基于51单片机和DS18B20温度传感器、7290数码管利用I2C协议做的温度采集报警系统，采用汇编语言，实现温度实时检测，精度为小数点后四位（当然18b20实际精确到0.5度，做到后几位是为了好看）。同时加入日历芯片，时间可设，有热键切换温度时间显示，便于工作日志的形成。-And DS18B20 temperature sensor based on 51 single-chip, the 7290 Digital tube I2C protocol to do temperature acquisition alarm system, using assembly language, to achieve real-time temperature detection accuracy of four decimal places (of course 18b20 actual accurate to 0.5 degrees, so after several to look good). Add to Calendar chip, the time can be set hotkey switching temperature to facilitate the formation of the working log.