Made a new php based remote 'webapp' for my phone. It allows me to control the lights, and the central ventilation system. See the project pictures for a screenshot.
The ventilation system is also triggered by a cronjob. It will shut off at 23.00, and start venting again around 11.00 in the morning.
The rest of the system is still working like a charm. Sometimes I lose a pi, but the backup nodes will take its place, and everything is well. : )