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DIY Arduino Boards for IO using port expanders and I2C
DIY Arduino Boards PCF8674 MCP23017 74HC595 CD4021
I2C
Parallel IO
Piezo buzzers
See the Files section for a wide range of sensors and sample code
Schematics
PCB Layout
Sample Code
ParallelPort Control Made Easy - parashell allows control of a PC parallelport (input and output) with simple command line arguments. The simplicity of these programs make it very easy to use in scripts. Control stepper motors, Relays, LEDs, etc...
Mind this project is no longer maintained. You might be interested in having a look at
http://pythonhosted.org/plasduino/
instead.
Framework for data acquisition through the parallelport, suitable for performing simple didactic physics experiment.