I fried my first Uno yesterday. Going to buy a new one but was hoping someone could give me advice on my circuit so I don’t fry the next one.
I constructed my circuit basically the same as in the attached image.The only extra inclusions were that I also had the USB power cable in and I had an IR reciever connected, Vs to +5v rail, G to ground and signal to an input pin.
I used an L293D IC h-bridge and two * 457-re360 6-15v DC motors, my external supply was first 6v, working great using PWM to control speed in forward and reverse, and then swapped for 15v (fried arduino with 15v supply after a few short uses).
I can take a coulple of guesses at what might have happened but I would be lying if I said I was sure what happened. After a bit of research (after the fact) I see that the bridge was under rated for the motors. And also that the motors starting and stall currents were a lot higher than I realised.
What I am looking for is a best guess on what went wrong and if possible a diagram and maybe a parts suggestion for safely powering these two motors and guarding against similar problems.