模拟管脚电压读数紧密取决于Arduino的供电电压。
Analog pin voltage readings seem to depend critically on the voltage of the power supply to the Arduino.
模拟电路部分包括：电池电源供电模块、信号采集电路、模拟滤波和放大电路、增益调节电路、地电压抬升电路和A/D输入信号限制电路。
The analog circuit consists of power-supply modular, signal pickup circuit, analog filter amplifier, gain control circuit, power ground lifting circuit and signal limit circuit of A/D channel.
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