#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#include <LiquidCrystal_I2C.h>
#include <MQ135.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4

const int mq135_simulator = 32; 
const int DHT_PIN = 12;
const int BUZ_PIN = 13;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber =2431632 ;
const char* myApiKey = "PS8Y0KR4R0FSN5K1";
const char* server = "api.thingspeak.com";

DHTesp dhtSensor;
 LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
WiFiClient client;

float Read_ppm_data()
{
  // Read the analog value from the potentiometer (10-bit range)
  int value = analogRead(mq135_simulator);

  // Map the 10-bit range to 0-1023
  int to_1023_value = map(value, 0, 1023, 0, 1023);

  // Adjust the formula based on the characteristics of your MQ135 sensor
  // This is just a placeholder and may need to be modified
  float to_ppm = to_1023_value * 1200.0 / 1023.0;

  return to_ppm;
}


void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(BUZ_PIN, OUTPUT);
  pinMode(mq135_simulator, 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);
  lcd.init();
  lcd.backlight();
}

void loop() {
    // TempAndHumidity data = dhtSensor.getTempAndHumidity();
  float ppm = Read_ppm_data();
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  ThingSpeak.setField(1,data.temperature);
  ThingSpeak.setField(2,data.humidity);
  ThingSpeak.setField(3,ppm);
  if (data.temperature > 35 || data.temperature < 12 || data.humidity > 70 && data.humidity < 40) {
       for (int i = 0; i < 6; i++) {
      tone(BUZ_PIN, 440, 500);  // A4
      delay(400);
      tone(BUZ_PIN, 523, 500);  // C5
      delay(400);
      tone(BUZ_PIN, 587, 500);  // D5
      delay(400);
      tone(BUZ_PIN, 659, 500);  // E5
      delay(400);
    }
    delay(500);   // Pause between repetitions
  }else{
    noTone(BUZ_PIN);
  }
  
  int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);
  
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  Serial.println("AQI: " + String(ppm, 3) + "ppm");
  
  if(x == 200){
    Serial.println("Data pushed successfull");
  }else{
    Serial.println("Push error" + String(x));
  }
  Serial.println("---");
  lcd.setCursor(0, 0);
  lcd.print("  Temp: " + String(data.temperature, 2) + "\xDF"+"C  ");
  lcd.setCursor(0, 1);
  lcd.print(" Humidity: " + String(data.humidity, 1) + "% ");
  lcd.setCursor(0, 2);
  lcd.print(" AQI: " + String(ppm, 3) + "ppm ");

  lcd.print("Wokwi Online IoT");

  delay(1000);

  delay(10000);
}