What Pi GPIO pins does the GrovePi use?

Hi, I just ordered a GrovePi for my robotics project.
I need to know which Raspberry Pi GPIO pins the GrovePi uses.

I already have a MC33926 Dual Motor controller.

I was planning on using the Raspberry Pi GPIO-18 for the
PWM speed control on the motor, plus 4 other digital output
ports for direction control on the motors.


Hi Paul,
GrovePi uses the I2C pins for communicating with the Raspberry Pi (GPIO 0,1 in Rev 1 and GPIO 2,3 in Rev 2).

The SPI pins are also used when updating the firmware, so you can use all the pins except the I2C pins.