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

#include "DHT.h"
#define DHTPIN 26    
#define DHTTYPE DHT22 

const int trigPin = 5;
const int echoPin = 18; 

long duration;
int distance;

const char* WIFI_NAME = "Wokwi-GUEST";  //SSID_hotspot
const char* WIFI_PASSWORD = "";         //pswd_phone_wifi

const int myChannelId = 2696314;    //your channel id
const char* myWriteApiKey = "JB2E0LVK6OO4BBL9"; //write apikeyof your channel
const char* server = "api.thingspeak.com";

DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;

void distanceDHT() {
  // Clear the trigPin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  
  // Calculate the distance in centimeters
  distance = duration * 0.034 / 2;
  
  // Print the distance to the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  
  
  // Delay before the next loop
  delay(100);
  ThingSpeak.setField(3,distance);
}


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

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  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);
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  ThingSpeak.setField(1,t);
  ThingSpeak.setField(2,h);
  distanceDHT();
  ThingSpeak.writeFields(myChannelId,myWriteApiKey);
  Serial.print("Temperature: \t");
  Serial.println(t);
  Serial.print("Humidity: \t");
  Serial.println(h);
  delay(1000);  
}