Breadboard Air guitar

#include "pitches.h"  //add note library



#define trigPin2 23 // pin for sending sensor #1 trigger signal 
#define echoPin2 22 // pin for receiving sensor #1 echo signal
#define trigPin1 25  // pin for sending sensor #2 trigger signal 
#define echoPin1 24  // pin for receiving sensor #2 echo signal


//digital pin 12 has a button attached to it. Give it an name
int buttonPin1= 12;
int buttonPin2= 11;
int buttonPin3= 10;



int buzzerPin = 8;



// defines variables
long duration1; // variable for the duration of sound wave travel
long duration2;
int distance1; // variable for centimeters measurement
int distance2; // variable for inches measurement

long d1;                  // sensor 1 distance
long d2;                  // sensor 2 distance
long t1 = 0;              // sensor 1 timestamp; initialize as 0
long t2 = 0;              // sensor 2 timestamp; initialize as 0
unsigned long start_time; // time since program start
float max_distance = 15;  // movement sensing range (in cm)
float min_distance =3;



void setup() {
  //make the button's pin input
  pinMode(buttonPin1, INPUT);
  pinMode(buttonPin2, INPUT);
  pinMode(buttonPin3, INPUT);
  


  pinMode(trigPin1, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin1, INPUT); // Sets the echoPin as an INPUT
  pinMode(trigPin2, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin2, INPUT); // Sets the echoPin as an INPUT
  //Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed

  start_time = millis();  // get program start time
}
void loop() {
  
//read the input pin
  int buttonState1 = digitalRead(buttonPin1);
  int buttonState2 = digitalRead(buttonPin2);
  int buttonState3 = digitalRead(buttonPin3);

  if (buttonState1 == 0 && buttonState2 == 0 && buttonState3 == 0) { // if left sensor triggered first
    noTone(buzzerPin);     // Stop sound...
  }

  // Clears the trigPin condition
  digitalWrite(trigPin1, LOW);
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin1, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration1 = pulseIn(echoPin1, HIGH);

  // Clears the trigPin condition
  digitalWrite(trigPin2, LOW);
  delayMicroseconds(2);
  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin2, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin2, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration2 = pulseIn(echoPin2, HIGH);

  // Calculating the distance
  distance1 = duration1 * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  distance2 = duration2 * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  
  
  
  d1 = distance1;
  d2 = distance2;

  // if either sensor distance drops below limit, record timestamp
  if (d1 < max_distance && d1 > 3) {
    t1 = millis();
  }
  else if (d2 < max_distance && d2 > 3) {
    t2 = millis();
  }

  if (t1 > 0 && t2 > 0) {       // if both sensors have nonzero timestamps
    if ((t1 < t2)) { 
      noTone(buzzerPin);   
      //Serial.println("Left to right");    // direction is left to right  
      if (buttonState1 == 1 && buttonState2 == 0 && buttonState3 == 0) {
        tone(buzzerPin, NOTE_C4);
      }
      else if (buttonState1 == 0 && buttonState2 == 1 && buttonState3 == 0){
        tone(buzzerPin, NOTE_D4);
      }
      else if (buttonState1 == 0 && buttonState2 == 0 && buttonState3 == 1){
        tone(buzzerPin, NOTE_E4);
      }   
      else if (buttonState1 == 1 && buttonState2 == 1 && buttonState3 == 0){
        tone(buzzerPin, NOTE_F4);
      } 
      else if (buttonState1 == 1 && buttonState2 == 0 && buttonState3 == 1){
        tone(buzzerPin, NOTE_G4);
      } 
      else if (buttonState1 == 0 && buttonState2 == 1 && buttonState3 == 1){
        tone(buzzerPin, NOTE_A4);
      } 
      else if (buttonState1 == 1 && buttonState2 == 1 && buttonState3 == 1){
        tone(buzzerPin, NOTE_B4);
      } 
     
    }


    else if (t2 < t1) {  
      noTone(buzzerPin);               // if right sensor triggered first'
      //Serial.println("Right to left");    // direction is right to left
      if (buttonState1 == 1 && buttonState2 == 0 && buttonState3 == 0) {
        tone(buzzerPin, NOTE_C4);
      }
      else if (buttonState1 == 0 && buttonState2 == 1 && buttonState3 == 0){
        tone(buzzerPin, NOTE_D4);
      }
      else if (buttonState1 == 0 && buttonState2 == 0 && buttonState3 == 1){
        tone(buzzerPin, NOTE_E4);
      }   
      else if (buttonState1 == 1 && buttonState2 == 1 && buttonState3 == 0){
        tone(buzzerPin, NOTE_F4);
      } 
      else if (buttonState1 == 1 && buttonState2 == 0 && buttonState3 == 1){
        tone(buzzerPin, NOTE_G4);
      } 
      else if (buttonState1 == 0 && buttonState2 == 1 && buttonState3 == 1){
        tone(buzzerPin, NOTE_A4);
      } 
      else if (buttonState1 == 1 && buttonState2 == 1 && buttonState3 == 1){
        tone(buzzerPin, NOTE_B4);
      } 
    }
    // else {
    //   Serial.println("No movement");         // else print nothing (shouldn't happen)
    // }

    // after printing direction, reset both timestamps to 0
    t1 = 0;
    t2 = 0;
  }

}