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Lesson 54: Controlling DC motor using Potentiometer and push buttons

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Part 5: DC Motors

In this lesson we learn how to control speed of motor using potentiometer and L298N motor driver module. We also use three push button switches to control the direction of rotation clockwise and counterclockwise. The third push button is to start and STOP motor.Please watch the video for full details. There are two codes to control either single motor or two motores. This is to control Single DC motor.

  • 00:00 Introduction
  • 02:33 Wiring for single motor Explained
  • 09:28 Code for single motor Explained
  • 17:07 Wiring for two motor
  • 20:13 Code for 2 motors explained
  • 21:39 Demonstration 1 motor
  • 23:32 Demonstration 2 motors Product - 1pcs L298N MOTOR DRIVER module New Dual H Bridge DC Stepper Motor Drive Controller Board Module

 * Lesson 54: Controlling DC motor using Potentiometer and push buttons| Arduino Step By Step Course
 * Library Example for L298N Module to control DC 1 motor with 3 push buttons (see the link for controlling 2 motors)
 * This code is to control DC motors using two potentiometer (variable resistors)
 * Written by Ahmad Shamshiri on October 11, 2019  
 * in Ajax, Ontario, Canada.
 * Watch video instruction for this code:
 * Get this code and other Arduino codes from

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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
    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
    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 <>.

#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

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

//*** Potentiometer and push button for motor 1 started 

const int motor1PushButtonCW = 8;
const int motor1PushButtonStop = 9;
const int motor1PushButtonCCW = 10;
const int pot1Input = A0;
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
int motor1Speed =0;// speed of motor 1
//*** Potentiometer and push button for motor 1 ended

// use the line below for single 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, IN2, IN3, ENB, true);

void setup() {

  //L298N DC Motor by
  pinMode(motor1PushButtonCW, INPUT_PULLUP);
  pinMode(motor1PushButtonStop, INPUT_PULLUP);
  pinMode(motor1PushButtonCCW, INPUT_PULLUP); 

void loop() {
  updateState1();//read all push buttons
  int pot1Value= analogRead(pot1Input);// read potentiometer value

  motor1Speed = map(pot1Value, 0,1023, motor1Minimum, 100);// convert 0-5V to 0-100%

  if(motor1StopState ==HIGH)
    motor.rotate(motor1, motor1Speed, motor1Direction);    

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


 * updateState1()
 * @brief reads push buttons and updates values
 * @param none
 * @return no return
 * Written by Ahmad Shamshiri for
 * on Oct 11, 2019 in Ajax, Ontario, Canada
void updateState1()

  if(digitalRead(motor1PushButtonCW) ==LOW && motor1StopState !=LOW){

   motor1Direction =CW;// CW button is pressed  
   motor1StopState =LOW;

  if(digitalRead(motor1PushButtonCCW) ==LOW && motor1StopState !=LOW)
   motor1Direction =CCW;
   motor1StopState =LOW;   

  if(digitalRead(motor1PushButtonStop) ==LOW)
   motor1StopState =HIGH;// STOP button is pressed 
}//updateState end


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