基于单片机的多点温度测量仪的设计  

Design of multipoint thermometer based on single chip computer

作　　者：于相斌[1] 张庆国[1] 田辉[1] 

机构地区：[1]空军航空大学航空控制工程系,吉林长春130022

出　　处：《微型机与应用》2011年第8期20-22,共3页Microcomputer & Its Applications

摘　　要：提出一种以热敏电阻为温度传感器,经电阻-脉宽转换电路将热敏电阻的输出转换为脉宽信号,再由PIC16F876单片机进行处理,以实现多点温度显示的温度测量仪。采用比较法消除了电阻-脉宽转换电路由于器件参数变化造成的测量误差,提高了测量精度。该多点温度测量仪具有数字显示温度和以RS232串口输出温度的功能。This paper introduced a multipoint thermometer.This thermometer takes the semiconductor thermoresistor as sensor.The output of the sensor is turned into pulse width by means of a resistance-pulse width converting circuit.A single chip computer deal with the pulse width signal to realize the temperature indication.A comparison method is adopted to eliminate the measuring error of the resistace-pulse width converting circuit caused by the circuit parameter changes and the measuring pricision is improved.The multipoint thermometer can indicate the temperature in digital way and can also transmit temperature by a RS232 interface.

关 键 词：单片机 热敏电阻 电阻-脉宽转换电路 RS232串口 

分 类 号：TP274.1[自动化与计算机技术—检测技术与自动化装置]