This PCB will allow you to build a lap counter for your slot car track.

This was designed to be used with an arduino at 3.5v

Should work at 5v but not tested.

There is a line in for high to low break.

If your sensor is high (3 to 5 v) and drops to zero when the car breaks the sensor use this.

There is also a line in for low to high break.

If your sensor is low (zero) and jumps to High (3 to 5 v) when the car breaks the sensor use this.

input diagram (Left to right, Top to bottom)

Pin 1 Pin 2 Pin 3

vcc (3v) Data(H to L break) reset (high to reset)

Pin 4 Pin 5 Pin 6

Ground Data(L to H break) Not Used

This is for the PCB only. Components must be purchased separately.

This project is for educational purposes, no guarantee of unforeseen issues.