Code and circuit diagram for musical keyboard / akshit innovation lab

// Musical Keypad

//life time skills https://www.youtube.com/channel/UCvqrugW02HjKbGUE2bw0muw

#define c3 9

#define c2 8

#define c1 7

#define c0 6

#define r3 5

#define r2 4

#define r1 3

#define r0 2

void setup() {

Serial.begin(9600);

pinMode(c0,INPUT_PULLUP);

pinMode(c1,INPUT_PULLUP);

pinMode(c2,INPUT_PULLUP);

pinMode(c3,INPUT_PULLUP);

pinMode(r0,OUTPUT);

pinMode(r1,OUTPUT);

pinMode(r2,OUTPUT);

pinMode(r3,OUTPUT);

pinMode(11,OUTPUT);

}

void loop()

{digitalWrite(r0,LOW);

digitalWrite(r1,HIGH);

digitalWrite(r2,HIGH);

digitalWrite(r3,HIGH);

if(digitalRead(c0)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=119;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c1)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=106;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c2)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=94;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c3)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=89;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

digitalWrite(r0,HIGH);

digitalWrite(r1,LOW);

digitalWrite(r2,HIGH);

digitalWrite(r3,HIGH);

if(digitalRead(c0)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=79;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c1)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=71;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c2)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=63;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c3)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=59;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

digitalWrite(r0,HIGH);

digitalWrite(r1,HIGH);

digitalWrite(r2,LOW);

digitalWrite(r3,HIGH);

if(digitalRead(c0)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=25;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c1)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=20;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if (digitalRead(c2)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=10;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c3)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=50;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

digitalWrite(r0,HIGH);

digitalWrite(r1,HIGH);

digitalWrite(r2,HIGH);

digitalWrite(r3,LOW);

if(digitalRead(c0)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=50;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c1)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=50;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c2)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=50;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

else if(digitalRead(c3)==LOW){

TCCR2A = B01000011;

TCCR2B = B00001110;

OCR2A=50;

delay(100);

TCCR2B=B00001000;

TCCR2A = B00000000;

digitalWrite(11,LOW);}

}