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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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