Hi, I need to measure currents in a PSU between 0 and 3A with at least 10mA accuracy. I thought an ACS712 Hall sensor would do it but there I barely get 185mV/A, insufficient to get any decent measurement out of the ADC on an Arduino Uno. I may go with opamps to amplify the sensor output but then I…

DC current sensing with INA219B

brice3010 September 18, 2016, 3:58am 3

Hi Leo. A shunt on the positive rail, but what with the GND: there are 40V between + and - and I need to power the controller with GND is negative reference. What now?

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DC current sensing with INA219B

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