Tutorial: L293D H Bridge DC motor controller with Arduino

On this tutorial, we will show you how to use the L293D DC motor controller with the Arduino. The L293D is a H Bridge type IC and can control DC motors up to 36V. For detailed specs, check the datasheet.

Let's take a look at the L293D pinout:

As shown in the picture above, it's possible to drive 2 motors with a single L293D, however the power supply has to be strong enough to provide enough current. Here we will demonstrate with just one motor. The following table shows how to make the motor turn clockwise and anti-clockwise:

For example, if the pins 1 and 7 are in HIGH state, and the pin 2 in the LOW, the motor will rotate clockwise. On the other hand, if the pins 1 and 2 are in HIGH, and the pin 7 in the LOW, the motor will turn to the other way.

With a push button, a 10Kohm resistor, a DC motor, a 9V battery, an Arduino and the L293D, let's make this circuit:

On this circuit, the 9V battery supply the energy to the DC motor. Be careful, check you motor datasheet before connect it to the circuit!

After that, open your Arduino IDE and upload this code:

int switchPin = 2; // switch input
int motor1Pin1 = 3; // pin 2 on L293D
int motor1Pin2 = 4; // pin 7 on L293D
int enablePin = 9; // pin 1 on L293D

void setup() {
    // set the switch as an input:
    pinMode(switchPin, INPUT);

    // set all the other pins you're using as outputs:
    pinMode(motor1Pin1, OUTPUT);
    pinMode(motor1Pin2, OUTPUT);
    pinMode(enablePin, OUTPUT);

    // set enablePin high so that motor can turn on:
    digitalWrite(enablePin, HIGH);
}

void loop() {
    // if the switch is high, motor will turn on one direction:
    if (digitalRead(switchPin) == HIGH) {
        digitalWrite(motor1Pin1, LOW); // set pin 2 on L293D low
        digitalWrite(motor1Pin2, HIGH); // set pin 7 on L293D high
    }
    // if the switch is low, motor will turn in the opposite direction:
    else {
        digitalWrite(motor1Pin1, HIGH); // set pin 2 on L293D high
        digitalWrite(motor1Pin2, LOW); // set pin 7 on L293D low
    }
}

Turn on your circuit and the motor will rotate to one direction. Press the button and the motor will rotate to the other side.

That it! Feel free to comment and post your thoughts. The Garage Lab is and open space to share knowledge and talk about electronics, open hardware, arduino and DIY stuff and hacking.

References:

http://luckylarry.co.uk/arduino-projects/control-a-dc-motor-with-ar...

http://arduino.cc/playground/Main/InterfacingWithHardware

http://www.datasheetcatalog.org/datasheet/stmicroelectronics/1330.pdf

Views: 107459

Comment by Rahul Vyas on September 9, 2012 at 3:30am

Hi,

Need urgent help.
 I have a 12v motor which takes 4.55A current at full throttle. I want to control 2 of these motors with my reciever.

Check this link for the motor datasheet- http://www.pitsco.com/sharedimages/resources/DCDriveMotorSpecs.pdf

Also, Can this circuit be modified to control it with a RC reciever/transmitter?

Comment by Marcelo Rodrigues on September 9, 2012 at 7:47am

Rahul,

As the L293 can not drive so high current for your motors, you have to use another thing. I suggest you use an H-Bridge circuit like this one:

Image from http://wiki.mech.uwa.edu.au/index.php/Micro_crash_course/pwm

The idea is making the current flow through the load (motor) in the 2 different directions, making the motor spin to both directions, depending on what mosfets are active. You still can use PWM to control the speed.

Take a look at the article (link above) to understand how it works.

Good luck!

Comment by Ethan on November 3, 2012 at 3:28pm

I was woundering if you could use xbees to make this wireless.  Also can I do this with 2 motors and 1 arduino?  I need help! 

Comment

You need to be a member of GarageLab (arduino, electronics, robotics, hacking) to add comments!

Join GarageLab (arduino, electronics, robotics, hacking)

Latest Activity

Igor Golov is now a member of GarageLab (arduino, electronics, robotics, hacking)
Thursday
Marco is now a member of GarageLab (arduino, electronics, robotics, hacking)
Monday
Muhammad Ali commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Thanks for the advice. I will persist with the code till I get it done. thanks once again."
Apr 18
Marcelo Rodrigues commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
""The output waveforms on oscilloscope for Hsync and Vsync and for that matter RGB pins are not…"
Apr 17
Muhammad Ali commented on Marcelo Rodrigues's blog post Arduino generated VGA (color) signal - Complete!
"Hi  Marcelo I am trying to make this code work with Attiny 44a operating @ 20 MHz. I have…"
Apr 17
Profile IconReal NOiseux, Muhammad Ali, bob v and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Apr 17
baiqian is now a member of GarageLab (arduino, electronics, robotics, hacking)
Apr 10
Profile IconDavide and Almas Amandossov joined GarageLab (arduino, electronics, robotics, hacking)
Apr 6
Profile Iconvamoalrenga and John Ferrell joined GarageLab (arduino, electronics, robotics, hacking)
Apr 3
Marcelo Rodrigues replied to FiniousFingers's discussion New to group
"Yes, please share your progress here. Thanks and good"
Mar 27
FiniousFingers replied to FiniousFingers's discussion New to group
"Thanks, good to know someone is out there. I will be…"
Mar 27
Edward Evans replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Have you moved forward with any action?  I would be interested in discussing your…"
Mar 27
Marcelo Rodrigues replied to GarageLab's discussion Serious claims against BeagleBone's manufacturer CircuitCo
"Ed, No, they didn't deliver yet.  :( Good luck for us all."
Mar 23
Profile IconWesenachin Asfaw and Muhammad Basil joined GarageLab (arduino, electronics, robotics, hacking)
Mar 23
Marcelo Rodrigues replied to FiniousFingers's discussion New to group
"Hey man! A good point to start is reading basic tutorials on Arduino coding and wiring. Then, you…"
Mar 23
FiniousFingers posted a discussion

New to group

Couple quick things,I am just starting to learn, or wanting to learn, how to use the Arduino UNO…See More
Mar 23
Profile IconDan Urbauer, Bjorn and Jiaming Zhao joined GarageLab (arduino, electronics, robotics, hacking)
Mar 22
FiniousFingers is now a member of GarageLab (arduino, electronics, robotics, hacking)
Mar 20
Erva updated their profile
Mar 16
Erva and Mrs. Priscilla Bonneval are now friends
Mar 16

© 2017   Created by Marcelo Rodrigues.   Powered by

Badges  |  Report an Issue  |  Terms of Service