So I’m trying to use the Automation pHat ADC to sense voltage from a battery and solar panel, while also powering the raspberrypi from the battery.
The battery is being charged by the solar panel, the pi is running from battery power, through a Wide Input Shim, stacked on-top of the automation pHat. I have ADC channels connected to battery + and solar cell +.
The trouble I’m having is I can only read the voltage of the battery - I cant get the separate voltage direct from the solar cell using a separate ADC channel. I’m guessing this is because I’m using a shared ground? Because when I test the solar voltage with a multimeter it reads correctly (different to the battery)
Any ideas on whether / how I can achieve reading both voltages separately?