Here is a simple touch control switch, I use IC 4011.
Logic HI at output is timer pulse delay control by C1
1S = C1 4.7uF(micro farad),
After touching the plate connected,so well pulse output.
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This 555 timer based PWM controller features almost 0..100% pulse width regulation using R1, while keeping the oscillator frequency relatively stable. The frequency is dependent on values of R1 and C1, values shown will give a frequency range from about 170 to 200 Hz. Any 555 chip will do, CMOS is fine as well. Diodes [...]
Max. range: 9,950 meters with two digits
Slip it in pants’ pocket for walking and jogging
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 [...]
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