Obstacle Avoidance using Infrared (IR) Sensor

int Buzzer = 3;
int AvoidancePin = 4; // define the obstacle avoidance sensor interface
int RedLed = 5 ;
int GreenLed = 6 ;
int val ;// Value High or LOW. 

// here i set up the tones, you can change them @ void loop.
int tones[] = {261, 277, 293, 311, 329, 349, 369, 392, 415, 440, 466, 493, 523 ,554};
//              1    2    3    4    5    6    7    8    9    10   11   12   13   14
// You can add more tones but i added 14. Just fill in what tone you would like to use, @ void loop you see " tone(Buzzer, tones[12]); " below,  digitalWrite(Buzzer, HIGH);
// here you can change the tones by filling in a number between 1 and 14

void setup ()
{
  Serial.begin (9600);
  pinMode (RedLed, OUTPUT) ;
  pinMode (GreenLed, OUTPUT) ; 
  pinMode (Buzzer, OUTPUT) ;
  pinMode (AvoidancePin, INPUT) ;// define the obstacle avoidance sensor output interface
}
void loop ()
{
  val = digitalRead (AvoidancePin) ;// Reading from the AvoidancePin
  if (val == HIGH) 
  {
    digitalWrite (RedLed, LOW);
    digitalWrite (GreenLed, HIGH);
    digitalWrite (Buzzer, LOW);
    noTone(Buzzer);
    delay(100);
  }
  else
  {
    digitalWrite (RedLed, HIGH);
    digitalWrite (GreenLed, LOW);
    digitalWrite (Buzzer, HIGH);
    tone(Buzzer, tones[6]);//You can change the tone choosing from 1 to 14.
    delay(100);
    
  }
}