/*
* Elijah Yacoob L. Zipagan
* Motion Alarm System
*/

const int trigPin = 8;// Trig pin 8
const int echoPin = 9;// Echo  pin 9
long duration;// Long type variable for duration no value
int distance; // int Type variable for distance no value
int minDistance = 10;//Set minDistance value  to 10
int maxDistance = 15;//Set maxDistance value to 15

int buzzerPin = 11;//Declare an int type variable named buzz and add 11 as its pin value
int ledPin = 10;//Declare an int type variable named ledPin and add 10 as its pin value

String team = "Team Fantastic Four";
String project = "Motion Alarm System";

//minimum distance for the alarm
const int MIN_DISTANCE = 20; // Minimum distance in cm

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
  pinMode(echoPin, INPUT); // Sets the echoPin as an Input
  Serial.begin(9600); // Set default rate BAUD
  pinMode(buzzerPin, OUTPUT); //Set buzz pin as an output
  pinMode(ledPin, OUTPUT);// Set ledPin as an output
  Serial.println(team);
  Serial.println(project);
 
}

void loop() {
  digitalWrite(trigPin, LOW); // Trig Pin OFf
  delayMicroseconds(2);//Wait 2 Microseconds
  digitalWrite(trigPin, HIGH); // Trig Pin ON
  delayMicroseconds(10); // Wait 10 Micorseconds
  digitalWrite(trigPin, LOW); //Trig Pin OFF

  // Measure the duration of the pulse coming back
  long duration = pulseIn(echoPin, HIGH);

  // Convert duration to distance in cm
  int distance = duration * 0.034 / 2; // Formula for distance in cm

  // Print distance to the Serial Monitor (for debugging)
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  // Trigger alarm if the object is close
  if (distance > 0 && distance < MIN_DISTANCE) { // Use MIN_DISTANCE
    Serial.println("Unidentified threat!");
     //BEEP 1X TURN ON LED 
    tone(buzzerPin, 600, 500);//Beep Once for half second
    digitalWrite(ledPin, HIGH); //Turn  LED Red on
    digitalWrite(ledPin, LOW);// Turn LED Red off to blink
    delay(1000); //Wait in miliseconds 1000 = 1 Secod 
  }
  // Add a short delay to prevent excessive triggering
  delay(100);
}