This is a simple circuit for hobbyists. Here i have made a 99 counter with IC's 4026. It counts one when the clock input is supplied with a high to low input, and so on. The clock input is really acting as a switch. So i converted this circuit in to a pushup counter by attaching an IR sensor to the clock input. The IR sensor has a range of 15 cm to 150cm, but only the sufficient clock input is generated by the IR sensor only when some reflective body comes close to it at-least 15cm's. That is the IR sensor acts like a touch-less switch.
Here is the circuit diagram
IR sensor packing
Package size : 29.5×13×21.6 mm
If this IR sensor is kept below your forehead, it will generate clock pulses for the counter when your head comes close to it.
Here is the circuit diagram
IR sensor packing
Package size : 29.5×13×21.6 mm
If this IR sensor is kept below your forehead, it will generate clock pulses for the counter when your head comes close to it.
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