#include <DHTesp.h>
#include <WiFi.h>
#include <ThingSpeak.h>
const int DHT_PIN = 15;     
const int TRIGGER_PIN = 27; 
const int ECHO_PIN = 14;  

DHTesp dhtSensor;             
const char* apiKey = "BPB4NMX3ZBN0TT31"; 
const unsigned long channelID = 2641506; 

WiFiClient client; 

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

  dhtSensor.setup(DHT_PIN, DHTesp::DHT22); 
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);     
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", ""); 
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 10) { 
    delay(50);
    attempts++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connected to WiFi");
  } else {
    Serial.println("Failed to connect to WiFi");
  }

  ThingSpeak.begin(client); 
}

void loop() {

  digitalWrite(TRIGGER_PIN, LOW); 
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);  
  digitalWrite(TRIGGER_PIN, LOW);

  long duration = pulseIn(ECHO_PIN, HIGH);  
  int distance = 0; 

  if (duration > 0) {
    distance = (duration * 0.034 / 2);
    Serial.print("Distance: ");
    Serial.print(distance);
    Serial.println(" mm");
  } else {
    Serial.println("Error: No pulse detected");
  }

  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  Serial.print("Temp: ");
  Serial.print(data.temperature, 2); 
  Serial.println(" °C");
  Serial.print("Humidity: ");
  Serial.print(data.humidity, 1);
  Serial.println(" %");

  ThingSpeak.setField(1, data.temperature); 
  ThingSpeak.setField(2, data.humidity);
  ThingSpeak.setField(3, distance);     

  int responseCode = ThingSpeak.writeFields(channelID, apiKey); 
  if (responseCode == 200) {
    Serial.println("Data sent to ThingSpeak successfully");
  } else {
    Serial.print("Error sending data to ThingSpeak: ");
    Serial.println(responseCode);
  }

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

  delay(20000); 
}