Description: 用8 位AD 芯片（PCF8591）模数转换原理，通过按键选择不同通道AD，并在数码管上显示该通道的模拟电压值 四路数字电压表-With 8-bit AD-chip (PCF8591) analog-digital conversion principle, through selecting different channel buttons AD, and in the digital control displays the Platform: |
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