Example Code for Arduino-Control relay ON or OFF

Assembly Instructions

Hardware Preparation

• DFR0251 Digital 16A Relay Module (SKU:DFR0251 x 1)
• DFRduino UNO R3 with IO Expansion Shield and USB Cable A-B (SKU:DFR0216-2 x 1)

Software Preparation

• Development Tool: Arduino IDE (version unspecified). Download link: Arduino IDE

Wiring Diagram

Sample Code

/*!
 * @brief A simple example to demo the control of the Gravity: Digital 16A relay 	
 *		  Module
 *
 * @copyright   Copyright (c) 2010 DFRobot Co.Ltd (https://www.dfrobot.com)
 * @licence     The MIT License (MIT)
 * @author      [Henry]([email protected])
 * @version  V1.0
 * @date  2020-01-02
 * @get from CN: https://www.dfrobot.cn.com
 * @get from EN: https://www.dfrobot.com/product-992.html
 */

//Configure the control IO pin
const int RelayPin = 2;

void setup() {
  pinMode(RelayPin, OUTPUT);
}

void loop() {
  //Turn the relay ON/OFF every 1s
  digitalWrite(RelayPin, HIGH);   //Turn on relay, COM and NO connected
  delay(1000);
  digitalWrite(RelayPin, LOW);   //Turn off relay, COM and NC connected
  delay(1000);
}

Result

• The LED indicator will blink every 1s. The sound of "tick-tock" can be heard, when the COM terminal is repeatedly connected to NC or NO。