A multi-temperature measurement system was built using the microcontroller and the digital temperature sensor DS18B20. An eight digital tube displays the number and temperature of each measurement point. The dynamic scanning method was used in digital display, a SN74HC573AN was used as the drive, and a SN74HC138N was used as selecting signal. A key switch was installed between microcontroller P3.2 and the system GND, by which measurement points can be switched. To ensure stable operation, the external side of DS18 B20 VCC was connected to a +5 V power supply. The standard read-and-write function of DS18B20 was designed according to the read-and-write timing-sequence of the DS18B20. And the DS18B20 64 laser ROM was used for information addressing.%用单片机和数字温度传感器DS18B20构建多点测温系统,其硬件结构简单、布线方便.硬件设计上,用8位数码管分时显示各测量点的编号和温度,数码管显示采用动态扫描方法,用另一片SN74HC573AN驱动,用一片SN74HC138N作位选信号,在单片机的P3.2和系统地间接一个按键开关,可以通过按键用中断方式切换测量点,为保证运行稳定,DS18B20的VCC端外接+5V电源.软件设计上,根据DS18B20的读写时序图设计出DS18B20的读、写标准函数,多点测温系统用各DS18B20的64位激光ROM信息寻址.
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