Electronics > Projects, Designs, and Technical Stuff
Problem reading multiple mains voltages with microcontroller.
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oPossum:
https://www.broadcom.com/products/optocouplers/industrial-plastic/specific-function/high-linearity-analog/hcnr201
Richard Crowley:
https://www.digikey.com/en/articles/techzone/2012/dec/linear-optical-isolation-for-safe-sensor-operation
StillTrying:
The safest way to probe all the live bridge and other waveforms up to the ADC inputs is in a simulation. :)
Marco:
I should add that the halfbridge approach only works when the "variac" is connected as shown, if it's actually a triac dimmer but you have no idea which connection it is cutting it won't.
jbb:
I think a differential amplifier might be the way to go here.

A linear optocoupler requires special measures to handle AC (and may then be prone to DC offsets) and requires isolated power.

A 50 (60?) Hz transformer is quite bulky and my have a distorted output. It may also add unwanted loading to whatever you’re measuring.

Please be careful when developing this circuit, it’s so easy to forget and stick your fingers on something dangerous. Also have a very thorough look at the enclosure for the final item - if someone damaged it (eg drops it or drops something on it) could some part break and allow a person to touch an electrical connection?
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