Common functions for interacting with PiFace products.
http://pifacecommon.readthedocs.org/
You can also find the documentation installed at:
/usr/share/doc/python3-pifacecommon/
Make sure you are using the lastest version of Raspbian:
$ sudo apt-get update
$ sudo apt-get upgrade
Install pifacecommon with the following command:
Python 3:
$ sudo pip3 install pifacecommon
Notice 1: Installation from Raspbian repository with apt is not longer the preferred way, take a look into [https://github.com/piface/pifacecommon/issues/27#issuecomment-451400154](issue 27)
Notice 2: Python 2 support is "end-of-life" since Jan 2020, refer to https://www.python.org/doc/sunset-python-2/
You will also need to set up automatic loading of the SPI kernel module which
can be done with the lastest version of raspi-config. Run:
$ sudo raspi-config
Then navigate to Advanced Options, SPI and select yes.