Back to Step by Step Course by Robojax

Lesson 68: control 16 channel relay with Arduino UNO or MEGA

  • Solving wiring problem with this module(youTube video)
  • How to use this relay with just 4 wires
  • Part 6: Using Relay with Arduino

    In this lesson we learn about relay and how to use 16 channel realy with Arduino UNO or Arduino Mega. The wiring of a relay module is shown and code is explained.
    This module has problem with voltage to relay. See my video Showing you how to solve the problem.

    How to use this relay with just 4 wires or See Control more than 1 relay at a time in the 16 Channel relay module

    • 0:00 Introduction
    • 01:22 Hardware explained
    • 05:40 load calculation
    • 06:47 Design flaw in the module (must see)
    • 08:46 Code is explained
    • 12:54 Wiring Explained
    • 14:20 Demonstration
    
      /*
     Lesson 68: control 16 channel relay with Arduino UNO or MEGA
     * Arduino code to control 16 channel relay with Arduino UNO
     * 
     * Written by Ahmad Shamshiri for Robojax.com on Sunday Oct 08, 2018 
     * at 10:35 in Ajax, Ontario, Canada
     * Watch video instruction for this code: https://youtu.be/Q9aBI4ELKC4
     * 
     * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
     * This code has been download from Robojax.com
        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.
    
        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.
    
        You should have received a copy of the GNU General Public License
        along with this program.  If not, see .
     */
    
    
    const int controlPin[16] = {2,3,4,5,6,7,8,9,10,11,12,A0,A1,A2,A3,A4}; // define pins
    
    const int triggerType = LOW;// your relay type
    int loopDelay = 1000;// delay in loop
    int tmpStat =1;
    
    
    void setup() {
      for(int i=0; i<16; i++)
      {
        pinMode(controlPin[i], OUTPUT);// set pin as output
        if(triggerType ==LOW){
          digitalWrite(controlPin[i], HIGH); // set initial state OFF for low trigger relay
        }else{
           digitalWrite(controlPin[i], LOW); // set initial state OFF for high trigger relay     
        }
      }
      
      Serial.begin(9600);// initialize serial monitor with 9600 baud
    }
    
    void loop() {
    
      for(int i=0; i<16; i++)
      {
    
       channelControl(i,tmpStat,200);// turn each relay ON for 200ms
    
        
      }
      if(tmpStat)
      {
        tmpStat=0;
      }else{
        tmpStat=1;
      }
     Serial.println("===============");
     //channelControl(6,1, 2000); // turn relay 7 ON for 2 seconds
     //channelControl(6,0, 5000); // turn relay 7 OFF for 5 seconds
     //channelControl(9,1, 3000); // turn relay 10 OFF for ever
    
     delay(loopDelay);// wait for loopDelay ms
              
    }
    
    /*
     * funciton: channelControl
     * turns ON or OFF specific relay channel
     * @param relayChannel is integer value channel from 0 to 15
     * @param action is 1 for ON or 0 for OFF
     * @param t is time in melisecond
     */
    void channelControl(int relayChannel, int action, int t)
    {
      int state =LOW;
      String statTXT =" ON";
      if(triggerType == LOW)
      {    
        if (action ==0)// if OFF requested
        {
          state = HIGH;
          statTXT = " OFF";
        }
        digitalWrite(controlPin[relayChannel], state);
        if(t >0 )
        {
          delay(t);
        }
           Serial.print ("Channel: ");
           Serial.print(relayChannel); 
           Serial.print(statTXT);
           Serial.print(" - "); 
           Serial.println(t);        
      }else{
        if (action ==1)// if ON requested
        {
          state = HIGH;     
        }else{
          statTXT = " OFF";    
        }
        digitalWrite(controlPin[relayChannel], state);
        if(t >0 )
        {
          delay(t);
        }
           Serial.print ("Channel: ");
           Serial.print(relayChannel); 
           Serial.print(statTXT);
           Serial.print(" - "); 
           Serial.println(t);    
      }
    
    }
    
    
       

    The least I expect from you is to give the video a thumbs up and subscribe to my channel. I appreciate it. I have spent hundreds of hours making these lectures and writing code. You don't lose anything by subscribing to my channel. Your subscription is a stamp of approval for my videos, helping more people find them and, in turn, helping me. Thank you!

    If you found this tutorial helpful, please support me so I can continue creating content like this. support me via PayPal

    **** AFFILIATE PROGRAM **** We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.

    Right Side
    footer