Click to the pictures to entlarge

counter01.jpg (46296 bytes) The counter in action  counter06.jpg (94418 bytes) Box with the connector.

On the connector the reset and reverse button.
counter05.jpg (93612 bytes) The disk mount with some magnets  counter04.jpg (106246 bytes) The sensors 
counter.jpg (179117 bytes) Schematic  img628.jpg (128930 bytes) PCB and components 
Rotation disk    Layo1 PCB