@davee thanks. Sorry It was the pzem 15 that I cooked so I moved on to the 17, I’ve ordered a serial converter to try and read the output. However I...

@inst-tech sounds like a lifetime of experience you have there.

@inst-tech Thank you, I used IN5817 as you suggested and it works a treat

Hello again, hope everyone is well. Thank you all for your help. I settled on a circuit based on the DigiKey article that @DaveE sent me. I've...

@inst-tech @davee Thanks both I've ordered schottky diodes, resistors and capacitors, plus 3 more esp32s just in case :o) Thanks again for y...

@davee Please can I check I have understood what is going on in the circuit you drew for me? the diodes are sized such that they reverse ...

@davee Thanks Dave that article is a great find. I will have a go at drawing what I "think" Ive understood :o) Cheers

@inst-tech well spotted, many thanks

@davee thanks, I have some voltage dividers and will order some diodes and try again :0)

@will thanks, I have some voltage divider boards with 7.5 and 30 resistors. The voltage when the engine is running an be around 14.5v so these should...

@robotbuilder thanks for these links, I hadn’t seen the third one before, lots of useful thoughts

Here is a drawing of what I would like to do, however how best to protect the esp32 from 12v?

@robotbuilder Thanks for the reply, I will give one of the online drawing utilities a go and post a diagram Cheers

Looking at the drawing I’m not sure the microphone module is wired up correctly this is a useful pdf particularly page 8 what is i...