Help, I'm struggling to drive a simple ESC and brushless motor combination
with the Beaglebone. I've already spent 1/2 a day figuring out the right
arming sequence (caused by a +- 0.01 ms error in timing).
But once I arm the ESC, the Beaglebone shuts off immediately. Most of the
time, it shuts off right when it starts spinning up. Sometimes it even
shuts off on one of the beeps the motor makes indicating the ESC is arming.
Here's my setup:
Revolver Stubby motor
850W PSU =====12V===== ESC ===3.3V=== BeagleBone
The PSU is an Antec 850 high current gamer. I've disabled over-current,
over-voltage, and under-voltage protection on it, so the power draw can be
alot (enough to make the lights flicker when the motor starts).
The BeagleBone is powered by USB and should be buffered against surges
caused by the motor PSU.
What could be the problem?
Well, I've overcome the problem. I was using a GPIO as GND to the ESC. This
was convenient since those pins are next to each other. Once I used true
GND, then the problem went away.
But why would using a GPIO as a GND cause a shutdown? I know it will
restrict the amount of current sinked due to having to flow through an
It all depends on what the ESC current is. The current spec for GPIO
is not a suggestion, but an absolute maximum value; if you exceed it,
all bets are off (reset is actually a polite thing to do---permanent
pin buffer damage can also happen, as well as wider damage to the