Lesson 55: Controlling DC motor using push buttons

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Part 5: DC Motors

In this lesson we learn how to start and stop one or two DC motors useing L298N motor driver module with Arduino. We use 2 push buttons. One push button to Start or Stop the motor and the second push button switch to change the direction of rotation from clocowise CW to counterclockwise CCW. Please watch the video for full details. There are two codes to control either single motor or two motores. This is to control Two DC motor.

00:00 Introduction
01:52 Wiring Explained
05:47 Code Explained (one motor)
13:49 Demonstration (one motor)
15:12 Demonstration (two motors)

AliExpress.com Product - 1pcs L298N MOTOR DRIVER module New Dual H Bridge DC Stepper Motor Drive Controller Board Module


 /*
 * Lesson 55: Controlling 2 DC Motors with push buttons with L298N 
 * Library Example for L298N Module to control with 2 push buttons
 * One Push button is used for CW/CCW  
 and One push button is used to stop the motor
* (this code is to control 2 motors). See the first code for single motor
 
 Watch video for full details of this code: https://youtu.be/diS_WkUdU-8
 * 

 * 
 * Written by Ahmad Shamshiri on October 20, 2019   at 14:58
 * in Ajax, Ontario, Canada. www.robojax.com
 * 
 * 
 * 
 * Get this code and other Arduino codes from Robojax.com


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 *  * 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 <https://www.gnu.org/licenses/>.
 */

#include <Robojax_L298N_DC_motor.h>
// motor 1 settings
#define IN1 2
#define IN2 4
#define ENA 3 // this pin must be PWM enabled pin

// motor 2 settings
#define IN3 7
#define IN4 6
#define ENB 5 // this pin must be PWM enabled pin

const int CCW = 2; // do not change
const int CW  = 1; // do not change
#define motor1 1 // do not change
#define motor2 2 // do not change
const int pushButtonDelayTime =200;


//*** Push buttons for motor 1 started 
int motor1Speed =60;// speed of motor 1 in % (60 means 60%)
const int motor1PushButtonDirection = 8;// push button for direcion change
const int motor1PushButtonStop = 9;// push button for START/STOP
const int motor1Minimum =15;//30% is minimum for motor 1
// do not change below this line
int motor1Direction =CCW;//
int motor1StopState=HIGH;//Stope state of motor 1
//*** Push buttons for motor 1 started  ended
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

//*** Push buttons for motor 2 started 
int motor2Speed =60;// speed of motor 2 in % (60 means 60%)
const int motor2PushButtonDirection = 10;// push button for direcion change
const int motor2PushButtonStop = 11;// push button for START/STOP
const int motor2Minimum =15;//30% is minimum for motor 2
// do not change below this line
int motor2Direction =CCW;//
int motor2StopState=HIGH;//Stope state of motor 2
//*** Push buttons for motor 2 started  ended
//%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%


// use the line below for 1 motor
//Robojax_L298N_DC_motor motor(IN1, IN2, ENA,true);

// use the line below for two motors
Robojax_L298N_DC_motor motor(IN1, IN2, ENA, IN3, IN4, ENB, true);

void setup() {
  Serial.begin(115200);
  motor.begin();

  //L298N DC Motor by Robojax.com
  // push buttons for motor 1
  pinMode(motor1PushButtonDirection, INPUT_PULLUP);
  pinMode(motor1PushButtonStop, INPUT_PULLUP);


  //L298N DC Motor by Robojax.com
  // push buttons for motor 2
  pinMode(motor2PushButtonDirection, INPUT_PULLUP);
  pinMode(motor2PushButtonStop, INPUT_PULLUP);
   
}


void loop() {
  updateState1();//read push buttons value for motor 1
  updateState2();//read push buttons value for motor 2
  
  if(motor1StopState ==HIGH)
  {
    motor.brake(1);     
  }else{
    motor.rotate(motor1, motor1Speed, motor1Direction);    
  }

  if(motor2StopState ==HIGH)
  {
    motor.brake(2);     
  }else{
    motor.rotate(motor2, motor2Speed, motor2Direction);    
  }  
  //motor.demo(1);

  //motor.rotate(motor1, motor1Speed, CW);//run motor1 at 60% speed in CW direction
 delay(pushButtonDelayTime);
  
}//

/*
 * 
 * updateState1()
 * @brief reads push buttons and updates values
 * @param none
 * @return no return
 * Written by Ahmad Shamshiri for robojax.com
 * on Oct 13, 2019 in Ajax, Ontario, Canada
 */
void updateState1()
{

  if(digitalRead(motor1PushButtonDirection) ==LOW){
      if(motor1Direction ==CW)
      {
        motor1Direction =CCW;// 
        Serial.println("***** Motor 1 Now CCW"); 
      }else{
        motor1Direction =CW;//
        Serial.println("***** Motor 1 Now CC");  
      }

  } //if for direction push button

 
  if(digitalRead(motor1PushButtonStop) ==LOW)
  {
   motor1StopState =1-motor1StopState;// toggle Star/stop
  }// if for start/stop push button 
  
}//updateState1 end

/*
 * 
 * updateState2()
 * @brief reads push buttons and updates values
 * @param none
 * @return no return
 * Written by Ahmad Shamshiri for robojax.com
 * on Oct 13, 2019 in Ajax, Ontario, Canada
 */
void updateState2()
{

  if(digitalRead(motor2PushButtonDirection) ==LOW){
      if(motor2Direction ==CW)
      {
        motor2Direction =CCW;// 
        Serial.println("***** Motor 2 Now CCW"); 
      }else{
        motor2Direction =CW;//
        Serial.println("***** Motor 2 Now CC");  
      }

  } //if for direction push button 

 
  if(digitalRead(motor2PushButtonStop) ==LOW)
  {
   motor2StopState =1-motor2StopState;// toggle Star/stop
  }// if for start/stop push button 
    
}//updateState2 end

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