Thanks for all the details. It may take me a little time to digest it all.
I found this site to calculate the voltage divider resistance values
https://www.allaboutcircuits.com/tools/voltage-divider-calculator/ so that seems fairly easy.
I’ll give that power supply suggested above a try. I’m not really worried about the pico discharging a golf cart battery to the point of damaging it. The people who look after the bbq may address the button jamming problem.
The pico device on the bbq end will be set to use as little power as possible. It can wake up every 15 seconds or so and listen for a request for data. If it doesn’t get one it can go back to sleep. The remote reader device will normally be out of range so I can put a power switch on that and turn it off when not in use. When on, it can send say 4 requests one every 5 seconds until it gets a response then display the voltage received.
I’ll post more details on what I come up with and how it goes.
Thanks
David.
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