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Blink Without Delay: Blink an LED without using the delay() function.
Button: Use a pushbutton to control an LED.
Debounce: Read a pushbutton, filtering noise.
Digital Input Pullup: Demonstrates the use of INPUT_PULLUP with pinMode().
State Change Detection: Count the number of button pushes.
Tone Keyboard: A three-key musical keyboard using force sensors and a piezo speaker.
Tone Melody: Play a melody with a Piezo speaker.
Tone Multiple: Play tones on multiple speakers sequentially using the tone() command.
Tone Pitch Follower: Play a pitch on a piezo speaker depending on an analog input.

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