its possible the escs have low resistance protection resistors that require more driving current than a pixhawk can give. you could try a 3.3v-5v logic level shifter to boost the pixhawk pwm voltage.
its possible the escs have low resistance protection resistors that require more driving current than a pixhawk can give. you could try a 3.3v-5v logic level shifter to boost the pixhawk pwm voltage.