非接触的按键有多种方案，而电容感应按键则是低成本的方案，多年前一般是使用专门的IC来实现，随着MCU功能的加强，以及广大用户的实践经验，直接使用MCU来做电容感应按键的技术已经成熟，其中最典型最可靠的是使用ADC做的方案。

本文档详述使用STC带ADC的系列MCU做的方案，可以使用任何带ADC功能的MCU来实现。-Non contact key has a variety of programs, and the capacitive induction key is low cost solution, years ago in general is to use special IC to achieve, with the strengthening of the function of MCU, and the practical experience of the majority of users, the direct use of MCU to do the capacitive induction key technology has matured, the most typical is the use of the most reliable ADC plan to do.

This document details the series of MCU using STC with ADC to do the program, you can use any ADC function with the MCU to achieve.