Hi Now have a voltage sensor using voltage divider , I'm measuring a solar battery bank .
This bank has a lot of amps 1000, and a lot of high amps devices inverters etc
When the inverter push by the battery arduino some times get strange USB results on the pc side ...
So going direct I want to measure voltage without having common grounds..
At first I was thinking in 2 arduinos that communicate wireless
One measuring voltage other connected to pc ..
Then one arduino wireless connected but...
Must be a way to this cheaper and easy ..
i had the idea to do it with a mechanical relay that connects both ends of a capacitor first to the battery and then to the arduino... but i dont know if the relay likes it...
the other idea is: 1 ATtiny13 for each battery (powered by that battery) and communication with the "central" via opto-couplers...
when the capacitor is connected to the battery pack, it is not connected to arduino ground (not even via a voltage divider... air is a good isolator...)...
when the capacitor is connected to the voltage divider, it is isolated from the battery (again by air)...
does the URL work for u?
it doesnt work for me...
PS: i took the idea from the LTC1043 datasheet...
PPS: the relays might need external fly back diodes...
PPPS: i changed the picture a little bit... it might be easier to read now...