112 Learn-about-signal-processing
http://txplo.re/2gwsTjS

113 Sketch-on-Github
http://txplo.re/2eliR7v

113 More-about-audio-signal-processing
http://txplo.re/2g8bcds

113 Learn-about-loudness
http://txplo.re/2fUaCNw

114 Sketch-on-Github
https://github.com/futureshocked/ArduinoSbS2017/blob/master/_0560_-_Digital_sound_sensor/_0560_-_Digital_sound_sensor.ino