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);    
  }

}


   

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