In order to take input from the button at any time, since the state change is instantaneous (as opposed to the photoresistor, which produces continuous digital input), an interrupt was attached to the button pin in order to detect when it was pressed. This necessitated additional delay calls in order to keep the notes on time with other parts of the code.Ī light threshold was generated during setup in order to determine when the box would be open (bright) and closed (dark) in order to play and pause the song. To actually output the sound from the piezo, the tone function was used, which handles the tone duration with its own independent timer. Finally, these arrays of notes and rhythms could be iterated through on a step-by-step basis, which allowed for the integration of visual outputs, such as light and lyrics. The full song was divided into the intro, first verse, and chorus, which were set to play in the following order indefinitely: chorus, first verse, chorus, intro, intro, first verse etc. A gap 30% of the length of the previous note was introduced to create space between notes.
All frequencies required for the song were defined at the beginning of the code.įor the rhythm of the song, relative durations of notes were stored in arrays, and these durations were later multiplied by a constant beat length in order to determine the full duration of the note. This is how the Piezo outputs noise it generates sound at specified frequencies to create a pitch. In the code, these notes were stored in arrays as their respective frequencies, i.e. The rhythms were determined by counting and clapping out the song to a consistent set of beats. The notes were determined by listening to the song and matching them on the piano. In order to play music, the song first had to be transcribed into a form that could be interpreted in code. Circuit connections shown outside of box for clarity.
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