I would like to measure a sensor which uses a 4-20mA current output. The easiest way would be to set the voltage drop to around 5V using a 250 ohm resistor and measure the voltage using the analog pin.

I’ve seen people recommending using a shield specifically for measuring 4-20mA currents.

What is the advantage of these shields? Are they more accurate? Do they reduce noise?

  • the 4-20mA current loop is impervious to voltage drop over long distances ... the sender simply adjusts the output voltage until the desired current is flowing in the loop – jsotola Jul 18 '19 at 5:03

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