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-Microcontroller AT89S51 with ADC0809 design using a digital voltmeter to measure the 0-5V DC voltage between the value of four digital display

运用单片机实现烟雾、煤气报警和短路自检，主要用到ADC0809，AT89S51等。本项目最终做成实物，并能良好实现功能。有protel原理图，PCB布线图，完整的论文中有详细程序介绍。-Application of single chip microcomputer gas alarm and smoke, short circuit self-checking, mainly used in ADC0809, AT89S51 etc..This project eventually made

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)