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在单片机软硬件应用电路中，如果要实现独立的按键输入，在不使用其他的功能辅助IC的情况下，一般一个按键对应一个IO引脚，如果要实现多个独立按键输入，那么就要多个独立IO。如下图所示，普通IO实现的独立按键输入然而，在实际应用的很多场合下，我们往往会碰到单片机IO引脚不够用，或者，需要出于成本等原因，我们不能更换其他多IO的单片机。我们需要实现一个IO实现多个独立按键输入，下图所示的这种方法就是利用单片一个带ADC转换的IO实现多个按键输入检测。
上海聚东辉煌电子科技有限公司专注于回收电子ic等