I'd like to set up a small DIY water too off system. My schematic can be seen below as well as the parts I'd like to use. I've received a little bit of conflicting advise on another forum if the board will work or not. Specifically "The schematic does not show a voltage regulator from 12 Volts to 5 Volts. There is a P9 mentioned in the schematic with separate 5 Volts and 12 Volts pins."