This circuit will control a "stop-light" made of LEDs located in the center of the rear-window of a car.

There are two wires powering the "stop-light". Only 0V is constant and V+ comes when you go on the brakes.

My first idea was to install a third permanent V+ wire but the engineers from RENAULT made things not a simple way and it is almost impossible to do so .

Function of the circuit: when I go on the brakes, all LEDs light-up.

If I go on the brakes a second time:
- more than half a second later (> 0,5s), all LEDs will light-up again;
- less than half a second later (< 0,5s - or, if I go a second time on the brakes within half a second), I will activate a function that makes my LEDs scroll.