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> 触摸屏结构
猫猫草
post 2008-07-13 19:52:50, Sun
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触摸屏是一个四线电阻屏幕,可以示意出两个电阻,测量X方向的时候,将X+,X-之间加上参考电压Vref,Y-断开,Y+作为A/D输入,进行A/D转换获得X方向的电压,同理测量Y方向的时候,将Y+,Y-之间加上参考电压Vref,X- 断开,X+作为A/D输入,进行A/D转换获得Y方向的电压,之后再完成电压与坐标的换算。整个过程类似一个电位器,触摸不同的位置分得不同的电压。
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