In this project, we will go over how to build a sound detector circuit.
A sound detector circuit, as you would probably know, is a circuit that can detect sound, such as talking, clapping, or shouting and indicates the level of the noise.
Based on this sound that the circuit detects, we can let anything happen in the circuit, such as have an LED light.
In this sound detector circuit which we will build now, we are going to use a micro controller, an Atmega 328 and LEDs to indicate when sound is detected.
Of course, we will use a microphone to be able to detect sound. But a microphone alone is insufficient for this circuit. This is because a microphone alone, without an amplifier, produces very small electrical signals. If we connected the output sound signals from a microphone directly into the pin of a controller, the board wouldn't be able to detect any meaningful signal, since it is so small. To be able to detect a signal that is large enough, the signal needs to be amplified first to be usable by the controller. Therefore, we must connect the microphone to an amplifier, have the signal amplified, and then connect the amplified signal into the controller.
So in order to build our circuit, we will use a microphone and connect it to an audio amplifier to get amplified signals. The amplifier IC will amplify the output signals that the microphone produces so that the controller will be able to detect large enough signals to interpret them.
See how it works;