Introduce sound sensors and actuators
Sound sources can come from human, animal, car, and so on . To process sound data, we should capture the sound source from physical to digital form. This happens if we use sensor devices which capture the physical sound source. A simple sound sensor is microphone. This sensor can record any source via microphone.
We use a microphone module which is connected to your IoT board, for instance, Arduino and Raspberry Pi. One of them is Electret Microphone Breakout, https://www.sparkfun.com/products/12758. This is a breakout module which exposes three pin outs: AUD, GND, and VCC. You can see it in the following figure.
Furthermore, we can generate sound using an actuator. A simple sound actuator is passive buzzer. ...
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