This design is to make a digital voltagemetre by using single chip computer,and it can measure voltage between 0-5V, and the number of items is small.
First, the outside electric anology voltage transports to the inputs of the A/ D conversion part, changes into the arithmetic digital signal after passing the A/ D conversion, then transport to the single chip computer.Then the single chip computer give LED arithmetic digital signal, make it transmit light,so it can manifest arithmetic number.This electric circuit contain two light diode to manifest the state of the circuit. Moreover, this electric circuit contain a sound enlarger, also can manifest the state of the circuit.
Key words:Single chip computer;Arithmetic digital voltage metre;A/D conversion;Four figureses manifestation