基于单片机控制的数字温度计的设计

Design of digital thermometer based on microcontroller

基于实际应用中许多场合对温度高精度测量的需求,利用ATF1504芯片与单片机最小系统,采用等精度频率测量技术,设计了一款高精度数字温度计。该方案采用ATF1504芯片作为可编程逻辑器件,以高灵敏度负温度系数热敏电阻为温度传感器。利用ATF1504芯片与单片机配合完成待测信号频率的精确测量,从而实现温度的精确测量。实验数据表明该温度计的测温相对误差小于0.3%。

Aiming at the requirement of high-precision temperature measurement on most practical application occasions,this paper presented a design scheme of high-precision thermometer based on ATF1504 and smallest system of single-chip computer and adopted by same accuracy frequency measurement technique.In this design,ATF1504 chip is as a programmable logic device,and NTC（Negative Temperature Coefficient）is as temperature sensor.The small accuracy frequency measurement technique is adopted in the thermometer using ATF1504 chip and single-chip computer,which realized temperature precision measurement.The experiment results show that the measurement temperature relative error of the designed thermometer is less than 0.3%.The experiments on most practical application occasions show that the thermometer possesses stable operation and high reliability.