CN202453108U - Simple temperature measurement circuit - Google Patents
Simple temperature measurement circuit Download PDFInfo
- Publication number
- CN202453108U CN202453108U CN2011205304700U CN201120530470U CN202453108U CN 202453108 U CN202453108 U CN 202453108U CN 2011205304700 U CN2011205304700 U CN 2011205304700U CN 201120530470 U CN201120530470 U CN 201120530470U CN 202453108 U CN202453108 U CN 202453108U
- Authority
- CN
- China
- Prior art keywords
- thermistor
- sampling resistor
- temperature
- mcu
- light emitting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Control Of El Displays (AREA)
Abstract
The utility model discloses a simple temperature measurement circuit, which is characterized by being provided with at least one thermistor R1/R2/R3 and one sampling resistor R4, wherein the thermistor R1/R2/R3 and the sampling resistor R4 are serially connected between the anode and the cathode of a power supply, and the low level end of the sampling resistor R4 is connected with the cathode of the power supply, the high level end of the sampling resistor R4 is connected with one input end of an MCU (Microprogrammed Control Unit), and a temperature display circuit is also connected with an output end group of the MCU. The simple temperature measurement circuit disclosed by the utility model has the beneficial effects that the MCU is taken as a control unit, the thermistor senses the temperature change, the temperature level is displayed by a light emitting diode, the equipment is simple, the electric consumption is low, the cost is low, the installation and debugging are convenient, and the requirements on basic daily life application can be satisfied with the low detection precision.
Description
Technical field
The utility model relates to temperature sensor technology, specifically, is a kind of simple and easy temperature measurement circuit that utilizes thermistor to constitute.
Background technology
Along with science and technology development, the application of temperature sensor technology also more and more widely, people hope to get information about very much the temperature value of surrounding enviroment or object, therefore, temperature sensor arises at the historic moment.At present common on the market temperature sensor detects accurately high, often is applied in industrial circle, and price is also relatively more expensive.And existing temperature sensor often has two kinds, and a kind of is to adopt thermopair, is mainly used in the temperature detection of liquid article, and another kind is to adopt thermistor, and solid-state article or surrounding enviroment are carried out temperature detection.
In the prior art, the ratio of precision that all temps pick-up unit is provided with is higher, and cost is somewhat expensive, and the installation of equipment and debug cumbersomely there is no need the simple application in daily life.
The utility model content
The purpose of the utility model provides a kind of easy temperature measurement circuit, utilizes thermistor technology and singlechip technology, makes it demonstrate temperature range intuitively, satisfies the simple application in the daily life.
For realizing above-mentioned purpose, the technical scheme that the utility model adopted is following:
A kind of simple and easy temperature measurement circuit; Its key is: be provided with at least one thermistor R1/R2/R3 and a sampling resistor R4; Said thermistor R1/R2/R3 and sampling resistor R4 are serially connected between the positive and negative electrode of power supply; And the low level termination power cathode of sampling resistor R4, the input end of the high level termination MCU of sampling resistor R4 also is connected with temperature display circuit on the output terminal group of MCU.
Because the resistance of thermistor R1/R2/R3 changes with the variation of environment temperature; Make that the electric current that flows through in the different temperatures down-sampling resistance R 4 is different; Detect the partial pressure value of sampling resistor R4 through MCU; Both decidable went out the temperature value of current environment, and under different temperatures value situation, MCU can show the different temperature state on temperature display circuit.
As further describing; Said temperature display circuit is made up of current-limiting resistance R5 and five light emitting diode D1～D5; Wherein the termination power of current-limiting resistance R5 is anodal; The other end of current-limiting resistance R5 links to each other with the positive pole of five light emitting diode D1～D5 respectively, and the negative pole of said five light emitting diode D1～D5 is connected on the power cathode, and the positive pole of every light emitting diode D1～D5 also is connected with the road output terminal of MCU.
Said five light emitting diode D1～D5 from top to down successively and come in the display box of 5 temperature grades.
Utilize the demonstration of light emitting diode, under the different temperatures scope, light the light emitting diode of varying number as temperature grade, not only directly perceived, and also with low cost, control also more convenient.
In order to increase the temperature-sensitive scope, said thermistor R1/R2/R3 is in series by the first thermistor R1, the second thermistor R2 and the 3rd thermistor R3.
The remarkable result of the utility model is: utilize MCU as control module, through the variation of thermistor temperature sensor, through the grade of diode displaying temperature; Equipment is simpler and easy; Power consumption is low, and cost is low, installs and debug more convenient; Though accuracy of detection is low, satisfies daily life basically and use.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model;
Fig. 2 is the structural representation of the utility model temperature display module.
Embodiment
Below will be with reference to accompanying drawing, the specific embodiment of the utility model is carried out detailed description.
As shown in Figure 1; A kind of simple and easy temperature measurement circuit; Be provided with at least one thermistor R1/R2/R3 and a sampling resistor R4, in order to increase the temperature-sensitive scope, thermistor R1/R2/R3 is in series by the first thermistor R1, the second thermistor R2 and the 3rd thermistor R3.
Said thermistor R1, R2, R3 and sampling resistor R4 are serially connected between the positive and negative electrode of power supply; And the low level termination power cathode of sampling resistor R4; The input end of the high level termination MCU of sampling resistor R4 also is connected with temperature display circuit on the output terminal group of MCU.
In the implementation process; Said temperature display circuit is made up of current-limiting resistance R5 and five light emitting diode D1～D5; Wherein the termination power of current-limiting resistance R5 is anodal; The other end of current-limiting resistance R5 links to each other with the positive pole of five light emitting diode D1～D5 respectively, and the negative pole of said five light emitting diode D1～D5 is connected on the power cathode, and the positive pole of every light emitting diode D1～D5 also is connected with the road output terminal of MCU.
As shown in Figure 2, said five light emitting diode D1～D5 from top to down successively and come in the display box of 5 temperature grades.
The principle of work of the utility model is:
Utilize the sensitive characteristic of thermistor R1/R2/R3; Its resistance is changed with the variation of environment temperature; Thereby the electric current that under different temperatures, causes flowing through among the sampling resistor R4 is different, detects the partial pressure value of sampling resistor R4 through MCU, and both decidable went out the temperature value of current environment.
Through the luminance of each diode of MCU control, MCU can adopt 51 single-chip microcomputers or other microcontroller chips, with five light emitting diode D1～D5 from top to down successively and come in the display box of 5 temperature grades; Display box acceptance of the bid in each temperature grade is marked with 30 °～70 ° of temperature values, if detected temperatures is lower than 30 °, then diode is all not luminous; If temperature is between 30 °～40 °; Then the 5th diode D5 is luminous, if temperature is between 40 °～50 °, then the 4th diode D4 and the 5th diode D5 are simultaneously luminous; By that analogy; If temperature is higher than 70 °, then five light emitting diode D1～D5 are all luminous, thereby satisfy the simple application in the daily life.
Claims (4)
1. simple and easy temperature measurement circuit; It is characterized in that: be provided with at least one thermistor R1/R2/R3 and a sampling resistor R4; Said thermistor R1/R2/R3 and sampling resistor R4 are serially connected between the positive and negative electrode of power supply; And the low level termination power cathode of sampling resistor R4, the input end of the high level termination MCU of sampling resistor R4 also is connected with temperature display circuit on the output terminal group of MCU.
2. a kind of simple and easy temperature measurement circuit according to claim 1; It is characterized in that: said temperature display circuit is made up of current-limiting resistance R5 and five light emitting diode D1～D5; Wherein the termination power of current-limiting resistance R5 is anodal; The other end of current-limiting resistance R5 links to each other with the positive pole of five light emitting diode D1～D5 respectively, and the negative pole of said five light emitting diode D1～D5 is connected on the power cathode, and the positive pole of every light emitting diode D1～D5 also is connected with the road output terminal of MCU.
3. a kind of simple and easy temperature measurement circuit according to claim 2 is characterized in that: said five light emitting diode D1～D5 from top to down successively and come in the display box of 5 temperature grades.
4. a kind of simple and easy temperature measurement circuit according to claim 1 is characterized in that: said thermistor R1/R2/R3 is in series by the first thermistor R1, the second thermistor R2 and the 3rd thermistor R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205304700U CN202453108U (en) | 2011-12-16 | 2011-12-16 | Simple temperature measurement circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205304700U CN202453108U (en) | 2011-12-16 | 2011-12-16 | Simple temperature measurement circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202453108U true CN202453108U (en) | 2012-09-26 |
Family
ID=46868963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205304700U Expired - Fee Related CN202453108U (en) | 2011-12-16 | 2011-12-16 | Simple temperature measurement circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202453108U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754806A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit |
| CN104754813A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit and flashlight |
-
2011
- 2011-12-16 CN CN2011205304700U patent/CN202453108U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104754806A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit |
| CN104754813A (en) * | 2013-12-31 | 2015-07-01 | 海洋王（东莞）照明科技有限公司 | Detection circuit and flashlight |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203164326U (en) | Digital display type detection device of resistor strain sensor | |
| CN203037360U (en) | Intelligent temperature measuring instrument | |
| CN204086357U (en) | A kind of multimeter assistant voice report latch device | |
| CN202394744U (en) | Circuit and terminal capable of indicating key states through LED (light-emitting diode) lamps | |
| CN202453108U (en) | Simple temperature measurement circuit | |
| CN203365653U (en) | Low-cost battery electric quantity detection circuit | |
| CN202339330U (en) | Monitor capable of displaying concentration of harmful gas in grading | |
| CN201765302U (en) | Device for detecting performances of Hall integrated circuit | |
| CN102933005A (en) | Circuit for LED constant current power supply | |
| CN202929127U (en) | Circuit for detecting three-phase electricity phase sequence and open phase | |
| CN102062823B (en) | Electric leakage protection device tester | |
| CN204330173U (en) | A kind of easy electronic temperature transmitter | |
| CN202648900U (en) | Leakage detection circuit of heating groove | |
| CN202093141U (en) | Temperature controlling switch detecting circuit and device thereof | |
| CN201654144U (en) | Earth leakage protective device tester | |
| CN203133161U (en) | Light bar power measurement device | |
| CN206490875U (en) | A kind of photoelectric detection system | |
| CN203132577U (en) | U-shaped sensor simple detection device | |
| CN204362389U (en) | A kind of LED emission control device of Novel belt temperature detection | |
| CN203643868U (en) | Water temperature regulating circuit | |
| CN208460165U (en) | A kind of automobile storage battery state-detection alarm | |
| CN205015115U (en) | Novel digital pressure transmitter | |
| CN104101782A (en) | Resistance testing circuit and testing device | |
| CN205301534U (en) | Battery selecting arrangement among extensible series battery | |
| CN203745412U (en) | Corrosive gas detection sensor of circuit board |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120926 Termination date: 20121216 |