#include <DHT.h>

#define DHTPIN 32
#define DHTTYPE DHT22
#define trigPin 13
#define echoPin 12
#define greenLedPin 14
#define redLedPin 15
#define ldrPin 34

DHT dht(DHTPIN, DHTTYPE);
float temperature = 0;
float humidity = 0;
unsigned long lastTempHumReadTime = 0;
int ledBrightness = 0;
int ldrValue = 0;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(greenLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(ldrPin, INPUT);
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  if (millis() - lastTempHumReadTime > 2000) {
    readTemperatureAndHumidity();
    lastTempHumReadTime = millis();
  }

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  int distance = duration / 58;
  
  ldrValue = analogRead(ldrPin);
  ledBrightness = map(ldrValue, 0, 4095, 0, 255);
  
  analogWrite(greenLedPin, ledBrightness);
  
  if (distance <= 50) {
    digitalWrite(redLedPin, HIGH);
  } else {
    digitalWrite(redLedPin, LOW);
  }

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.print(" cm, Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  delay(1000);
}

void readTemperatureAndHumidity() {
  humidity = dht.readHumidity();
  temperature = dht.readTemperature();
  
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
  }
}