#define ECHO_PIN 2
#define TRIG_PIN 15
#define ledred 5
#define ledorange 21
#define ledgreen 25
#define buzzerPin 19

void setup() {
  Serial.begin(115200);
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(ledred, OUTPUT);
  pinMode(ledorange, OUTPUT);
  pinMode(ledgreen, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}


void loop() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  
 Serial.print("krish: ");
 Serial.println(distance);

 delay(1000);

if (distance > 200){
  Serial.print("Safe....");
  digitalWrite(ledgreen, HIGH);
  delay(1300);
  digitalWrite(ledgreen, LOW);
  delay(1300);
  digitalWrite(ledgreen, HIGH);
  delay(1300);
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledorange, LOW);
  digitalWrite(ledred, LOW);
}
else if (distance < 200 && distance > 100){
  Serial.print("Un safe!");
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledred, LOW);
  digitalWrite(ledorange, HIGH);
  delay(600);
  digitalWrite(ledorange, LOW);
  delay(600);
  digitalWrite(ledorange, HIGH);
  delay(600);
  digitalWrite(ledorange, LOW);
}
else if (distance < 100){
  Serial.print("Danger, Alarm Ring!!!");
  digitalWrite(ledorange, LOW);
  digitalWrite(ledgreen, LOW);
  digitalWrite(ledred, HIGH);
  delay(300);
  digitalWrite(ledred, LOW);
  delay(300);
  digitalWrite(ledred, HIGH);
  delay(300);
  tone(buzzerPin, 1000); // Sound frequency 1000 Hz(adjust as needed)
    delay(3000); // Hold the Sound for 3 seconds
    noTone(buzzerPin); // Turn off the buzzer sound
}
else {}
}