Arduino gets very hot when connected to CNC shield

Other Hardware Motors, Mechanics, Power and CNC
1

Hi, I am a beginner to electronics and I have a problem where both of my Arduino Uno get really hot when connected to the CNC shield V3 despite the CNC shield is not connected to any 12 v 2 amps power supply. The Arduino's do not get hot when connected to the USB alone (only when connected to CNC shield) I don't know if this has anything to do with the fact that yesterday I connected the CNC shield to a 12 v 2 amps power supply adapter with a female barrel connector that I attached to some jumper wires which I then attached the CNC shield. Im not sure if this damaged it. I anyone has had experience with this and has a solution could you please let me know. I would appreciate any help. Thank you!

edit: turns out the servo motor wires were reversed. Reminder to everyone including myself, always double check connection before you assume something is wrong with the arduino itself.

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I have used the CNC shields a lot and have not had any problems of that sort.

What component on the Uno gets hot?

Is any thing connected to the CNC shield (stepper drivers, limit switches, spindle control, etc.)?

Did you, by any chance, connect the 12V backwards?

3

The Arduino gets hot even when the CNC shield is not connected to 12 v and the area that gets hot is between the power jack and USB port. It gets hot when connected to the computer and unpowered CNC shield. Connected to the shield are two stepper motors.

4

That is the area where the Uno's 5V regulator is located. If the Uno is powered by USB the regulator should not get hot because it is bypassed.

Is the Uno powered by USB during those tests?

Does the Uno get hot if the Uno is powered by USB and the unpowered CNC shield is connected?

Does it still happen if you remove the stepper drivers from the CNC shield?

5

Turns out the power and ground wires of the servo motors were reversed. I have fixed the problem and it works now. Nonetheless thank you for helping.

6

What servos? I asked if anything else was connected to the CNC shield and you said only stepper motors.

7

Oh sorry, I just checked and yes your right I forgot to mention the servo motor as I have never had any problems with them before so I must have thought somethings was wrong with the steppers which I have problems with most of the time.

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