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

// DHT sensor configuration
#define DHTPIN 26    
#define DHTTYPE DHT22  
DHT dht(DHTPIN, DHTTYPE);

// Ultrasonic sensor configuration
#define TRIG_PIN 6  // Pin connected to TRIG of ultrasonic sensor
#define ECHO_PIN 18 // 

const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2705249;
const char* myApiKey = "Q3TFKUTFJ38UJ2FA";
const char* server = "api.thingspeak.com";

WiFiClient client;

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

  // Set ultrasonic sensor pins as output and input
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Connecting to Wi-Fi
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected!");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

// Function to measure distance using ultrasonic sensor
float getDistance() {
  // Clear the trigger pin
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);

  // Set trigger pin HIGH for 10 microseconds to send the ultrasonic pulse
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // Measure the time it takes for the echo to return
  long duration = pulseIn(ECHO_PIN, HIGH);

  // Calculate the distance (speed of sound is 34300 cm/s)
  float distance = duration * 0.034 / 2;

  return distance;
}

void loop() {
  // Read humidity and temperature from DHT22
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  // Read distance from ultrasonic sensor
  float distance = getDistance();

  // Set the fields for ThingSpeak
  ThingSpeak.setField(1, t);         // Temperature field
  ThingSpeak.setField(2, h);         // Humidity field
  ThingSpeak.setField(3, distance);  // Ultrasonic distance field

  // Write the data to ThingSpeak
  int x = ThingSpeak.writeFields(myChannelNumber, myApiKey);
  
  // Print the data to Serial Monitor
  Serial.print("Temperature: ");
  Serial.println(t);
  Serial.print("Humidity: ");
  Serial.println(h);
  Serial.print("Distance (cm): ");
  Serial.println(distance);
  
  delay(3000); // Wait for 3 seconds before sending next set of data
}