/**
Mini piano for Arduino
Copyright (C) 2021, Uri Shaked
Released under the MIT License.
*/
#include "pitches.h"
#define SPEAKER_PIN 8
const uint8_t buttonPins[] = { 12, 11, 10, 9, 7, 6, 5, 4 };
const int buttonTones[] = {
NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4,
NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
const int numTones = sizeof(buttonPins) / sizeof(buttonPins[0]);
void setup() {
Serial.begin(9600);
for (uint8_t i = 0; i < numTones; i++) {
pinMode(buttonPins[i], INPUT_PULLUP);
}
pinMode(SPEAKER_PIN, OUTPUT);
}
int pitch = 0;
void loop() {
int newPitch = 0;
for (uint8_t i = 0; i < numTones; i++) {
if (digitalRead(buttonPins[i]) == LOW) {
newPitch = buttonTones[i];
}
}
if (pitch != newPitch) {
pitch = newPitch;
tone(SPEAKER_PIN, pitch);
}
}