When using Arduino to do interactive projects, a lot of high current or high voltage devices usually can not be directly used Arduino digital IOport control
(Such as solenoid valves, lamps, motors, etc.), then you can consider using the relay programs to address.
Arduino Relay Shield is the use of high-quality relay Songle provides fourinputs and outputs can be connected up to 250V/10A AC equipment
Or 24V/10A DC device, thus can be used to control the lamps, motors and other devices.
The modular design makes it easy with Arduino expansion boards are connected. Relay output state by a light-emitting diode that facilitate practical use.
Technical parameters:
Control signal: TTL level
rated load:
10A 250VAC
10A 125VAC
10A 30DC
10A 28VDC
Rated through current: 10A (NO) 5A (NC)
Maximum switching voltage: 250VAC 30VDC
Contact action time: 10ms less
Module pin definitions:
1 1 feet -4 foot - control side,
2 power supply ( VCC )
3 ground ( GND )