Therefore, every time a clapping sound is detected, there is a sudden peak arising at the collector voltage.Ĭonfiguring the internal comparator module of PIC12F683

Since the condenser mic’s output voltage is coupled to the base of the transistor through capacitor C1, the base-emitter voltage is also lowered and as such the base-emitter junction is less forward biased or cutoff (in case of high clap sound). When the mic detects a clap sound, the voltage across it drops suddenly. When there’s no sound, the collector voltage (Vout) of the transistor, which is saturated, is approximately 0.2V. The following circuit diagram shows the mic along with a single transistor amplifier. The output from the mic is very low in magnitide and so we need an amplifier circuit to boost the detected sound signal. An electret microphone or simply mic (OBO-04FN-0B) is used for this purpose. The clap switch requires a transducer at the input to convert sound vibrations from clapping hands into electrical energy. Simple clap switch using a condenser mic and PIC microcontroller

Clap switch altium designer download