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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const unsigned long myChannelNumber = 2619873;
const char* myWriteAPIKey = "BEBINYHUYCQOA6HM";

const int trigPin = 27;
const int echoPin = 26;
const int DHTPIN = 16;
const int DHTTYPE = DHT22;

DHT dht(DHTPIN, DHTTYPE);

WiFiClient client;

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  dht.begin();

  WiFi.begin(ssid, password);
  Serial.print("You Are Connecting to Wi-Fi™⁜");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("You Have Connected to Wi-Fi");

  ThingSpeak.begin(client);
}

void loop() {
  long duration, distance;
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  
  distance = (duration * 0.0343) / 2;
  
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C");

  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  Serial.println("---------------------------");

  ThingSpeak.setField(1, temperature);
  ThingSpeak.setField(2, humidity);
  ThingSpeak.setField(3, distance);
  
  int httpCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(httpCode == 200) {
    Serial.println("Data sent successfully.");
  } else {
    Serial.print("Error sending data: ");
    Serial.println(httpCode);
  }
  
  delay(8000);
}