5V/220V 1 Channel Optocouplers Relay Shield Compatible with Arduino -
Adafruit Mini Relais FeatherWing, selbsthaltend | Paradisetronic.com
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Controllable Four Outlet Power Relay Module version 2 [(Power Switch Tail Alternative)] : ID 2935 : $39.95 : Adafruit Industries, Unique & fun DIY electronics and kits
How to Set Up a 5V Relay on the Arduino #ArduinoD16 « Adafruit Industries – Makers, hackers, artists, designers and engineers!