LiteWatch by Bernd Felsche

Car Courtesy Light Control by Micro-Controller

Soft turn-off; fading to off.
Programmable delay and fade.
Switches off when engine is started.
Switches on light for programmable time when central-locking unlocks car.
Switches off courtesy light after programmable time when central-locking locks car.
Audible headlight reminder.
Audible and visual door-ajar warning when engine is started.
more...

Circuit Schematic - drawn using CadSoft Eagle.

Board Layout - routed manually with the help of CadSoft Eagle.
Actual board size approxmately 75mm by 45 mm.