Hardware Reference
In-Depth Information
5. Connect the lamp to the female power socket and then connect the male power
plug to the power socket in the wall. Of course, you need to repeat this operation
for every relay you have in your project. You can simply connect the power sup-
ply of each new relay module to the +5V and GND lines on the breadboard, and
the SIG pin of the new relay to a free digital pin on the Arduino board.
