1. Plays up to 5 notes associated with a push-button each (starting from C);
2. Features 2 extra buttons for going up or down an octave.

1. Arduino Uno R3;
2. Breadboard;
3. 1 LED;
4. 1 220Ω resistor;
5. 5 small + 2 bigger push-buttons;
6. Buzzer.

Project Design:

1. Arduino IDE;
2. Set button frequencies for up to +1 and down to -1 octaves;
3. Increments and decrements an int for each octave step and enters each case with their respective frequencies.