One-Channel Relay module

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Relay 1.jpg

The Arduino Relay module allows a wide range of microcontroller such as Arduino, AVR ,PIC, ARM with digital outputs to control larger loads and devices like AC or DC Motors, electromagnets, solenoids, and incandescent light bulbs. The relay shield use one QIANJI JQC-3F high-quality relay with rated load 7A/240VAC,10A/125VAC,10A/28VDC. This module is designed to be easily expanded with Arduino .The relay output state is indicated by a light-emitting diode.


  • Number of Relays: 1
  • Control signal: TTL level
  • Rated load: 7A/240VAC 10A/125VAC 10A/28VDC
  • Contact action time: 10ms/5ms
  • Module pin definitions: Pin1 - control, Pin3 - ground,Pin2 - VCC

Pin definition

Relay 1 pin.jpg

COM- Common pin
NC- Normally Closed, in which case NC is connected with COM when S is set low and disconnected when S is high;
NO- Normally Open, in which case NO is disconnected with COM1 when S is set low and connected when S is high.


Relay 1 wiring.jpg

VCC - 5V
S   - Digital pin3

Example code

int Relay = 3; 
void setup() 
 pinMode(Relay, OUTPUT);     //Set Pin3 as output 
void loop() 
         digitalWrite(Relay, HIGH);   //Turn off relay 
         digitalWrite(Relay, LOW);    //Turn on relay 

How to buy

Click here to buy [One-Channel Relay module]