OK, so I hacked my fridge, compromised on the fly because the online wiring diagram from the manufacturer wasn’t quite right. Probably a standard issue that the power to the therm
and door switch/lamp is common and is split at the internal therm. I included an SPDT switch to enable a Brewpi mode switched to a standard fridge mode (“the fridge is absolutely normal as it was” ) so I had to compromise slightly.
I also have an issue where the (brewpi) fridge is plugged in and working but the RPi supply is unplugged or stolen to charge a phone!
Now on to topic:
I want to add DC supply hard wired into the fridge :slight_smile;
Clearly I need a PSU. My guess is that I’m better off providing 12VDC to the BrewPi so that once set it will soldier on.
I also want 5VDC for the RPi and I understand its a littel fussy.
My plan was a 240VAC to 12VDC PSU hard wired into the fridge (2A or 5A) - I’m in the UK
then a 12VDC to 5VDC “buck board” - available cheaply - to act like a dual tap - 12VDC and 5VDC
am I better off with two PSUs - one at 12VDC and one at 5VDC.
My prime concern is to make it fit behind the fridge and to make it fault tolerant, currently I power the BrewPi from the USB from the RPi which works OK but is frail.