We built Cardboard Electronic Pianos at the Queen Creek Library and Glendale Velma Teague Library. These are really basic with a single C scale using Arduino Nano, cardboard cut on the laser, copper tape, and a few wires. Removed a lot of complexity and left some room for upgrades to the code.
Below is the code for the piano. Could use some debounce, or the ability to play multiple notes.
#include "pitches.h"
int buttonState = 0;
int buttons[] = {
2, 3, 4, 5, 6, 7, 8, 9
};
int tones[] = {
NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
void setup() {
Serial.begin(9600);
pinMode(buttons[0], INPUT_PULLUP);
pinMode(buttons[1], INPUT_PULLUP);
pinMode(buttons[2], INPUT_PULLUP);
pinMode(buttons[3], INPUT_PULLUP);
pinMode(buttons[4], INPUT_PULLUP);
pinMode(buttons[5], INPUT_PULLUP);
pinMode(buttons[6], INPUT_PULLUP);
pinMode(buttons[7], INPUT_PULLUP);
//pinMode(11, OUTPUT);
//digitalWrite(11, LOW);
}
void loop() {
int keypressed = false;
for (int x = 0; x < 8; x++) {
buttonState = digitalRead(buttons[x]);
// Serial.print("button - ");
// Serial.print(buttons[x]);
// Serial.print(" - ");
// Serial.println(buttonState);
if (buttonState == LOW) {
tone(12, tones[x]);
delay(10);
keypressed = true;
break;
}
}
if (!keypressed) noTone(12);
// delay(1);
}
int buttonState = 0;
int buttons[] = {
2, 3, 4, 5, 6, 7, 8, 9
};
int tones[] = {
NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4, NOTE_C5
};
void setup() {
Serial.begin(9600);
pinMode(buttons[0], INPUT_PULLUP);
pinMode(buttons[1], INPUT_PULLUP);
pinMode(buttons[2], INPUT_PULLUP);
pinMode(buttons[3], INPUT_PULLUP);
pinMode(buttons[4], INPUT_PULLUP);
pinMode(buttons[5], INPUT_PULLUP);
pinMode(buttons[6], INPUT_PULLUP);
pinMode(buttons[7], INPUT_PULLUP);
//pinMode(11, OUTPUT);
//digitalWrite(11, LOW);
}
void loop() {
int keypressed = false;
for (int x = 0; x < 8; x++) {
buttonState = digitalRead(buttons[x]);
// Serial.print("button - ");
// Serial.print(buttons[x]);
// Serial.print(" - ");
// Serial.println(buttonState);
if (buttonState == LOW) {
tone(12, tones[x]);
delay(10);
keypressed = true;
break;
}
}
if (!keypressed) noTone(12);
// delay(1);
}
