CN102853927A - Numeral temperature measuring and displaying system based on singlechip - Google Patents
Numeral temperature measuring and displaying system based on singlechip Download PDFInfo
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- CN102853927A CN102853927A CN201110177315XA CN201110177315A CN102853927A CN 102853927 A CN102853927 A CN 102853927A CN 201110177315X A CN201110177315X A CN 201110177315XA CN 201110177315 A CN201110177315 A CN 201110177315A CN 102853927 A CN102853927 A CN 102853927A
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Abstract
The invention discloses a numeral temperature measuring and displaying system based on a singlechip, which comprises a temperature sensing circuit connected with the singlechip, a temperature control circuit, a keyboard circuit and a display circuit. The temperature sensing circuit is powered by an external power supply, the temperature control circuit sets an upper limit and a lower limit of temperature through a keyboard, the keyboard circuit sets a lower temperature limit through two keys, sets an upper temperature limit through two other keys and achieves temperature setting through adding and decreasing, and the display circuit adopts a liquid crystal display as a display device. By means of the system of the numeral temperature measuring and displaying system based on the singlechip a controller adopts a singlechip AT89S51, a temperature sensor adopts DS18B20, and the display circuit adopts an LCD1602 liquid crystal display. The system can conveniently achieve collecting and displaying of temperature, upper limits and lower limits setting, and temperature controlling, and is convenient to use and suitable for daily lives and temperature measuring and controlling in industries and agriculture.
Description
Technical field
The present invention relates to circuit field, be specifically related to a kind of SCM Based digital measurement of temperature and display system.
Background technology
Temperature is the physical quantity of and people's living environment close relation, and also being needs the important physical amount measuring and control in a kind of production, scientific research, the life.The variation meeting of temperature brings great change to our life, work, production, so the measurement of temperature and control are vital.Along with the development of modern computer and automatic technology, temperature is the controlled parameter of commonly using in industrial and agricultural production, becomes current main flow and adopt single-chip microcomputer to come these controlled parameters are controlled.
Summary of the invention
The object of the present invention is to provide a kind of SCM Based digital measurement of temperature and display system.
In order to solve the problems of the technologies described above, realize above-mentioned purpose, the present invention has adopted following technical scheme:
A kind of SCM Based digital measurement of temperature and display system comprise single-chip microcomputer, the temperature sensing circuit that links to each other with single-chip microcomputer, temperature-control circuit, and keyboard circuit and display circuit,
Temperature sensing circuit adopts the external power source mode, and temperature sensor is linked to each other with single-chip microcomputer, and connect a pull-up resistor,
The bound of temperature-control circuit by the keyboard to set up temperature compares the temperature bound of the temperature of actual measurement and setting, controls wherein three and couples together high-low level for the port of control temperature and warning with the base stage of triode respectively;
Keyboard circuit with two key assignments lowest temperatures, is used two key assignments upper temperature limits again, realizes the setting of temperature by the increase and decrease function key;
Display circuit, as display device, the voltage of the vdd terminal of its integrated circuit is the voltage of 5V with liquid crystal display, the driving voltage of VEE end is connected with slide rheostat by the potentiometer adjustment of a 10K, and with being connected of single-chip microcomputer.
Preferably, the resistance of described pull-up resistor is 4.7K.
Preferably, in the described display circuit, a precondition of the work of display is to make VEE below 0.7 volt by slide rheostat.
The present invention has the following advantages: hardware circuit of the present invention mainly comprises master controller, temperature measurement circuit, temperature control circuit and display circuit etc., controller adopts single chip computer AT 89S51, temperature sensor adopts DS18B20, display circuit adopts the LCD1602 liquid crystal display, this system can realize collection and the demonstration of temperature easily, and the Set arbitrarily bound is reported to the police and the control temperature as required, very convenient to use, be suitable for the temperature measure and control in our daily life and the industrial or agricultural, it can be real-time demonstration and design temperature, realize the automatic control to temperature.The combination of DS18B20 and AT89S51 realizes the simplest system for detecting temperature, and this system architecture is simple, and antijamming capability is strong, is suitable for being fit to carrying out under the rugged surroundings scene temperature and measures, and has wide practical use.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of instructions, below is described in detail as follows with preferred embodiment of the present invention.The specific embodiment of the present invention is provided in detail by following examples.
Embodiment
A kind of SCM Based digital measurement of temperature and display system comprise single-chip microcomputer, the temperature sensing circuit that links to each other with single-chip microcomputer, temperature-control circuit, and keyboard circuit and display circuit,
Temperature sensing circuit adopts the external power source mode, and temperature sensor is linked to each other with single-chip microcomputer, and connect a pull-up resistor,
Temperature-control circuit compares the temperature bound of the temperature of actual measurement and setting by the bound of keyboard to set up temperature, controls the high-low level of three ports, and other three ports are connected to control temperature and warning with the base stage of triode respectively;
Keyboard circuit with two key assignments lowest temperatures, is used two key assignments upper temperature limits again, realizes the setting of temperature by the increase and decrease function key;
Display circuit, as display device, the voltage of the vdd terminal of its integrated circuit is the voltage of 5V with liquid crystal display, the driving voltage of VEE end is connected with slide rheostat by the potentiometer adjustment of a 10K, and with being connected of single-chip microcomputer.
Preferably, the resistance of described pull-up resistor is 4.7K.
Preferably, in the described display circuit, a precondition of the work of display is to make VEE below 0.7 volt by slide rheostat.
Embodiment 1
A kind of SCM Based digital measurement of temperature and display system, temperature control system adopt eight machines of AT89S51 to control as microprocessing unit.Adopt stand-alone keypad the mxm. of design temperature and minimum to be deposited in the data-carrier store of single-chip microcomputer.Temperature sensor compares to control temperature to the signal that gathers with the data in the single-chip microcomputer.
Temperature sensor DS18B20 sends to measured temperature on the AT89S51 single-chip microcomputer, processes through 51 single-chip microcomputers, will show temperature at display circuit that the native system display is dot character LCD, 1602 Liquid Crystal Modules.0 degree centigrade to 60 degrees centigrade of sensing range.Native system can also independently arrange a temperature value zone except displays temperature, such as 20 degrees centigrade to 40 degrees centigrade.Measured temperature is monitored, and when temperature was higher or lower than the design temperature zone, (when temperature was higher than the mxm. of design temperature, fan left to begin warning and startup corresponding program; When temperature was lower than the minimum of design temperature, well heater left).
CPU to the browsing process of DS18B20 is: first to the DS18B20 initialization, carry out again the ROM operational order, at last could be to storage operation, and data manipulation.Each step operation of DS18B20 all will be followed strict work schedule and communication protocol.Finish this process of temperature transition such as host computer control DS18B20, communications protocol according to DS18B20, must be through three steps: all will reset to DS18B20 before the read-write each time, send a ROM instruction after resetting successfully, send at last instruction ram, the operation that could be scheduled to DS18B20 like this.
In the temperature-control circuit, by the bound of keyboard to set up temperature.The temperature bound of the temperature of actual measurement and setting is compared, control wherein three and couple together high-low level for the port of control temperature and warning with the base stage of triode respectively.When the temperature of measuring has surpassed the maximum temperature of setting, just be equivalent to base stage and be input as " 0 ", at this moment triode conducting promotes alarm and temperature-control circuit work, and this moment, alarm was also started working.(replacing with a lampet here).Otherwise, when base stage is input as " 1 ", not conducting of triode, alarm and temperature-control circuit are not worked.
In the keyboard circuit, for the setting of temperature bound, only need increase and decrease just can realize the setting of temperature, with two key assignments lowest temperatures, use again two key assignments upper temperature limits.
, in the display circuit on basis, there are 8 data lines to be connected port with main control chip and connect take liquid crystal display device, have 3 control lines to be connected respectively the in addition connection of three ports with main control chip.Add+voltage of 5V that to vdd terminal VSS holds ground connection.The driving voltage of VEE end is not excessive, can by the potentiometer adjustment of a 10K, regulate slide rheostat VEE could be worked at display below 0.7 volt.
Above-described embodiment just is to allow the one of ordinary skilled in the art can understand content of the present invention and according to this enforcement for technical conceive of the present invention and characteristics being described, its objective is, can not limit protection scope of the present invention with this.Variation or the modification of every equivalence that the essence of content has been done according to the present invention all should be encompassed in protection scope of the present invention.
Claims (3)
1. a SCM Based digital measurement of temperature and display system is characterized in that, comprise single-chip microcomputer, the temperature sensing circuit that links to each other with single-chip microcomputer, temperature-control circuit, and keyboard circuit and display circuit,
Temperature sensing circuit adopts the external power source mode, and temperature sensor is linked to each other with single-chip microcomputer, and connect a pull-up resistor,
The bound of temperature-control circuit by the keyboard to set up temperature compares the temperature bound of the temperature of actual measurement and setting, controls wherein three and couples together high-low level for the port of control temperature and warning with the base stage of triode respectively;
Keyboard circuit with two key assignments lowest temperatures, is used two key assignments upper temperature limits again, realizes the setting of temperature by the increase and decrease function key;
Display circuit, as display device, the voltage of the vdd terminal of its integrated circuit is the voltage of 5V with liquid crystal display, the driving voltage of VEE end is connected with slide rheostat by the potentiometer adjustment of a 10K, and with being connected of single-chip microcomputer.
2. according to claims 1 described SCM Based digital measurement of temperature and display system, it is characterized in that the resistance of described pull-up resistor is 4.7K.
3. according to claims 1 described SCM Based digital measurement of temperature and display system, it is characterized in that in the described display circuit, a precondition of the work of display is to make VEE below 0.7 volt by slide rheostat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110177315XA CN102853927A (en) | 2011-06-28 | 2011-06-28 | Numeral temperature measuring and displaying system based on singlechip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110177315XA CN102853927A (en) | 2011-06-28 | 2011-06-28 | Numeral temperature measuring and displaying system based on singlechip |
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| CN102853927A true CN102853927A (en) | 2013-01-02 |
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| CN201110177315XA Pending CN102853927A (en) | 2011-06-28 | 2011-06-28 | Numeral temperature measuring and displaying system based on singlechip |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868606A (en) * | 2012-12-13 | 2014-06-18 | 北京普源精电科技有限公司 | Method and device for monitoring column oven |
| CN104515609A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Temperature control circuit and LED illuminating device |
| CN104655302A (en) * | 2015-01-30 | 2015-05-27 | 蚌埠市佳爱电子有限公司 | Multi-channel real-time temperature measuring instrument for incubation device |
| CN105223988A (en) * | 2015-10-15 | 2016-01-06 | 合肥谢尔网络科技有限公司 | A kind of temperature inspection and control system of warmhouse booth |
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| JPS54134479A (en) * | 1978-04-10 | 1979-10-18 | Sharp Corp | Wireless temperature measuring device |
| US20030214999A1 (en) * | 1999-09-20 | 2003-11-20 | Chapman Peter A. | Wireless remote cooking thermometer system |
| CN201464056U (en) * | 2009-07-20 | 2010-05-12 | 湖南工程学院 | Electronic thermometer |
| CN201508241U (en) * | 2009-08-31 | 2010-06-16 | 比亚迪股份有限公司 | Temperature and humidity detecting alarm |
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| JPS54134479A (en) * | 1978-04-10 | 1979-10-18 | Sharp Corp | Wireless temperature measuring device |
| US20030214999A1 (en) * | 1999-09-20 | 2003-11-20 | Chapman Peter A. | Wireless remote cooking thermometer system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103868606A (en) * | 2012-12-13 | 2014-06-18 | 北京普源精电科技有限公司 | Method and device for monitoring column oven |
| CN104515609A (en) * | 2013-09-26 | 2015-04-15 | 深圳市海洋王照明工程有限公司 | Temperature control circuit and LED illuminating device |
| CN104655302A (en) * | 2015-01-30 | 2015-05-27 | 蚌埠市佳爱电子有限公司 | Multi-channel real-time temperature measuring instrument for incubation device |
| CN105223988A (en) * | 2015-10-15 | 2016-01-06 | 合肥谢尔网络科技有限公司 | A kind of temperature inspection and control system of warmhouse booth |
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