51单片机实现的AD数模转换
A/D转换器是用来通过一定的电路将模拟量转变为数字量。模拟量可以是电压、电流等电信号，也可以是压力、温度、湿度、位移、声音等非电信号。但在A/D转换前，输入到A/D转换器的输入信号必须经各种传感器把各种物理量转换成电压信号(AD digital analog conversion realized by 51 single chip microcomputer
The A/D converter is used to convert analog quantities into digital quantities through a certain circuit. The analog signals can be electrical signals, such as voltage, current, etc., or non electrical signals, such as pressure, temperature, humidity, displacement, sound, etc. But before the A/D conversion, input signals to the A/D converter must convert various physical quantities into voltage signals through various sensors)