This is one of the rp2040 controllers It | adafruit | Page 1

cedar heath Jun 23, 2023, 2:08 PM

#

Very cool project! Could you get away with using a capacitor to handle the inrush current? That was my solution for a giant LED project I was doing

#

I guess for motor control, you'd want to limit the "charging" current since a large cap / bank of them is essentially a short-circuit on the battery in terms of discharge rate

dull imp Jun 23, 2023, 2:21 PM

#

Capacitors actually are the problem. My battery's internal protection will allow a maximum of 25 amps for a brief period of time. The voltage drops out long enough for my raspberry pi to reboot. I even tried a capacitor at the 5 volt supply. What does work is precharging the capacitors using a 4 ohm resistor. The pico switches a MOSFET and then engages a mechanical relay. I'm sure there is a more elegant way to do this.

cedar heath Jun 23, 2023, 2:22 PM

#

Hey that's a cool solution, using the mosfet to just allow full throttle after the pre-charge

#This is one of the rp2040 controllers It