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April 30, 2018

Learn: Measure Loudness with a Sound Meter

OVERVIEW

A sound meter lets you measure how loud a sound is.

PART 1: ASSEMBLE THE CIRCUIT

NOTE: See References in your manual for details on how to orientate the op-amp (LM358) and the polarised capacitor.

 

PART 2: VISUALISING DATA

STEP 1: Open this file and upload it to Arduino.

 

This sketch displays the value of A0 (microphone input) on the Serial Monitor. You should see a running display of numbers.

 

STEP 2: Close the Serial Monitor. You want to free up the pin for the Serial Plotter.

 

STEP 3: Open the Serial Plotter.

 

Make some sounds close to the microphone and see how the display changes.

 

PART 3: MEASURING THE SOUND LEVEL

STEP 1: Upload the following program into Arduino.

 

STEP 2: Open the Serial Plotter. Make some sounds and see how the value changes on the Serial Plotter.

 

PART 4: UNDERSTANDING GLOBAL/LOCAL VARIABLE AND LOOP

The program in Part 3 introduces local variables.

 

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