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请问这个3.3V是电源电压吗？如果是的话实际上电源不是3.3V，就会产生误差。并且直接接电源采样大概为4000左右，和4096有点误差。请问什么原因？
3.3V也就是芯片的供电电压
ADC有自己的模拟地和输入采集电压 采集这个相对值
你拿表笔测试AD口对地的电压是多少 然后和你采集的数字对比才有意义
实际上的供电电压不是3.3V，这样计算的采样值就会有误差
