Hacks

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Use the Webvisualisation on your mobile phone to switch on the lights.

Hardware: Raspberry PI
Software: CODESYS Development System / Pi Package from CODESYS Store
Android App: https://play.google.com/store/apps/details?id=com.codesys.webview
CODESYS Project is available here: http://forge.codesys.com/hax/blog/_discuss/thread/4f238366/9b18/attachment/Weihnachtskrippe.project

This example shows how to use a port-expander PCF8574 I2C without library/device description
from the application code.