transistors q1 and q2 are turned on by default when the bbb wakes up (before running beagleg) with about 2.5v on their gates, which is a problem as it would activate heaters.
This is despite a 100k resistor to ground on each gate. i recommend choosing a different GPIO pin for each, something that defaults to logic LOW for these important signals.
also, the silkscreen outline of transistors q1 and q2 is backwards, although the pin labeling of GDS is not backwards.
also, a 4.7k resistor from the !enable line of the stepper controllers to the 3v3 line is needed, to prevent the motors turning on momentarily as the beaglebone shuts down.
transistors q1 and q2 are turned on by default when the bbb wakes up (before running beagleg) with about 2.5v on their gates, which is a problem as it would activate heaters. This is despite a 100k resistor to ground on each gate. i recommend choosing a different GPIO pin for each, something that defaults to logic LOW for these important signals.
also, the silkscreen outline of transistors q1 and q2 is backwards, although the pin labeling of GDS is not backwards.
also, a 4.7k resistor from the !enable line of the stepper controllers to the 3v3 line is needed, to prevent the motors turning on momentarily as the beaglebone shuts down.