CN103090980A

CN103090980A - Temperature display and alarm system based on single-chip microcomputer

Info

Publication number: CN103090980A
Application number: CN201110338905.6A
Authority: CN
Inventors: 钱国东
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-11-01
Filing date: 2011-11-01
Publication date: 2013-05-08

Abstract

The invention discloses a temperature display and alarm system based on a single-chip microcomputer. The temperature display and alarm system based on the single-chip microcomputer comprises a clock module, a temperature sensor, an independent keyboard module, the single-chip microcomputer, a light-emitting diode (LED) alarm display module, an LED screen display module and a buzzer, wherein output ends of the clock module, the temperature sensor and the independent keyboard module are connected with an input end of the single-chip microcomputer, and an output end of the single-chip microcomputer is respectively connected with input ends of the LED alarm display module, the LED screen display module and the buzzer. A system keyboard is used for adjusting time and inquiring temperature, is strong in function, is capable of setting the upper-limit alarm temperature and the lower-limit alarm temperature, is accurate in measurement and is small in error. Compared with a traditional thermometer, the temperature display and alarm system based on the single-chip microcomputer has the advantages that the number is read conveniently, the temperature measurement range is wide, the output temperature is displayed in a digital mode, and the like, and is mainly suitable for occasions requiring accurate temperature measurement such as a research laboratory.

Description

A kind of SCM Based temperature display alarm system

Technical field

The present invention relates to a kind of warning system, relate in particular to a kind of SCM Based temperature display alarm system, belong to the single-chip microcomputer control technology field.

Background technology

Temperature is the most basic a kind of environmental parameter, and people's living environment and temperature are closely bound up, and temperature survey is also by abnormal concern of people institute.Therefore, measuring method and the device of research temperature are significant, and temperature detection-control technology is also used more and more extensive in every field.Adopt single-chip microcomputer that temperature is controlled, not only have and control convenient and the simple advantage of configuration, and can improve by the technical indicator of controlling temperature.Single-chip microcomputer can utilize the data of being read by DS18B20, DS1302 to come software to process, thereby data transmission is arrived display module, realizes the demonstration of temperature, calendar, also has alarm clock function and voice time-telling function.Temperature is implemented monitoring, and namely when temperature during over given maximum temperature or lower than given minimum temperature, system reports to the police by lumination of light emitting diode.

Summary of the invention

The present invention is used for temperature is controlled for a kind of SCM Based temperature display alarm system of providing is provided, and not only has and controls convenient and the simple advantage of configuration, and can improve by the technical indicator of controlling temperature.

The present invention for achieving the above object, adopt following technical scheme: a kind of SCM Based temperature display alarm system, comprise clock module, temperature sensor, stand-alone keypad module, single-chip microcomputer, LED alarm display module, LED screen display module and hummer, the output terminal of described clock module, temperature sensor, stand-alone keypad module connects the input end of single-chip microcomputer, and the output terminal of single-chip microcomputer connects respectively the input end of LED alarm display module, LED screen display module and hummer; Wherein, temperature sensor is to temperature survey, and by single-chip microcomputer being carried out the setting of alarm set point, with the liquid crystal display demonstration and with serial ports transmission data, displays temperature numerical value utilizes clock chip to carry out timing simultaneously, and stand-alone keypad is used for the adjustment to time of fire alarming.

The invention has the beneficial effects as follows: this system's keyboard is timing and temperature inquiry, function is stronger, the bound alarm temperature can be set, and measurement is accurate, error is little, compare with traditional thermometer, have convenient reading, temperature-measuring range and extensively reach output temperature and adopt the characteristics such as numeral demonstration, mainly be applicable to scientific experiment chamber etc. to thermometric requirement place more accurately.

Description of drawings

Fig. 1 is system architecture diagram;

Fig. 2 is Single Chip Microcomputer (SCM) system integrated circuit figure.

Embodiment

Describe below in conjunction with the technical scheme implementation method of accompanying drawing to invention: in Fig. 1, a kind of SCM Based temperature display alarm system, comprise clock module, temperature sensor, stand-alone keypad module, single-chip microcomputer, LED alarm display module, LED screen display module and hummer, the output terminal of described clock module, temperature sensor, stand-alone keypad module connects the input end of single-chip microcomputer, and the output terminal of single-chip microcomputer connects respectively the input end of LED alarm display module, LED screen display module and hummer; Wherein, temperature sensor is to temperature survey, and by single-chip microcomputer being carried out the setting of alarm set point, with the liquid crystal display demonstration and with serial ports transmission data, displays temperature numerical value utilizes clock chip to carry out timing simultaneously, and stand-alone keypad is used for the adjustment to time of fire alarming.

In the single chip circuit design, be all to use sensor mostly.Therefore, adopt temperature sensor DS18B20.DS18B20 is a kind of modified intelligent temperature sensor, can satisfy the temperature survey from-55 degrees centigrade to+125 degrees centigrade of scopes, and measuring accuracy is high, can become numeral to temperature inversion in one second, the temperature value that records is stored in the RAM of two eight, single-chip microcomputer can be directly sense data and to convert the decimal system to be exactly temperature therefrom, easy to use.Requirement during according to design, the design block scheme of taking are as shown in figure one, and controller adopts single chip computer AT 89S52, and temperature sensor adopts DS18B20, and liquid crystal display LCD1602 transmits with serial ports the demonstration that data realize temperature.In Fig. 2, the entire system hardware circuit comprises: sensor data acquisition circuit, temperature display circuit, bound warning Circuit tuning, single-chip microcomputer motherboard circuit, reset circuit etc.

In have three free-standing buttons can adjust respectively thermometer bound report to the police to arrange, when hummer exceeds the bound scope at dut temperature, send alarm call sound, LCD display does not have the dut temperature value to show simultaneously, at this moment adjust the warning bound as the system fruit, can measure tested temperature value.

Be that electrification reset adds hand-reset by strong reset circuit, usage comparison is convenient, when program fleet, can hand-reset, and so just not be used in and restart microcontroller power supply, just can realize resetting.

Liquid crystal display is TS1602-1, can show simultaneously 16*2 character, can carry out the left and right translation to character, and is easy to operate, takies 8 I/O ports.

Sensor for measuring temperature adopts the unibus digital temperature sensor of DS18B20, temperature-measuring range is-55 ℃～125 ℃, be programmed for 9～12 A/D conversion accuracies, thermometric resolution reaches 0.0625 ℃, adopt the parasite power working method, CPU only needs a bus just can communicate by letter with DS18B20, takies cpu bus few, can save a large amount of lead-in wires and logical circuit.

clock module adopts the DS1302 chip, DS1302 contains a real-time clock/calendar and 31 byte static RAM (SRAM)s by the trickle charge clock chip that DALLAS company releases, communicate by simple serial line interface and single-chip microcomputer, real-time clock/calendar circuit provides second information in year moon timesharing date, number of days per month and the number of days in leap year, can automatically adjust clock operation, can indicate by AM/PM and determine to adopt 24 or 12 hours forms, can adopt simply the mode of synchronous serial to communicate between DS1302 and single-chip microcomputer, only need use three-bus 1RES resets, the 2I/O data line, the 3SCLK serial clock.The read/write data of clock/RAM with a byte or nearly the character group mode of 31 bytes communicate by letter, during DS1302 work when the very low maintenance data of power consumption and clock information power less than 1mW.

Claims

1. SCM Based temperature display alarm system, it is characterized in that, comprise clock module, temperature sensor, stand-alone keypad module, single-chip microcomputer, LED alarm display module, LED screen display module and hummer, the output terminal of described clock module, temperature sensor, stand-alone keypad module connects the input end of single-chip microcomputer, and the output terminal of single-chip microcomputer connects respectively the input end of LED alarm display module, LED screen display module and hummer; Wherein, temperature sensor is to temperature survey, and by single-chip microcomputer being carried out the setting of alarm set point, with the liquid crystal display demonstration and with serial ports transmission data, displays temperature numerical value utilizes clock chip to carry out timing simultaneously, and stand-alone keypad is used for the adjustment to time of fire alarming.