摘要
提出了一种基于555定时器和单片机的温度测量电路设计方案。利用负温度系数热敏电阻测量外界温度,通过555定时器构成的多谐振荡器将温度传感器的阻值转换成频率信号,利用单片机的定时器测量振荡电路的振荡周期,由查表法得到实际温度值,从而实现温度测量。温度测量范围为0℃-99℃,分辨率为±1℃,体积小,成本低,工作可靠,可广泛应用于日常生活中。
The paper proposes a design scheme of temperature measurement circuit based on 555 timer and single chip microcomputer, and measures the temperature by thermistor. Based on multivibrator composed by 555 timer, the resistance of thermistor is converted into a frequency signal, whose oscillating period is measured by using the timer of single chip microcomputer. The actual temperature is attained by lookup table technique to realize temperature measurement. The circuit can measure the temperature in the range of 0℃ to 99 ℃ with an accuracy of ±1℃, low cost and high reliability.
出处
《电子工程师》
2008年第2期12-13,共2页
Electronic Engineer
关键词
温度传感器
555定时器
单片机
temperature sensor
555 timer
single chip microcomputer