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ADS1115采集正电压正常,负电压全是65535

Other Parts Discussed in Thread: ADS1115

我在用ADS1115差分输入采集电压的时候,正电压正常,但采集负电压的时候,串口读出来的全是65535~~~是怎么回事儿?手册上的输出数据格式不是这个样子的啊……