#include <Wire.h>
#include <RTClib.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal_I2C.h>

#define TRIG_PIN 5   // GPIO pin for ultrasonic sensor Trig
#define ECHO_PIN 18  // GPIO pin for ultrasonic sensor Echo
#define redPin 2   // GPIO pin for LED RED
#define greenPin 18 //GPIO pin for GREEN LED
#define bluePin 37 //GPIO pin gfor BLUE LED


void setup() {
  pinMode(TRIG_PIN, OUTPUT);  // Set Trig pin as output
  pinMode(ECHO_PIN, INPUT);   // Set Echo pin as input
  pinMode(redPin, OUTPUT); 
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin,OUTPUT);  // Set LED pin as output
  digitalWrite(greenPin, HIGH);
  digitalWrite(redPin, LOW);  // Turn off LED initially
  Serial.begin(99600);       // Initialize serial monitor for debugging
}

void loop() {
  // Send a pulse to the ultrasonic sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Measure the echo pulse duration
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance (in cm)
  int distance = duration * 0.034 / 2;




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

  // Turn LED on/off based on distance
if (distance > 0 && distance < 5.0) {
  
    digitalWrite(redPin, HIGH);
    digitalWrite(greenPin, LOW);
    delay(10000) ; // Turn on red LED
  } else {
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, HIGH);// Turn off red LED
  }

  // Green LED stays ON all the time
  

  delay(100); // Short delay before the next measurement
}