Wiring Diagram

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DISTANCE COVERED DURING A WALK CIRCUIT SCHEMATIC DIAGRAM

This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants' pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) shows hundreds meters and its dot illuminates after every 50 meters of walking. A beeper (excludable), signals each count unit, occurring every two steps.

Note:

    * Experiment with placement and sloping degree of mercury switch inside the box: this is very critical.
    * Try to obtain a pulse every two walking steps. Listening to the beeper is extremely useful during setup.
    * Trim R6 value to change beeper sound power.
    * Push P1 and P2 to reset.
    * This circuit is primarily intended for walking purposes. For jogging, further great care must be used with mercury switch placement to avoid undesired counts.
    * When the display is disabled current consumption is negligible, therefore SW3 can be omitted.