#define BLYNK_TEMPLATE_ID "TMPL3YrIv5777"
#define BLYNK_TEMPLATE_NAME "read"
#define BLYNK_AUTH_TOKEN "Ojc-f_0qo8ZBiM2Fj6yiWhaU8QpZu_Ye"

#include <WiFi.h>
#include <BlynkSimpleEsp32.h>
#include <DHT.h>

#define PIN_TRIG 12
#define PIN_ECHO 13

char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define DHTPIN 15
#define DHTTYPE DHT22
#define GAS_PIN 34
#define LDR_PIN 35

DHT dht(DHTPIN, DHTTYPE);

#define VPIN_TEMP  V0
#define VPIN_HUM   V1
#define VPIN_ULTRA V2
#define VPIN_LDR   V3

void setup() {
  Serial.begin(115200);
  dht.begin();
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
}

void loop() {
  Blynk.run();
  sendSensorData();
  delay(2000);
}

void sendSensorData() {
  // DHT readings
  float temp = dht.readTemperature();
  float hum = dht.readHumidity();


  int ldrValue = analogRead(LDR_PIN);

  // Ultrasonic reading
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  long duration = pulseIn(PIN_ECHO, HIGH);
  int dist = duration / 58; // cm

  // Debug prints
  Serial.print("Distance: "); Serial.print(dist); Serial.println(" cm");
  Serial.print("Temp: "); Serial.print(temp); Serial.print(" °C  ");
  Serial.print("Hum: "); Serial.print(hum); Serial.println(" %");
  Serial.print("LDR: "); Serial.println(ldrValue);

  // Send to Blynk
  Blynk.virtualWrite(VPIN_TEMP, temp);
  Blynk.virtualWrite(VPIN_HUM, hum);
  Blynk.virtualWrite(VPIN_LDR, ldrValue);
  Blynk.virtualWrite(VPIN_ULTRA, dist);
}