采用PT100作为温度传感器,以单片机为核心器件的低成本高精度温度巡回检测系统.本系统主要从工程实际出发,采用分组三线制,既消除引线电阻的影响又达到简化外部电缆接线的目的,对元件选择、电路设计以及提高系统可靠性作了探讨,软件方法采用分段线性化处理,确保测量准确可靠、低成本、高精度. -PT100 used as a temperature sensor, single-chip microcomputer as the core device in the low-cost high-precision temperature detection system tour. This system is mainly from engineering reality using three-division system, both to eliminate the effects of lead resistance and simplify the connection of external cables The purpose of component selection, circuit design and improve system reliability are discussed, software, methods of using piecewise linear processing, to ensure that the measurements are accurate and reliable, low-cost, high-precision.