一种电容式触摸输入模块的设计

The Design of A Capacitive Touch Input Module

针对传统机械按键式输入方式易磨损、寿命短等不足,设计了一种电容式触摸输入模块。分析了电容式触摸的基本原理,包括接触前后电容值变化和对变化电容值的检测,并对现有的几种电容检测方法的优缺点和易于实现程度进行了详细阐述;设计了一种基于松弛振荡器电容值检测方法的电容式触摸输入模块的方案,并给出了基于PSoC微处理器的电容式触摸模块的软硬件设计流程。实验表明设计的电容式触摸输入模块精确度较高,灵敏度可调,误操作率低,具有一定的工程应用价值。

Compare to the traditional mechanism button which is slider and potentiometer,this paper designs a capacitive touch input module.At first,the paper gives a general introduce to this technology,which includes the changes in capacitance value before and after touch,and introduce the several existing capacitance detection method and the possibility of realization.Then designs a capacitive touch input module scheme based on relaxation oscillator.The realization of the input module based on PSoC chip,includes ha...