#include "DHT.h"
#include <WiFi.h>
#include "ThingSpeak.h"
#define DHT11PIN 4
const char* ssid = "Wokwi-GUEST";
const char* password = "";
const int myChannelNumber = 2557762;
const char* myApiKey = "088FDVWCQY5PSQ4O";
const char* server = "api.thingspeak.com";
#define TRIG_PIN 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 5 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
float duration_us, distance_cm;

WiFiClient client;
DHT dht(DHT11PIN, DHT11);
void setup()
{
  Serial.begin(115200);
  // configure the trigger pin to output mode
  pinMode(TRIG_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN, INPUT);
  /* Start the DHT11 Sensor */
  dht.begin();
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("Hello, ESP32!");
  while(WiFi.status() != WL_CONNECTED){
    delay(500);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to the WiFi network");
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  ThingSpeak.begin(client);
}

void loop()
{
  float humi = dht.readHumidity();
  float temp = dht.readTemperature();
  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.print("ºC ");
  Serial.print("Humidity: ");
  Serial.println(humi);

  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
 
  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  
  // calculate the distance
  distance_cm = 0.017 * duration_us;
  // print the value to Serial Monitor
  Serial.print("distanceA: ");
  Serial.print(distance_cm);
  Serial.println(" cm      ");

  ThingSpeak.setField(1,temp);
  ThingSpeak.setField(2,humi);
  ThingSpeak.setField(3,distance_cm);

  int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);
  
  if(x == 200){
    Serial.println("Data pushed successfull");
  }else{
    Serial.println("Push error" + String(x));
  }

  delay(1000);
}