Just a simple question: anyone knows which Raspberry Pi GPIO pins the brickpi uses?
The BrickPi only uses the Serial Pins on the the Raspberry Pi GPIO to communicate with the Raspberry Pi. You can have a look at the schematic here https://github.com/DexterInd/BrickPi/tree/master/Hardware%20Design for more details.
So taken into account this thread and this one:
could one assume that the BrickPi and the GrovePi are compatible extension boards?
Thanks for all,
BrickPi and GrovePi are compatible. You can run both of them together.