One of the most interesting projects for your boards is perhaps being able to control High power devices like Lamps, water pumps, garage doors and so on. But interfacing with high power and AC is quite a dangerous task when building the circuitry. Relays allow for interfacing an external electrical circuit like a switch. With relays you can now connect external circuit or devices directly to your Arduino.
DFRobot Relay Shield V2.1 is a completely new design which is capable of controlling 4 relays at a time. The max switching power DC 90W or AC 360VA gives direct control by Arduino/DFRduino controllers through digital I/Os with external 9V supply. With built-in Xbee socket, it can be wireless remote controlled via Xbee/bluetooth/WPM.
This relay shield is an ideal solution for home automation and robotics purposes.
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Compatible with Arduino UNO Rev3
Each Relay has its own test button to test the connection
Standard DFRobot 3 Pin out
XBee I/O direct control
Compatible with Arduino Rev3
4 buttons to test module
LED status indicator of relay
Support Xbee IO directly control
Xbee socket for wireless communication
Selectable digital IO pin for control(Default digital 2,7,8,10)