CODESYS Christmas lights - Raspberry Pi
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Use the Webvisualisation on your mobile phone to switch on the lights BOM:
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: https://forum.codesys.com/viewtopic.php?f=23&t=6247&p=19944#p19944
This example shows how to use a port-expander PCF8574 I2C without library/device description
from the application code.