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

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

DHTesp dhtsensor;
TempAndHumidity data;

const int DHT_PIN = 25;
const int TRIG_PIN = 21;
const int ECHO_PIN = 5;

WiFiClient client;
long myChannelNumber =   2643839;
const char *myWriteAPIKey = "E0WB399YMCZHBBTY";

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

 
  dhtsensor.setup(DHT_PIN, DHTesp::DHT22);

  pinMode(TRIG_PIN, OUTPUT); 
  pinMode(ECHO_PIN, INPUT); 

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

  Serial.println("Setup complete.");
}

void loop() {  
  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("Attempting to connect to WiFi...");
    WiFi.begin(ssid, pass);
    while (WiFi.status() != WL_CONNECTED) {
      delay(5000);
      Serial.print(".");
    }
    Serial.println("\nConnected to WiFi.");
  }
  data = dhtsensor.getTempAndHumidity();
  float humidity = data.humidity;
  float temperature = data.temperature;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  long duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.0344 / 2.0; 
  Serial.print("Humidity: ");
  Serial.println(humidity);
  Serial.print("Temperature: ");
  Serial.println(temperature);
  Serial.print("Distance: ");
  Serial.println(distance);
  Serial.println("--------------");
  ThingSpeak.setField(1, humidity);
  ThingSpeak.setField(2, temperature);
  ThingSpeak.setField(3, distance);
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.print("Problem writing data. HTTP error code: ");
    Serial.println(statusCode);
  }

  delay(2000);  
}