This is the ESPea Relay Shield, an add-on board that allows your ESPea to control higher voltage and current loads through a relays. This shield provides great support of ESPea projects that require high power consumption or distribution. You can add maximum 4 stacks of Relay shields by a jumper.
You can cut orginal jumper for D1, wire other pin to relay.
|D1 (Default)||Relay Pin|
|D2||Not connected, can wire to Relay by jumper|
|D4||Not connected, can wire to Relay by jumper|
|D5||Not connected, can wire to Relay by jumper|
See the photo for jumpers
The LED will turn on when relay connected
5V power supply is needed by relay.