Thanks Hammy, that’s a good tip. I’ve used a 4-20mA submersible pressure transducer on a 12v project before and from memory I think they most have a range from 9-24v. I’d love some advice on how to wire a 4-20mA sensor to a 3.3v MKR NB 1500 board if anybody has done it. Ideally boost an analogue pin and read the current draw to reduce the power consumption compared to a constantly powered i2c setup.