fig. 1 is structure composition schematic diagram of the invention.
Fig. 2 is Schmidt's time delay module schematic diagram of the invention.
Specific embodiment
Below with reference to specific drawings and examples, the invention will be further described.
As shown in Figure 1, the display screen deferred mount proposed by the present invention based on Schmidt trigger, including Schmidt's delay
Module, microcontroller, signal transmission module, power module；
The input terminal of Schmidt's time delay module is used to connect the input control signal of semaphore sending；
One input terminal of the output termination microcontroller of Schmidt's time delay module；One output termination signal of microcontroller passes
The input terminal of defeated module, the output end of signal transmission module is for connecing LED display；
Power module is for providing electrical power to Schmidt's time delay module, microcontroller, signal transmission module；
Schmidt's time delay module, the input control signal received be pulse signal when, export a permanent High level or
Low level signal is to microcontroller, and microcontroller is to export the output control of a continued for constant level (high level or low level)
Signal processed, so that LED display is continuously display；
One example circuit of Schmidt's time delay module is as shown in Figure 2, comprising: Schmidt trigger U1, resistance R1, capacitor C1；
U1 specifically uses 74HC123；
External capacitive/resistance pins (15 foot) one end connecting resistance R1 of Schmidt trigger U1 and the one end capacitor C1, resistance R1 are another
One termination positive voltage VCC；The external capacitive pin (14 foot) of Schmidt trigger U1 connect capacitor C1 the other end,；Schmidt
The negative side of trigger U1 is grounded along triggering end (1 foot), and positive edge triggering end (2 foot) connects input control signal；Wherein VCC is used
3.3v；
A reversed-phase output (4 foot) of Schmidt trigger U1 connects microcontroller；The in-phase output end of Schmidt trigger U1
Sending and receiving optical diode D1 anode, the cathode of light emitting diode D1 are grounded by resistance R2；
For resistance R1 and capacitor C1 for setting delay duration, the delay duration of Schmidt's time delay module is set greater than input control
Signal processed becomes cycle time when pulse signal, such as the delay duration of Schmidt's time delay module is 600ms, is greater than 250ms
The pulse signal cycle time；At this point, resistance R1 can be set as the Europe 300K, capacitor C1 can be set as 2 μ F；
When input control signal is high level, the reversed-phase output (4 foot) of Schmidt trigger U1 exports low level；Work as input
When control signal is changed into pulse signal, a rising edge of pulse signal makes the reversed-phase output (4 of Schmidt trigger U1
Foot) output low level, in delay time 600ms, the positive edge triggering end (2 foot) of U1 detects rising edge signal again, applies
The low level time of the reversed-phase output (4 foot) of schmitt trigger U1 is increased again to 600ms, repeatedly, in signal lamp
Green light flashed in the period, and the reversed-phase output (4 foot) of U1 persistently exports low level；Microcontroller is set as low level triggering, control
The continuously display actual program of LED display processed；
In other embodiments, Schmidt trigger U1 can also be connected into failing edge triggering, export and continue in delay time
High level；Then the negative side of U1 connects input control signal, positive edge triggering end (2 foot) ground connection along triggering end (1 foot)；In-phase output end
(13 foot) connects microcontroller；Microcontroller is set as high level triggering.
It, can be full according to different requirements, by adjusting the value of resistance, capacitor according to crossing actual conditions in actual implementation
The needs of foot difference input control signal.
Finally it should be noted that the above specific embodiment is only used to illustrate the technical scheme of the present invention and not to limit it, to the greatest extent
Pipe is described the invention in detail referring to example, those skilled in the art should understand that, it can be to of the invention
Technical solution is modified or replaced equivalently, and without departing from the spirit and scope of the technical solution of the present invention, should all be covered
In scope of the presently claimed invention.
Claims (6)
1. a kind of display screen deferred mount based on Schmidt trigger characterized by comprising Schmidt's time delay module, micro-
Controller, signal transmission module, power module；
The input terminal of Schmidt's time delay module is used to connect the input control signal of semaphore sending；
One input terminal of the output termination microcontroller of Schmidt's time delay module；One output termination signal of microcontroller passes
The input terminal of defeated module, the output end of signal transmission module is for connecing LED display；
Power module is for providing electrical power to Schmidt's time delay module, microcontroller, signal transmission module.
2. the display screen deferred mount based on Schmidt trigger as described in claim 1, which is characterized in that
Schmidt's time delay module, the input control signal received be pulse signal when, export a permanent High level or
For low level signal to microcontroller, microcontroller controls signal to the output of one continued for constant level of output, so that display
Shield continuously display.
3. the display screen deferred mount based on Schmidt trigger as described in claim 1, which is characterized in that
The cycle time that the delay duration of Schmidt's time delay module is set greater than input control signal when becoming pulse signal.
4. the display screen deferred mount based on Schmidt trigger as described in claim 1, which is characterized in that
Schmidt's time delay module includes: Schmidt trigger U1, resistance R1, capacitor C1；
The external capacitive of Schmidt trigger U1/resistance pins one end connecting resistance R1 and the one end capacitor C1, another termination of resistance R1
Positive voltage VCC；The external capacitive pin of Schmidt trigger U1 connect capacitor C1 the other end,；Schmidt trigger U1's is negative
Edging trigger end ground connection, positive edge triggering termination input control signal；
An anti-phase output of Schmidt trigger U1 terminates microcontroller；
For resistance R1 and capacitor C1 for setting delay duration, the delay duration of Schmidt's time delay module is set greater than input control
Signal processed becomes cycle time when pulse signal.
5. the display screen deferred mount based on Schmidt trigger as claimed in claim 4, which is characterized in that
Resistance R1 is set as the Europe 300K, and capacitor C1 is set as 2 μ F.
6. the display screen deferred mount based on Schmidt trigger as claimed in claim 4, which is characterized in that
The cathode of the in-phase output end sending and receiving optical diode D1 anode of Schmidt trigger U1, light emitting diode D1 passes through resistance R2
Ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620802.5A CN110211394B (en) | 2019-07-10 | 2019-07-10 | Display screen delay device based on Schmitt trigger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910620802.5A CN110211394B (en) | 2019-07-10 | 2019-07-10 | Display screen delay device based on Schmitt trigger |
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| CN110211394A true CN110211394A (en) | 2019-09-06 |
| CN110211394B CN110211394B (en) | 2024-04-12 |
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