Arduino reboots after pressing x button

[hoemph]

I found that the problem was my usb to power adapter when iin my pc no problem but it always happen on my power adapter

Originally posted by @fosterswat in #4 (comment)

I also had the problem on a usb-power-adapter that did not have enough current. So i modified my Arduino with a diode to prevent voltage drop on the microcontroller, when motor needs too much current