#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 = "BRAT1EJE384LK46V";
const unsigned long channelID = 2641373; 

WiFiClient client; 

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

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

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

  // Connect to WiFi
  Serial.print("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", ""); 
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) { // 20 attempts max
    delay(500);
    Serial.print(".");
    attempts++;
  }
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("Connected to WiFi");
    Serial.print("IP Address: ");
    Serial.println(WiFi.localIP());
  } else {
    Serial.println("Failed to connect to WiFi");
  }

  ThingSpeak.begin(client); // Pass the WiFiClient instance
}

void loop() {
  // Measure distance
  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");
  }

  // Read temperature and humidity
  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(" %");

  // Send data to ThingSpeak
  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(10000); // Wait 20 seconds before the next loop
}