Can I use my Raspberry Pi to provide the PWM controlling my ESC, but have the ESC powered by a separate battery?
The ESC I'm using is "A1S 3A Blheli 1S Super Mini Brushless ESC". It's awesome. And it works when I connect the ESC wires to the Pi's GND and 5v/3.3v supply. A Tiny ESC for a Tiny motor.
But it doesn't seem to work when I connect the ESC to a separate battery. I think the battery's GND isn't exactly the same as the Pi's GND, thus the Pi's PWM signal isn't compatible with the battery's power supply.
The battery is a 7.4V 250mAh 2S 20C LiPo regulated by a UBEC (RipaFire 5V 3A UBEC)
Maybe I can power both the Pi and the ESC from the same battery+UBEC so they share the same GND? Before I try that I'd like to see if I'm doing things wrong.