This Relay Shield for Arduino acts like a switch. It is commonly used to control anything over 5V such as lamps, water pumps and garage doors.

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 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 circuits or devices directly to your Arduino.

This Arduino Shield is a completely newly designed that is able to control 4 relays at a time. The max switching power DC 90W or AC 360VA gives direct control by Arduino Uno/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 arduino relay shield is an ideal solution for home automation and robotics applications.

Note: The Arduino board requires an external power supply to drive the xbee module and relays.

Warning: Pay attention to the voltage that is over 38 volts.

Features

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

Specifications

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)
6 channels Analog IO & 13 channels Digital IO
Up to 4 Relay with photo-coupled circuit
Contact Rating 3A AC 120V / DC 24V
Max Switching Voltage AC 240V / DC 60V (Less than 38V is recommended)
Max Switching Current 5A
Max Switching Power AC 360VA / DC 90W
Electrical Life (Min) 100,000 Operations
Mechanical Life (Min) 10,000,000 Operations
Safety Standard(relay) UL cUL TUV CQC
Coil Working Voltage 9VDC
Working temperature -30°C to +85°C
Working Humidity 40% - 85%
Size: 95 x 65mm

Resources

Wiki (Relay Shield for Arduino V2.1)
Schematics
Board Layout
Sample code
HJR4102 datasheet

Pinout

Pin	Pin State: HIGH	Pin State: LOW
Digital 2	NC1 is disconnected with COM1	NC1 is connected with COM1
	NO1 is connected with COM1	NO1 is disconnected with COM1
Digital 7	NC2 is disconnected with COM2	NC2 is connected with COM2
	NO2 is connected with COM2	NO2 is disconnected with COM2
Digital 8	NC3 is disconnected with COM3	NC3 is connected with COM3
	NO3 is connected with COM3	NO3 is disconnected with COM3
Digital 10	NC4 is disconnected with COM4	NC4 is connected with COM4
	NO4 is connected with COM4	NO4 is disconnected with COM4
Note: NC: Normally Closed; NO: Normally Open.

Package Contents

1x Relay Shield for Arduino V2.1
2x Nylon stand-off with screw

Arduino Relay Shields

Gravity: 4 Channel Relay Shield for Arduino

Arduino 4 Relays Shield