#define led 7
#define sw1 11
#define sw2 12
#define sw3 13
#define btn 8
int val1;
int val2;
int val3;
int note;
int btnVal;
int btnState;                // variable to hold the last button state
boolean playMusic=false;
int playVal;

char names[] = {'c', 'd', 'e',
     'f', 'g', 'a', 'b', 'C',' '};  
int tonesStart[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 };
int tonesEnd[] = { 1905, 1690, 1509, 1422, 1265, 1126, 1004, 946 };

void setup(){
  pinMode(led,OUTPUT);
  pinMode(sw1,INPUT);
pinMode(sw2,INPUT);
pinMode(sw3,INPUT);
pinMode(btn,INPUT);
  Serial.begin(9600);
  btnState=digitalRead(btn);
}
void loop(){
  btnVal=digitalRead(btn);
  if(btnVal!=btnState){
    
    if(btnVal){
      playMusic=!playMusic;
    }
  }
  if(playMusic){
  val1=digitalRead(sw1);
  val2=digitalRead(sw2);
  val3=digitalRead(sw3);
  
//using the arduino guide above construct your if statements
	// If all buttons are pressed, then note is c
	if (val1 && val2 && val3) { 
		note=0;
	}
	// If the first and third buttons are pressed, then note is d
	else if (val1 && !val2 && val3) { 
		 note=1;
	}
	//continue for all combinations
	else if (val1 && val2 && !val3) {
  note=2;
	}
	//continue for all combinations
	else if (val1 && !val2 && !val3) {
  note=3;
	}
	//continue for all combinations
	else if (!val1 && !val2 && !val3) {
  note=4;
	}
	//continue for all combinations
	else if (!val1 && !val2 && val3) {
  note=5;
	}
	//continue for all combinations
	else if (!val1 && val2 && !val3) {
  note=6;
  
	}
	//continue for all combinations
	else if (!val1 && val2 && val3) {
  note=7;
	}
	
//print the note in the serial monitor
Serial.println(note);

//turn the speaker on, delay the appropriate amount of microseconds
digitalWrite(led,HIGH);
delayMicroseconds(tonesStart[note]);//turn the speaker off and delay the appropriate amount of microseconds
digitalWrite(led,LOW);
delayMicroseconds(tonesEnd[note]);
//turn the speaker off and delay the appropriate amount of microseconds
  }else{
    digitalWrite(led,LOW);
  }
	btnState=btnVal;
}