There are 1000's of ways that you can make LED's react to sound and this here is definitely one of the simplest with the added advantage of being easy to modify and upgrade
Basically you plonk a mic module into pins A0-A3 and a RGB LED module into pins 8-11 (see diagram) then you upload one of the programs below that do the following
Program 1: MIC_RGB
Calculates loudness by taking consecutive readings and minusing one from another. Then it lights up the LED module in the following manner
low loudness = blue
mid loudness = green
high loudness = red
Program 2: MIC_RGB Bonanza
Calculates loudness then assigns 4 different ranges of intensity as a sound reaction using the random number function see code below:
NOTE: range applies to all colours
if (absLoudness ==2) Range of intensity = 0 - 10
if (absLoudness ==3) Range of intensity = 10 - 30
if (absLoudness ==4) Range of intensity = 20 - 45
if (absLoudness > 4) Range of intensity = 130 - 255
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