Arduino, IoT, Productivity Hacks.
VCC. Leave this in place as-is. Jumper K1 position 1 to K2 position 1 Place a jumper wire from the first position on the K1 relay to the first position on the K2 relay. Our jumper is shown in red. Jumper K1 position 3 to K2 position 3 Place a jumper wire from the third position on the K1 relay to