IoT Home Automation System

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <DHT.h>

char auth[] = "YourAuthToken";  // Replace with your Blynk Auth Token
char ssid[] = "YourSSID";       // Replace with your WiFi SSID
char pass[] = "YourPassword";   // Replace with your WiFi password

#define DHTPIN D3
#define DHTTYPE DHT11
#define RELAYPIN D1
#define PIRPIN D2
#define LDRPIN A0

DHT dht(DHTPIN, DHTTYPE);
BlynkTimer timer;

void setup() {
  // Debug console
  Serial.begin(115200);

  Blynk.begin(auth, ssid, pass);
  dht.begin();
  pinMode(RELAYPIN, OUTPUT);
  pinMode(PIRPIN, INPUT);
  digitalWrite(RELAYPIN, HIGH);  // Relay off initially

  // Setup a function to be called every second
  timer.setInterval(1000L, sendSensorData);
}

// Function to send sensor data to Blynk
void sendSensorData() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  int ldrValue = analogRead(LDRPIN);
  int pirState = digitalRead(PIRPIN);

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Blynk.virtualWrite(V2, pirState);
  Blynk.virtualWrite(V3, t);
  Blynk.virtualWrite(V4, h);
  Blynk.virtualWrite(V5, ldrValue);
}

// Function to control the relay
BLYNK_WRITE(V1) {
  int relayState = param.asInt();
  digitalWrite(RELAYPIN, relayState);
}

void loop() {
  Blynk.run();
  timer.run(); // Run the timer to ensure the data is sent to Blynk
}