Sound Meter

Last week, we only used Arduino board as a power source, but the real power of the board is its ability to control input and output. We can write codes and upload to the board, plug in a sensor, and then a processor calculates our codes and output signals through digital and analog input/output (I/O). Sensors are like sense organs, reading signals in the physical world, and a processor is like the brain of Microcontroller, usually does only one task, like listening to sensors. The difference between digital and analog I/O is that digital signals have two states, ON (binary 1) or OFF (binary 0), while analog signals are variable.

In this week, I made a sound meter with LEDs to detect the level of sound, and the amount of LEDs would be illuminated accordingly. The louder the sound, the more LEDs emit.

The sound meter prototype
The final result

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