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This device is used to count each step of a person either walking or running. This keeps track of a daily physical activity for sports and physical fitness enthusiasts encouraging oneself in getting fit and losing weight. A total of 10,000 steps per day, equivalent to 8 kilometres (5.0 mi), is recommended by some to be the benchmark for an active lifestyle.

This project uses a reed relay that uses an electromagnet to control its switch. The contact is of magnetic material and the electromagnet acts directly on it without requiring an armature to move it. A magnet and the reed switch are placed on each side of the person’s legs; switch it ON every time the person makes a step. The ICM7555 timer is used to act as a debouncing circuit making it sure that the produced signal is a clear pulse.

The pulses is inputted to the IC TC5001P 4-digit decimal counter designed to produce a BCD (binary-coded decimal) output with a maximum count of 9999. The Reset switch is connected to the reset pin of the TC5001P to reset the count back to 0000. The IC HEF4511BP is a BCD-to-7 segment latch/decoder/driver module; this is used to convert the BCD output from the TC5001P to drive the four 7-segment display panel. The BC337 transistors are connected to the common cathode of the 7-segments to act as a switch. T1, T2, T3, and T4 output pins of the TC5001P indicates the digit position of the BCD output signals corresponding in descending order from T1 to T4.