Relay Module DFR0017 V3.1 Arduino CompatibleThe DFRobot single relay allows you to switch on and off a number of electronic modules The relay output state is indicated by an LED It can be controlled through the digital I O port to trigger a solenoid valve, lamp, motor or other high current or high voltage devices The DFRobot single relay allows you to switch on and off a number of electronic modules. It can be used in interactive projects or to control lighting, electrical and other equipment.