Lesson 52: Control a DC motor with Relay using Arduino (two projects)

Please select other codes for this lecture from the links below.

Part 5: DC Motors

In this lesson we learn how to contorl a DC motor using two relays and Arduino advanced code . Please watch the video for full details. The difference between this code and the basic code is that you can select the trigger level type of relay so the code can work with HIGH level trigger and LOW level trigger relays. There are two codes. basic and advanced. This is Advanced code.

00:00 Introduction
04:27 How does it work
08:05 Wiring Explained
11:45 Basic Code Explained
15:25 Advanced code explained
18:40 Demonstration with two single relay
19:43 Demonstration with a dual relay module

AliExpress.com Product - 5pcs/lot L293D L293 DIP-16 In Stock


  
/*
* Lesson 51: Controlling 2 DC motor using L293D and Arduino | Arduino Step By Step Course
 * Arduino code (Advanced) change the direction of rotation 
 
 * of a DC motor with 2 relays.
 * This code can bused with High-Level Trigger relay a
 * and Low-Level Trigger relay. Watch video for instruction
 * This is basic code. I have advanced code which can be used in both 
 
 * for Low-level trigger and High-lever trigger relay with clean code
Please watch video explaining this code : https://youtu.be/2n0vUa0cZOI

 * 
 * Written by Ahmad Shamshiri for Robojax.com on 
 * Sunday August 18, 2019 
 * at 20:22 in Ajax, Ontario, Canada


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 * This is the Arduino code L293 DC motor DRIVEER 
Using this code you can control 2 motors to rotate in both directions
Please watch the video for full details of this code and project:
https://youtu.be/LkJRakZBChI

 
This code is available at http://robojax.com/course1/?vid=lecture51
 
with over 100 lectures Free On  YouTube Watch it here http://robojax.com/L/?id=338
Get the code for the course: http://robojax.com/L/?id=339  
 * on Saturday November 24, 2018 
 * in Ajax, Ontario, Canada
 * 
 
 * This code is "AS IS" without warranty or liability. Free to be used as long as you keep this note intact.* 
 * 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 <https://www.gnu.org/licenses/>.
 */


int relay1 = 2;
int relay2 = 3;

const int triggerType = LOW;// your relay type

int relayOFF, relayON;// relay ON and OFF values for LOW and HIGH Trigger relays



void setup() {

    pinMode(relay1, OUTPUT);// set pin as output for relay 1
    pinMode(relay2, OUTPUT);// set pin as output for relay 2


    if(triggerType ==LOW){
      relayON = LOW;
      relayOFF = HIGH;
      digitalWrite(relay1, relayOFF);//keep both relay OFF so motor is stopped
      digitalWrite(relay2, relayOFF);//keep both relay OFF so motor is stopped
    }else{
      relayON = HIGH;
      relayOFF = LOW; 
      digitalWrite(relay1, relayOFF);//keep both relay OFF so motor is stopped
      digitalWrite(relay2, relayOFF);//keep both relay OFF so motor is stopped
    }
 
  
  Serial.begin(9600);// initialize serial monitor with 9600 baud
  Serial.println("Robojax Motor Direction of Rotation");
  Serial.println("Using 2 Relays");  
  delay(2000);
}

void loop() {

 // Rotate in CCW direction
  motorCCW(); 
  delay(3000);// wait for 3 seconds

  motorStop();
  delay(2000);
  
 // Rotate in CW direction
  motorCW();
  delay(3000);// wait for 3 seconds

 motorStop();
 delay(2000);
  
 Serial.println("===============");
          
}// loop end

/*
 * motorCCW() 
 * controls the relay so the motor rotates in CCW
 */
void motorCCW()
{
  digitalWrite(relay1, relayON);// turn relay 1 ON
  digitalWrite(relay2, relayOFF);// turn relay 2 OFF  
  Serial.println("Rotating in CCW");    
}// motorCCW()


/*
 * motorCW() 
 * controls the relay so the motor rotates in CW
 */
void motorCW()
{
  digitalWrite(relay1, relayOFF);// turn relay 1 OFF
  digitalWrite(relay2, relayON);// turn relay 2 ON 
  Serial.println("Rotating in CW");  
}//motorCW()


/*
 * motorStop()
 * controls the relay so the motor is stopped
 */
void motorStop()
{
  digitalWrite(relay1, relayOFF);// turn relay 1 OFF
  digitalWrite(relay2, relayOFF);// turn relay 2 OFf 
  Serial.println("Stopped");    
}