Ever wanted to make something that could be controlled with sound? Like, controlling the ON/OFF state of a LED by clapping, or changing the turn direction of a remote controlled car by producing sound. Well, all of this is possible through this amazing sensor. A sound detector module is used to detect sounds and use them as inputs to carry out specific functionalities. This module consists of a sensitive capacitance microphone for detecting sound and an amplifier circuit. The output of this module is both analog and digital. The digital output acts as a key, and it activates when sound intensity has reached a certain threshold. The sensitivity threshold can be adjusted via the potentiometer on the sensor. The analog output voltage changes with the intensity of sound received by the microphone. You can connect this output to Arduino analog pins and process the output voltage.
A sound sensor consists of a voltage comparator IC, power LED, sound detect LED, microphone and a 10k pot. It has 4 pins, namely:-
1. VCC – Power
2. GND – Ground
3. D0 – Digital Output
4. A0 – Analog Output
Specifications
1. Operating voltage: 3.5V
2. Operating current: 4~5 mA
3. voltage gain: 26 dB
4. sensitivity of the microphone: 52 to 48 dB
5. impedance of the microphone: 2.2k Ohm
How to use
Tutorial – ( )
https://lastminuteengineers.com/sound-sensor-arduino-tutorial/
Common Applications
1. Used in sound control remote control cars.
2. Used in home automation.
3. Used in general sound detection.
Some example projects that students can try out in the ATL Lab
1. Make a system to detect sound using arduino and sound sensor – ( )
https://automationroboticsarduino.com/pages/how-to-use-the-sound-detection-sensor-with-arduino
Safety Measures to follow
1. The sensor might not work properly in noisy areas. For that, selective sound proofing can be done depending on the environment.
Important Links
1. Controlling an LED using a sound sensor – Link – https://mytectutor.com/how-to-make-a-clap-switch-using-a-sound-sensor-and-arduino/
