How to use two motors simultaneously with an Arduino uno

Please share your circuit connections and code..

This is the code I am using only for one motor:

int motorPin = 9;

void setup() {

  pinMode(motorPin, OUTPUT);

}

void loop()

{

digitalWrite(motorPin, HIGH);

}

I use a the set up below except I use pin9 instead of 3:

https://blogs.princeton.edu/humancomputerinterface/files/2013/03/breadboard.jpg

Thanks

You will need separate drive circuit (transistor and resistor) for both motor... u can use same code with two pin..

I tried that by using pin 3 for the second motor. I am assuming that my circuit is wrong. It would be nice if you could take a look I have attached it below.

Based on the diagram, you may be overloading the 5v rail of the arduino, it is not designed to supply the load to two motors. Try powering the motors from a desperate supply, only share a common ground between the motors and the arduino, alternately relaxed the two motors with LEDs and a 500r resistor between the led and 5v if this configuration works then it is you load from the motors

Sent from my iPhone

Peter's answer is the correct solution.

Ravi's answer is correct if, you apply Peter's logic. You need a separate power supply to provide enough current to drive the motors without destroying the Arduino. 

-Steve

Hi Ram,

If I want to control two motors, I will go for a driver circuit. One best solution is to use a motor driver IC. L293D is one of the inexpensive yet excellent ICs for this purpose. You will be able to pick up one form your nearest electronics shop for around Rs 60( if u r in India). I have used them in my robotics projects. Also this IC has protection circuits for back emf, so no worries about frying your arduino.

If you can dedicate two GPIO pins per motor, you will be able to control the motor in both directions. If you can afford only one GPIO, then you can ground the other input pin in L293D and control the motor with just start/stop functionality.

You can find a good tutorial about interfacing arduino with motors using L293D here ;

Control a DC motor with Arduino and L293D chip

Control your motors with L293D and Arduino

-vish

Dear: Ramgopal

I have used two dc motors with arduino uno before and I noticed a simular problem. See the problem is the board is over heating because two servos use a lot of power. So my suggestion for you is to either use a different brand of servos or use a different PCB. See if you have a heating solution you should be less likely to run into this problem. If you continue you could break your UNO board and your servos so be careful.

From: Noah

Thank you all. I will look at using another battery for powering the motors. Will also look at the L293D. I will get back if I am still facing issues

Ram

If you still have it, could you share the code? I am having the same issue.