HI! I'm building a Bluetooth car for college and I have a problem. This car is using an Arduino UNO with an L293D shield, handling 4 DC motors at a time. However, all 3 motors are working ok and nothing happens. But when this 4th motor is connected the L293D ic gets really hot in a matter of 1-3 seconds of usage.
Does anyone know if the motor is broken? Can this be fixed without buying another one?
You can easily test the motor by directly connecting it to the motor power supply. What current is being drawn by each motor? The L293D is specked at "The L293D is designed to provide bidirectional drive currents of up to 600-mA at voltages from 4.5 V to 36 V.". That is EACH motor current.
What are you using to power the motors?
Please post a link to the datasheet.
Hi! I am using 4 18650 batteries to power the project
Hello! For the motor or the entire circuit?
The motor please.
In series or parallel? Series is 14.8 volts, way too much for your motors. If in parallel, then 3.7 volts may make your motors turn.
What have you found when you tried the questionable motor directly without the controller? Did it turn?
Fine, thanks.
That motor should not make the driver upset.
Remark 1) Isn't that too much? 4 x 3.7 volt = 14.8 volt.
That gives each motor 11 - 12 volt. The current will be way too high then.
2 cells in serie ought to do something.
Remark 2). Disconnect all motors and connect that fourth one giving trouble, and watch the temperature of the driver. Is the motor turning or is it stuck, out of order?
Hi, @k0mi12
Welcome to the forum.
Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?
Hand drawn and photographed is perfectly acceptable.
Please include ALL hardware, component names and pin labels.
Can you please post images of your project so we can see your hardware layout?
Thanks.. Tom... 
I tried only connecting the 4th motor and it worked like the other ones, however. It slowed down after 1-2 seconds
Hi,
Can you please post a link to data/specs of the driver board?
Does it have a jumper on it for external/internal supply?
Can you please post your code?
I hope you have written your code in stages and have code JUST for testing the motors?
To add code please click this link;
Do you have a DMM?
Thanks.. Tom..
Here it is: https://5.imimg.com/data5/PX/UK/MY-1833510/l293d-based-arduino-motor-shield.pdf
And yes it contains a PWR jumper and yes I have a DMM
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