用18B20（数字温度采集）74LS47(数码管译码)74LS138(三八译码) DS18B20是DALLAS公司生产的一线式数字温度传感器，具有3引脚TO－92小体积封装形式；温度测量范围为－55℃～＋125℃,可编程为9位～12位A/D转换精度，测温分辨率可达0.0625℃，被测温度用符号扩展的16位数字量方式串行输出.-With 18B20 (Digital Temperature Acquisition) 74LS47 (decoding digital tube) 74LS138 (decoder 38) DS18B20 is produced by first-line DALLAS digital temperature sensor with a 3-pin TO-92 package of small size　temperature measurement range of-55 ℃ ~+125 ℃, Programmable for 9 ~ 12-bit A/D conversion accuracy, temperature measurement resolution of up to 0.0625 ℃, the temperature measured using symbols to expand the 16-digit serial output methods.