单根I/O口线实现多按键的新方法及其应用

A New Method and Application of Using One I/O Control a lot of Keys

本文介绍一种利用单片机A/D转换功能实现多按键的新方法及其应用,该方法仅需一条I/O口线.

This article introduces a new method that use A/D conversion of microcontroller, use one I/O of microcontroller, and control a lot of keys.And also introduces the typical application of the new method.