I am trying to use the Adafruit Metro Mini as Arduino (can be used the same way) to program an IR Break Beam sensor and a stepper motor. I connected the beam sensor to the breadboard and plugged the Arduino into my computer. But my MAC pops up with the notification:

"USB Device Disabled - Unplug the device using too much power to re-enable USB Devices."

What is the problem causing the issue? Did I short circuit something? I attached photos to my circuit to the post.

enter image description here enter image description here

Thanks so much in advance.

  • 1
    "USD device"?? Are you sure that shouldn't be "USB device"? Does the problem still occur if you take the Metro Mini out of the breadboard?
    – per1234
    Commented Dec 7, 2017 at 8:45

1 Answer 1


The stepper motor driver is installed with the error (shifted) to the breadboard.

The electrolytic capacitor at the output of the voltage stabilizer in reverse polarity.

Power to Adafruit Metro Mini is put in inverse polarity ...

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