Open Sprinkler
The OSPi board contains a DC-DC converter that generates 5VDC which goes to the Pi on pins 2 and 4. The Pi generates 3.3Volts which is used to power the shift register which interfaces to the relay drivers.
The OSPi board contains a DC-DC converter that generates 5VDC which goes to the Pi on pins 2 and 4. The Pi generates 3.3Volts which is used to power the shift register which interfaces to the relay drivers.