Section outline

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      Assignment 4 - Sound


      New parts: Speaker, CdS photoresistor, 10k Resistor (Br, Bl, Or, Gold)

      In Class:

      coil

      How a speaker works.

      Review Resistor Circuits:

      Current Limiting, Pull Down, Voltage Divider (Potentiometer), Pull Up

      See How a light sensitive resistor can create "Music":

       Examples - Basic - AnalogReadSerial -Determine range of A0 

        Examples - Digital - TonePitchFollower- Adjust to Pin 8 - Adjust to range of A0

       * 8-ohm speaker on digital pin 8 and Gnd

       * photoresistor on analog 0 to Gnd
       * 10K resistor (brown, black, red)  on analog 0 to 5v


      circuit

      Assignment:

      Write a program (sketch) that plays a song.

      Use the following as a guide:

      C Scale

      Note Values


      Table of Musical Frequencies
      Note Frequency Note Frequency Note Frequency
      C 130.82 C 261.63 C 523.25
      C# 138.59 C# 277.18 C# 554.37
      D 146.83 D 293.66 D 587.33
      D# 155.56 D# 311.13 D# 622.25
      E 164.81 E 329.63 E 659.26
      F 174.61 F 349.23 F 698.46
      F# 185 F# 369.99 F# 739.99
      G 196 G 392 G 783.99
      G# 207.65 G# 415.3 G# 830.61
      A 220 A 440 A 880
      A# 233.08 A# 466.16 A# 932.33
      B 246.94 B 493.88 B 987.77

      Treble and Bass Clefs

      Chromatic Scale - Link

    • Arduino Code to play the Chromatic Scale