It will switch on when it becomes dark and switches off around midnight. It is a self-learning system and it calculates how long it has to stay on after it gets dark. This is not really made by me, but build together. It consists of a Conrad DCF-77 module in combination with excellent software from Hendrik Mienert . It consists of some ONER modules with a better receiver and a very simple frequency counter based up ZEFI .
Pictures are available here .
Automatic fan For bathroom and toilet, I developed a power controlled timer which controlles a fan. When light will be switched off, fan starts and switches off after certain time, depending on which room was left. When toggling the light switch for a brief moment, the fan also starts for a given time. Detailed information can be found at the excellent site of Tim Laren . If everything works out well, then my little GPS program should be listed on his site as well.