Part 5: DC Motors
In this lesson we learn how to use L293D Motor driver to drive 2 DC motors using Arduino code to contorl motor in both direction. Please watch the video for full details.
- Introduction
- Wiring of L293D Explained
- Code Explained
- Running code demonstration
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/*
* Lesson 51: Controlling 2 DC motor using L293D and Arduino | Arduino Step By Step Course
* 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
* *
// Writeen by Ahmad Shamshiri for Robojax.com on
// on Jan 26, 2019 at 08:01 in Ajax, Ontario, Canada
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/>.
*/
#define Pin1A 2 // define Pin1A 1A pin
#define Pin2A 4 // define Pin2A 2A pin
#define EN12 3 // define pin 3 for EN1, 2 (must be PWM pin)
#define Pin3A 8 // define Pin3A 3A pin
#define Pin4A 9 // define Pin4A 4A pin
#define EN34 10 // define pin 10 for EN3,4 (must be PWM pin)
const int CCW =1; // defining CCW variable
const int CW =2; // defining CW variable
void setup() {
// L293 Motor Control Code
Serial.begin(9600);// setup Serial Monitor to display information
pinMode(Pin1A, OUTPUT);// define pin as OUTPUT for Pin1A
pinMode(Pin2A, OUTPUT);// define pin as OUTPUT for Pin2A
pinMode(EN12, OUTPUT);// define pin as OUTPUT for EN12
pinMode(Pin3A, OUTPUT);// define pin as OUTPUT for Pin3A
pinMode(Pin4A, OUTPUT);// define pin as OUTPUT for Pin4A
pinMode(EN34, OUTPUT);// define pin as OUTPUT for EN34
// L293 Motor Control Code
}
void loop() {
// L293 Motor Control Code
motor(1,255,CW);// motor 1 CW at 255
delay(5000);// wait for 5 seconds
motor(2,170,CCW);// motor 2 CCW at 150
delay(5000);// wait for 5 seconds
motor(1,0, CCW);// stop 1 motor
delay(5000);// wait for 5 seconds
motor(1,170,CCW);// motor 1 CCW at 255
delay(5000);// wait for 5 seconds
motor(2,255,CW);// motor 2 CW at 255
delay(5000);// wait for 5 seconds
motor(2,0, CCW);// stop 2 motor
delay(5000);// wait for 5 seconds
Serial.println("====== Loop done");
// L293 Motor Control Code
}// loop end
/*
* drives L293D motor drivers
* @param motor is motor number (1 or 2)
* @param pwm is the PWM value 0 to 255
* @param dir is the direction (CW or CCW)
*/
void motor(int motor, int pwm, int dir)
{
int drive1Pin, drive2Pin, driveENPin;
String motorTitle;// define motor text
if(motor ==1){
drive1Pin = Pin1A;
drive2Pin = Pin2A;
driveENPin = EN12;
motorTitle ="Motor 1";
}else{
drive1Pin = Pin3A;
drive2Pin = Pin4A;
driveENPin = EN34;
motorTitle ="Motor 2";
}
if(dir ==1){
digitalWrite(drive1Pin,LOW);//LOW signal
digitalWrite(drive2Pin,HIGH);//HIGH signal
if(pwm ==0){
Serial.print(motorTitle);
Serial.println(" Stopped");
}else{
Serial.print(motorTitle);
Serial.print(" Rotating CCW: ");
Serial.println(pwm);//print actual speed value
}
}else{
digitalWrite(drive1Pin,HIGH);//HIGH signal
digitalWrite(drive2Pin,LOW);//LOW signal
if(pwm ==0){
Serial.print(motorTitle);
Serial.println(" Stopped");
}else{
Serial.print(motorTitle);
Serial.print(" Rotating CW: ");
Serial.println(pwm);//print actual speed value
}
}
analogWrite(driveENPin ,pwm);// send PWM to driveENPin
}//motor
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