Hi ,
this is a schematic I use in my OFM to get rid of additional power supply if you don’t use the sangaboard.
Just power motors and Arduino by the RASPI GPIO port.
All you need is a Zener diode 5.1V against overvoltage from outside or negative power by induction of the motors and a polyfuse 900mA to protect the Raspi against overpower (e.g. shortcuts) .
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