利用单片机AT89S51与ADC0809设计一个数字电压表，能够测量0－5V之间的直流电压值，四位数码显示。-MCU AT89S51 and ADC0809 design using a digital voltmeter that can measure between 0-5V DC voltage, 4 digital display.

利用单片机AT89S51与ADC0809设计一个数字电压表，能够测量0－5V之间的直流电压值，四位数码显示，但要求使用的元器件数目最少。-AT89S51 and ADC0809 microchip design a digital voltmeter, capable of measuring between 0-5V DC voltage, four digital display, but requires a minimum number of components.

ADC0809 AT89S51 继电器 基于家用电器的过欠压保护电路设计（未完善）-ADC0809 AT89S51 relay based on household appliances, over-voltage protection circuit design (not perfect)

AT89S51+ADC0809电压测量显示程序(Keil uVision3+Proteus 7.8仿真通过)-AT89S51+ADC0809(Keil uVision3+Proteus 7.8