These externals use the WiringPi GPIO access library for the Raspberry Pi. Written in C they provide faster access than python and the ability to embed it in Pd. Just like WiringPi, it’s released under the GNU LGPLv3 license.
To use them, put them somewhere where Pd can see unity 3d, either by adding it to preferences/path or with the [declare -path] object. You need to have sudo privileges to access the GPIO.
Download here from sourceforge.
author: Jaime Oliver La Rosa
updates:
version 0.1 fixes the ability to have two mcp3008 chips running at the same time with spi pins 0 and 1.