本电路由89C51单片机温度传感器、模数转换器ADC0809、串入并出移位寄存器74LS164、数码管和LED显示电路等组成。由热敏电阻温度传感器测量环境温度，将其电压值送入ADC0809的IN0通道进行模数转换，转换所得的数字量由数据端D0-D7输出到89C51的P0口，经软件处理后将测量的温度值经单片机的RXD端串行输出到74LS164，经74LS164串并转换后，输出到数码管的7个显示段，用数字形式显示出当前的温度值(51 MCU multi-channel temperature acq

用74ls164的并行输出端接8个发光二极管，利用它的串入并出的功能，把发光二极管从左到右轮流点亮一个灯，并反复循环。（即流水灯效果）(A parallel output terminal of 74LS164 is used to connect 8 light-emitting diodes. By using its function of string in and out, the LED can turn a lamp on from left to right and circul

74LS143与STM32F103连接，PA.0和PA.1控制A和B的收发，PB.0为时钟控制，连接clock。(The 74LS143 is connected to the STM32F103. PA.0 and PA.1 control the sending and receiving of A and B. PB.0 controls the clock and connects the clock.)