Using UltraBorg as a BLDC motors driver through PWM

It might be possible to drive a BLDC motor with built-in drive board, it depends on how it handles the PWM input. The servo signal / PWM outputs are at a fairly low frequency compared to many devices, this may or may not be a problem. The PWM signal is a 5V logic level, so the built-in drive board would need to support that as well.

The standard scripts are able to bypass the standard limiting logic and directly set the PWM output using the CalibrateServoPositionX calls. The values range from 0 for 0% to 65535 for 100%:

CalibrateServoPosition1(0)       # Output 1 - 0% duty (off)
CalibrateServoPosition2(6554)    # Output 2 - 10% duty
CalibrateServoPosition3(32768)   # Output 3 - 50% duty
CalibrateServoPosition4(65535)   # Output 4 - 100% duty (fully on)

The second and third parts are much more tricky. Some of the pins for the ultrasonic inputs could be re-purposed to read encoder feedback, but it would require significant changes to the UltraBorg's on-board logic to do this and the ultrasonic capability would also be lost.

Any changes to the UltraBorg on-board logic would require re-programming the PIC, which needs a programming device and a fair amount of knowledge of how the chip itself works. This is not an easy task if you have not worked with PICs before.

Put simply I think there is a good chance that the board is physically capable of doing what you need, but the feedback and control parts are a fairly difficult software project on their own.

Disclaimer: These are my personal thoughts on the idea, UltraBorg was not designed with this type of use in mind.