#include <DHTesp.h>
#include <WiFi.h>
#include <LiquidCrystal_I2C.h>
#include <WiFiClient.h>
#include <ThingSpeak.h>

#define sensor 34
#define buzzer 2

DHTesp dhtSensor;
TempAndHumidity data;
const int dhtpin = 15;

//Initialize the LCD display
LiquidCrystal_I2C lcd(0x27, 16, 3);

//Enter your WIFI SSID and password
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

WiFiClient client;
unsigned long myChannelNumber = 2476226;
const char *myWriteAPIKey = "J3HVD05V4T2J6ERP";
int statusCode;

void setup() {
  // Debug console
  Serial.begin(115200);
  dhtSensor.setup(dhtpin, DHTesp::DHT22);
  lcd.init();
  lcd.backlight();
  pinMode(buzzer, OUTPUT);
  ThingSpeak.begin(client);
  WiFi.mode(WIFI_STA);

  lcd.setCursor(1, 0);
  lcd.print("Gas Detector");
  for (int a = 0; a <= 15; a++) {
    lcd.setCursor(a, 1);
    lcd.print(".");
    delay(200);
  }
  lcd.clear();
}

//Get the ultrasonic sensor values
void GASLevel() {
  int value = analogRead(sensor);
  value = map(value, 0, 4095, 0, 100);

  if (value >= 40) {
    digitalWrite(buzzer, HIGH);
    tone(buzzer, 200);

    lcd.setCursor(0, 1);
    lcd.print("Warning!  ");

  } else {
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
    lcd.setCursor(0,1);
    lcd.print("Normal   ");
  }
  Serial.println(value);
  lcd.setCursor(0, 0);
  lcd.print("GAS Level :");
  lcd.print(value);
  lcd.print(" ");
}

void dht(){
  lcd.setCursor(0,2);
  lcd.print("Humi:"+ String(data.temperature));
  lcd.setCursor(0,3);
  lcd.print("Temp:"+ String(data.humidity));
}
void loop() {
  GASLevel();
  dht();
  delay(2000);
   data = dhtSensor.getTempAndHumidity();
     Serial.println("Humi:" + String(data.temperature));
     Serial.println("Temp:" + String(data.humidity));
     Serial.println("<-------------------->");
    ThingSpeak.setField(1, data.temperature);
    ThingSpeak.setField(2, data.humidity);
    statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
}