PiFace products need the SPI pins on the Raspberry Pi to be enabled in order to function, this is simple enough to do. To enable the SPI, you must update to the latest version of the raspi-config tool, so open a Terminal and use the command
sudo apt-get install raspi-config
Y when required.
Now start raspi-config by typing
To view the list of advanced configuration options, select
Option 8 Advanced Options.
A5 SPI option. Set this to