Module 18 // Audio Synthesis

Electronic Piano

Integrates tactile switch matrix logic gates to trigger musical frequency generation when keypress values narrow down. The Arduino converts button inputs into piano notes through a piezoelectric speaker.

Piano Key Mapping

Input Key	Vector Mapping	Target Uno Pin
DO Button	====>	Digital Pin 2
RE Button	====>	Digital Pin 3
MI Button	====>	Digital Pin 4
Piezo Speaker	====>	Digital Pin 8

Audio Firmware


const int buzzer = 8;

void setup()
{
 pinMode(2, INPUT_PULLUP);
 pinMode(3, INPUT_PULLUP);
 pinMode(4, INPUT_PULLUP);
}

void loop()
{
 if(digitalRead(2)==LOW)
 {
  tone(buzzer,262);
 }
 else if(digitalRead(3)==LOW)
 {
  tone(buzzer,294);
 }
 else if(digitalRead(4)==LOW)
 {
  tone(buzzer,330);
 }
 else
 {
  noTone(buzzer);
 }
}