I have ACM board 1.0. I try connect to usb only if my battary is also connected.
Usally one of my motors (front in Hexa+) will start to spin shortly.
I have ACM board 1.4 the motor burned is the front in my Hexa +
Sometimes when I connect the Hexa to CLI or APM one of motors fuming with Ardu Pirates and Arducopter but it never had burned.
Hi, one of my motors also burned some time ago during the setup process. That may be some kind of command that the autopilot send to the ESC that causes the motor to spin sometimes back and forth.
That happened twice to me, so no coincidence (second time I was able to save the motor). What I do now is always before plugging the USB cable to my computer I remove the power to Ardu board (my esc powers the board).
unfortunately, I have not been successful in getting the DIYdrones ESCs in stock !!
A friend suggested these to me as an alternative-
Again my issue only occurs during intial USB communication (with battery connected). It does not occur when I am using the Xbee's