I'm working on a project that includes a logic circuit which switches a battery using a MOSFET. The battery provides 12V, and I'm using a boost converter to step it up to around 1000V in order to charge a capacitor. Now, I want to monitor the voltage across the capacitor using an Arduino. The idea …

I recommend a linear optocoupler like the IL300, LOC110 etc. It's the safest way

What is the load that that voltage can tolerate. Just use a voltage divider with <a href="https://www.ebay.com/itm/325244197085?_skw=high+voltage+resistors&itmmeta=01JRYZQSABMW6T2DC2HDCFJTHR&itmprp=enc%3AAQAKAAAA8FkggFvd1GGDu0w3yXCmi1exVUzY69oi0j0FKTztai8yVAUXYvOG%2FhzkijuDvDhmET7ara1nJVJsO3iIKdE6RmY0cLDtsGiXHjUSjOfPZI4xRAIa1p3YPlolam%2BGaxlHp5c87ha6K2qvLOVw1LPaKPK3uypT0bxsEoA1sTdTT%2Bwye9MfTlDGs3KaDpsLZAd6%2FAP76lHH%2BiWmDHs5LEAN9HFc7RPd1B5NQSQ%2BwQXb23fIJr7SjrPTulP1cEy%2FeI%2Ffoj3tLuspvWUoueAICjsOnBA34aecR%2BgIpFtLuqzTwRWH10GKnNm8NbTCdBfrb6mCZg%3D%3D%7Ctkp%3ABFBMrJXf38dl">high-voltage/high resistance resistors. Leo

@Wawa gives you a good solution assuming the Arduino is powered by the same battery. Be sure to put a small cap on the A/D input as the divider impedance will be to high for a stable reading. I am assuming the ground for the Arduino and the HV circuit are the same.

How to read high voltage from isolated circuit using arduino

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Wawa April 16, 2025, 9:46am 3

What is the load that that voltage can tolerate.
Just use a voltage divider with high-voltage/high resistance resistors.
Leo

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How to read high voltage from isolated circuit using arduino

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