Relay shield for Arduino

The DFRobot Relay shield is capable of controlling 4 relays. The max switching power could be DC 90W or AC 360VA. It could be directly controlled by Arduino/DFRduino through digital IOs with external 9v supply. With buildin xbee type socket, it can be wirelessly controlled via Xbee/bluetooth/WPM. Make it an ideal solution for home automation and robotics purpose.

Note: For using with Arduino Uno, you need to be careful the pins on the Shield should not touched with USB connector when they are connected.

Specification

• Up to 4 Relay with photo-coupled circuit
• Contact Rating: 3A AC 120V / DC 24V
• Max Switching Voltage: AC 240V / DC 60V
• 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
• Weight: 165g
• Working temperature: -30℃ to +85℃
• Working temperature: 40% – 85%

Documents

• Schematics
• Wiki Doc
• Sample code

Connection Diagram

In this sample connection diagram, it shows how some LEDs can be controlled via relays, while this is a bit of overkill for controlling LEDs its only meant to be an example. These relays can be used to control lamps, or some other mid-voltage range appliances.

Sample Code

byte relayPin[4] = {2,3,4,5};

//D2 -> RELAY1
//D3 -> RELAY2
//D4 -> RELAY3
//D5 -> RELAY4

void setup(){
for(int i = 0; i < 4; i++) pinMode(relayPin[i],OUTPUT);
}

// an sample to switch the 4 relays

void loop(){

int i;
for(i = 0; i < 4; i++) digitalWrite(relayPin[i],HIGH);
delay(1000);
for(i = 0; i < 4; i++) digitalWrite(relayPin[i],LOW);
delay(1000);

}