when I mount the BrickPi3 on my Pi then a yellow LED is flashing (between GPIO header and the Brickpi3 power plug, about 3-4 times/sec.):
what does that mean?
There is no red LED on at BrickPi3, just on the RaspberryPi…
(power switch is “on” but no external batteries attached because I don’t plug motors FTM)