“You want to race with your Carrera slot cars, but have nobody who wants to play with you? So why don´t you race against an Arduino?
The challenge of slot car racing is to accelerate and brake the car just in the right moment. When we want to automate this by a microcontroller, we must know where the car actually is. Magnets which are fixed to the car´s wheels and hall effect switches around the track are therefore a perfect way to identify the position of the car: Whenever the car passes by a hall effect sensor, it sends an impulse to the Arduino.”