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触摸传感器QST108与PIC单片机的接口设计
lj_0522 | 2008-07-17 00:45:29    阅读:1913   发布文章

 5 软件设计

  软件部分包括PIC16F877A和QST108的初始化、触摸按键检测子程序、单片机的中断程序,以及根据按键检测的结果进行各种处理的程序等。限于篇幅,本文只给出了PIC16F877A读取按键状态的子程序。假设QST108的器件地址为0,程序如下:

 

  结 语

  本文着重介绍了电容式触摸传感器QST108的工作方式、主要操作命令以及QST108与PIC单片机的接口设计。QST108允许用户用普通或挠性印制电路板设计8键电容性触摸板,因此可将导电墨印刷在电路板上作为感应电极;基于QST108应用的外部组件需求很少,每个通道只需1个采样电容和1个电阻。由于具有这些特点,QST108非常适合应用在能够对用户触摸做出响应的智能控制界面中。

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