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ads1115采集数据误差较大

Other Parts Discussed in Thread: ADS1115

ads1115在采集距离传感器输入的0.9v时误差较大,为0.03v,在0.6和1.2左右都是0.01v的误差,请问这是为什么;在误差为0.03v时候,计算出来的电流和距离传感器的标准电流差了0.04ma,对应实际距离差了十几毫米