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

#define DHTPIN 14
#define DHTTYPE DHT22
#define TRIG_PIN 5
#define ECHO_PIN 23
#define LED_PIN 15
const char* ssid = "Wokwi-GUEST";
const char* pass = "";
DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;

unsigned long myChannelNumber = 2703118; // Replace with your channel number
const char * myWriteAPIKey = "0B7EVPF931H0D8Z0"; // Replace with your write API key

void setup() {
    Serial.begin(9600);
    dht.begin();
    pinMode(LED_PIN, OUTPUT);
    
    // Initialize WiFi
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("WiFi connected");
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT); 
    ThingSpeak.begin(client);
}

void loop() {
    // Read temperature
    float temperature = dht.readTemperature();
    float humidity = dht.readHumidity();
    // Read distance
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);
    
    long duration = pulseIn(ECHO_PIN, HIGH);
    long distance = (duration * 0.034) / 2;

    Serial.print("Distance: ");
    Serial.print(distance);
    Serial.println("cm");
    Serial.print("Temperature:");
    Serial.print(temperature);
    Serial.println("°C");
    Serial.print("Humidity: ");
    Serial.println(humidity);
    Serial.print("%");
    // Update LED state based on conditions
      String ledStatus = "OFF";
    if (distance > 200 & temperature > 38) {
        digitalWrite(LED_PIN, HIGH); // Turn LED ON
         ledStatus = "ON";
    } else {
        digitalWrite(LED_PIN, LOW);  // Turn LED OFF
         ledStatus = "OFF";
    }
    Serial.print("Led is:");
    Serial.println(ledStatus);


    // Send data to ThingSpeak
    ThingSpeak.setField(1, humidity);
    ThingSpeak.setField(2, temperature);
    ThingSpeak.setField(3, distance);
    ThingSpeak.setField(3,ledStatus);
    int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    
    if (x == 200) {
        Serial.println("Data sent successfully.");
    } else {
        Serial.println("Failed to send data.");
    }

    delay(15000);
}