Schematic here: https://www.raspberrypi.org/wp-content/uploads/2015/08/Sense-HAT-V1_0.pdf jdb, many thanks for the schematic. I figured that the 3 pins that are used by Witty Pi (7, 8, 11) are free and hence part of the questions has been answered. Since Sense HAT also uses I2C can you help with th...

I'm thinking of getting a WittyPi to be stacked along with the Astro Pi. The WittyPi has an RTC and a power management system that allows the Pi to be started up using a push button or according to a script with a schedule. According to the makers of the WittyPi (www.uugear.com), the HAT uses the GP...