配置单片机的A/D转换器模块，使其对D2区的电位器进行采样，采样结果显示在数码管上。满量程电压为3.3V时，10位A/D的分辨率大约为3mV，由于受噪声影响，A/D采集的数值会出现噪声，尝试添加数字滤波算法，降低噪声的影响。-Configure MCU A/D converter module, so pairs of D2 region potentiometer sampled, the sampling results show that in the digital pipe. Full-scale voltage of 3.3V, the 10-bit A/D resolution of about 3mV, due to noise, A/D acquisition value will appear noise, try to add a digital filter algorithm to reduce noise effects.