/*

‍Voltaat learn (http://learn.voltaat.com)

Tutorial: How_to_make_a_piano_using_Arduino!

Connections from the Arduino to the breadboard:

• Arduino 5v pin → breadboard 5v line

• Arduino GND pin → breadboard GND line

Connections from the buzzer:

• The positive terminal of the speaker → Pin 10 on the Arduino board

• The negative terminal of the speaker → Negative terminals on the breadboard

Connections from the switches:

• The right terminal of the first switch →  Arduino pin 2

• The left terminal of the first switch → Negative terminals on the breadboard

• The right terminal of the second switch → Arduino pin 3

• The left terminal of the second switch → Negative terminals on the breadboard

• The right terminal of the third switch → Arduino pin 4

• The left terminal of the third switch → Negative terminals on the breadboard

• The right terminal of the fourth switch → Arduino pin 5

• The left terminal of the fourth switch → Negative terminals on the breadboard

• The right terminal of the fifth switch → Arduino pin 6

• The left terminal of the fifth switch → Negative terminals on the breadboard

• The right terminal of the sixth switch → Arduino pin 7

• The left terminal of the sixth switch → Negative terminals on the breadboard

• The right terminal of the seventh switch → Arduino pin 8

• The left terminal of the seventh switch → Negative terminals on the breadboard

• The right terminal of the eighth switch → Arduino pin 9

• The left terminal of the eighth switch → Negative terminals on the breadboard

*/

// Define push button pins

const int buttonC = 2; // C4 (Do)

const int buttonD = 3; // D4 (Re)

const int buttonE = 4; // E4 (Mi)

const int buttonF = 5; // F4 (Fa)

const int buttonG = 6; // G4 (Sol)

const int buttonA = 7; // A4 (La)

const int buttonB = 8; // B4 (Si)

const int buttonC5 = 9; // C5 (Do, octave higher)

const int speakerPin = 10; // Speaker output pin

void setup() {

  // Set up button pins as input with pull-up resistors

  pinMode(buttonC, INPUT);

  pinMode(buttonD, INPUT);

  pinMode(buttonE, INPUT);

  pinMode(buttonF, INPUT);

  pinMode(buttonG, INPUT);

  pinMode(buttonA, INPUT);

  pinMode(buttonB, INPUT);

  pinMode(buttonC5, INPUT);

  digitalWrite(buttonC, HIGH);

  digitalWrite(buttonD, HIGH);

  digitalWrite(buttonE, HIGH);

  digitalWrite(buttonF, HIGH);

  digitalWrite(buttonG, HIGH);

  digitalWrite(buttonA, HIGH);

  digitalWrite(buttonB, HIGH);

  digitalWrite(buttonC5, HIGH);

  pinMode(speakerPin, OUTPUT); // Set speaker pin as output

}

void loop() {

  // Play notes corresponding to buttons

  if (digitalRead(buttonC) == LOW) {

    tone(speakerPin, 261); // C4 (Do)

  } else if (digitalRead(buttonD) == LOW) {

    tone(speakerPin, 294); // D4 (Re)

  } else if (digitalRead(buttonE) == LOW) {

    tone(speakerPin, 329); // E4 (Mi)

  } else if (digitalRead(buttonF) == LOW) {

    tone(speakerPin, 349); // F4 (Fa)

  } else if (digitalRead(buttonG) == LOW) {

    tone(speakerPin, 392); // G4 (Sol)

  } else if (digitalRead(buttonA) == LOW) {

    tone(speakerPin, 440); // A4 (La)

  } else if (digitalRead(buttonB) == LOW) {

    tone(speakerPin, 493); // B4 (Si)

  } else if (digitalRead(buttonC5) == LOW) {

    tone(speakerPin, 523); // C5 (Do, octave higher)

  } else {

    noTone(speakerPin); // Turn off the tone if no button is pressed

  }

}

‍