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


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


long myChannelNumber = 2660042;
const char * myWriteAPIKey = "UJLIOU9RCJM65UO6";


DHTesp dht;
TempAndHumidity data;


const int trigPin = 32; 
const int echoPin = 35; 

void setup() {
  Serial.begin(115200);

 
  dht.setup(18, DHTesp::DHT22);

  
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);

  connectToWiFi();
}

void connectToWiFi() {
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print("Attempting to connect");
    WiFi.begin(ssid, pass); 
    int attempt = 0;
    while (WiFi.status() != WL_CONNECTED && attempt < 20) {
      delay(500);
      Serial.print(".");
      attempt++;
    }
    if (WiFi.status() != WL_CONNECTED) {
      Serial.println("\nFailed to connect. Retrying...");
    } else {
      Serial.println("\nConnected.");
    }
  }
}

long measureDistance() {
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  
  
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  
  
  long duration = pulseIn(echoPin, HIGH);
  
 
  long distance = (duration / 2) / 29.1; 
  
  return distance;
}

void loop() {
  
  data = dht.getTempAndHumidity();
  Serial.print("Humidity: ");
  Serial.print(data.humidity);
  Serial.println(" %");
  Serial.print("Temperature: ");
  Serial.print(data.temperature);
  Serial.println(" °C");

  
  long distance = measureDistance();
  Serial.println("Distance: ");
  Serial.println(distance);
  Serial.println(" cm");

  
  ThingSpeak.setField(1, data.temperature);
  ThingSpeak.setField(2, data.humidity);
  ThingSpeak.setField(3, distance); 
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem Writing data. HTTP error code :" + String(statusCode));
  }

  
  delay(10000);
}