Sharabha - |||

//Connections 
//Connections between Sensors and Arduino is made as defied below
//You can also add an LED for making it more attarctive
#define FRONT_ULTROSONIC_SENSOR_TRIGGERPIN 2
#define FRONT_ULTASONIC_SENSOR_ECHOPIN 3 
#define LEFT_ULTROSONIC_SENSOR_TRIGGERPIN 4
#define LEFT_ULTASONIC_SENSOR_ECHOPIN 5 
#define RIGHT_ULTROSONIC_SENSOR_TRIGGERPIN 6
#define RIGHT_ULTASONIC_SENSOR_ECHOPIN 7 
#define BUZZER_PIN 8


//Declaring the Time Duration and Distance of your Hand
//The distances are declared as interger variables
int front_hand_distance;
int right_hand_distance;
int left_hand_distance;

//The duration are declared the form of long because it can aslo be a huge number
long front_duration;
long right_duration;
long left_duration;

//This function runs only once in the beginning when the arduino is powered.
void setup()
{ 
  //Setting all the INPUT pins
  pinMode(FRONT_ULTASONIC_SENSOR_ECHOPIN,INPUT);
  pinMode(LEFT_ULTASONIC_SENSOR_ECHOPIN,INPUT);
  pinMode(RIGHT_ULTASONIC_SENSOR_ECHOPIN,INPUT);
  
  //Setting all Output pins
  pinMode(FRONT_ULTROSONIC_SENSOR_TRIGGERPIN,OUTPUT);
  pinMode(LEFT_ULTROSONIC_SENSOR_TRIGGERPIN,OUTPUT);
  pinMode(RIGHT_ULTROSONIC_SENSOR_TRIGGERPIN,OUTPUT);
  pinMode(BUZZER_PIN,OUTPUT);
  
  //Setting Baud Rate as 9600
  /*
  The baud rate is the rate at which information is transferred in a communication channel. Baud rate is commonly used when discussing electronics that use serial communication. In the serial port context, "9600 baud" means that the serial port is capable of transferring a maximum of 9600 bits per second.
  
  */
  Serial.begin(9600);
  //Send the signal as a conformation that code has execueted
  digitalWrite(BUZZER_PIN,HIGH);  //Buzzer on
  delay(2000); //For 2 seconds
}

//This function runs continiously until the power is being supplied to arduino.
void loop()
{
  
  
  
  //Make Buzzer off
  digitalWrite(BUZZER_PIN,LOW);
  
  //Set Ultrasonic Sensor Trigger Pin Initially to Low
  digitalWrite(FRONT_ULTROSONIC_SENSOR_TRIGGERPIN,LOW);
  digitalWrite(LEFT_ULTROSONIC_SENSOR_TRIGGERPIN,LOW);
  digitalWrite(RIGHT_ULTROSONIC_SENSOR_TRIGGERPIN,LOW);
  delayMicroseconds(2);
  
  //Power on the Ultrasonic Sensor Trigger Pin
  digitalWrite(FRONT_ULTROSONIC_SENSOR_TRIGGERPIN,HIGH);
  digitalWrite(LEFT_ULTROSONIC_SENSOR_TRIGGERPIN,HIGH);
  digitalWrite(RIGHT_ULTROSONIC_SENSOR_TRIGGERPIN,HIGH);
  delayMicroseconds(10);
  
  //Set Ultrasonic Sensor Trigger Pin to Low Again
  digitalWrite(FRONT_ULTROSONIC_SENSOR_TRIGGERPIN, LOW);
  digitalWrite(LEFT_ULTROSONIC_SENSOR_TRIGGERPIN, LOW);
  digitalWrite(RIGHT_ULTROSONIC_SENSOR_TRIGGERPIN, LOW);
  delayMicroseconds(2);
  
  //Calculating the distance based on data received
  //hand_distance from front sensor
  front_duration=pulseIn(FRONT_ULTASONIC_SENSOR_ECHOPIN, HIGH);
  front_hand_distance= front_duration*0.034/2;
 
 //hand_distance from left sensor
  left_duration=pulseIn(LEFT_ULTASONIC_SENSOR_ECHOPIN, HIGH);
  left_hand_distance= left_duration*0.034/2;
  
  //hand_distance from right sensor
  right_duration=pulseIn(RIGHT_ULTASONIC_SENSOR_ECHOPIN, HIGH);
  right_hand_distance= right_duration*0.034/2;
  
  
  //Sending Signal if detected
  //Change the values according to your facial Dimensions
  
  
  if((front_hand_distance <= 21)||(right_hand_distance <= 19)||(left_hand_distance <= 19))
  {
      digitalWrite(BUZZER_PIN,HIGH);
      delayMicroseconds(10);
      digitalWrite(BUZZER_PIN,LOW);
      delayMicroseconds(10);
      digitalWrite(BUZZER_PIN,HIGH);
      delayMicroseconds(10);
      digitalWrite(BUZZER_PIN,LOW);
      delayMicroseconds(10);
  
  }
  
}