“Clap Switch” simply refers to a switching system whose switching mechanism depends on clapping of our hand. At one clap switch is on and at another clap switch is off. We can turn on or off any electrical equipment with a simple clap. Clap Switch project has been very famous project for first year Electrical and Electronics students of Kathmandu University since it is very simple but requires knowledge of lots of components. One has to use sensor, operational amplifier, filp flop, timer, relay, transistor, etc; looks like whole electronic knowledge is required. The block diagram of our project was as follows.
Our system consists of a microphone which is a clap sensor. The sound of the clap detected by the microphone is sent to the comparator (OP-AMP 741) which compares inverting and no inverting voltages and sends the higher signal to the 555 timer. Now, the signal received by the 555 timer (monostable mode) is converted to a single square wave for a certain time interval. The signal from the 555 timer is sent to the flip flop circuit (IC 4013 DUAL D), which gives logic for the switching. It holds the high signal constantly even after discontinuing the clap and holds low signal when clapped again. The constant signal is feed to the relay which is a switching device. Once the switch gets on triggered by the clap we can lit up the lamp and it gets switched off when again clapped.
The circuit diagram is as follows.
Hope this content may help first year engineering students.
(Please don't try to copy this circuit, try to understand electronics behind it. If you become able to understand all electronics behind this, you can design you own circuit diagram.)
What about its range?
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