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摘 要:
为了满足不同温度范围的测试要求,自行设计了恒温箱的控制器。提出一种采用廉价单片机进行温度测量、显示、报警与控制的电路设计方案。采用热敏电阻感知温度变化,由电阻电压的变化反映温度变化,将电压放大后通过AD转换芯片对模拟电压进行采集,并将模拟量转换为数字量;然后将计算得到的温度实时通过数码管进行动态显示。设定温度的上下限值,在温度超出限值时发出相应的报警信号,并控制相关设备将温度设定在限值之内。
关键词:
温度控制器 恒温箱 报警
分类号: TP273
文献标识码:A
文章编号:1002-4956(2010)01-0065-04
栏目信息:仪器设备研制与应用
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Temperature controller design for thermostat
Hong Munan,Lu Wenwen,Li Jianqiu
1.Department of Automotive Engineering,Tsinghua University,Beijing 100084,China;2.Department of Electronic Information Engineering,Sichuan University of Science and Engineering,Zigong 64300,China
Abstract:
To satisfy the testing requirement of different ranges of temperature,a controller for thermostat is designed.A circuit with the functions including temperature measuring,display,alarm and control by using cheap micro-computer is presented.A thermistor is adopted to detect the change of temperature,which is transferred to change of resistance.Through a measuring circuit,the resistance change is transferred to voltage change further.The voltage is magnified and acquired by an AD converter.Temperature is calculated and displayed through three numeric display LEDs.In the meanwhile,temperature limits can be set.When temperature is out of allowed range,the corresponding equipment can be activated to ensure the temperature is within the limit.
Key words:
temperature controller; thermostat; alarm
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