#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <DHT.h>

const char* ssid = "Wokwi-GUEST";  // SSID ของ Wi-Fi
const char* password = "";  // รหัสผ่านของ Wi-Fi
const char* scriptURL = "https://script.google.com/macros/s/AKfycbxhu2yN9WfhCRVRpfILCORqQUSEJqVd3wb3aoALktnqJvcQBYJJmpaifXOF2vIWpmUU/exec";  // URL ของ Google Apps Script

const int analogPin = 34;  // Pin สำหรับ MQ-135
const int dhtPin = 15;  // Pin สำหรับ DHT11

LiquidCrystal_I2C lcd(0x27, 20, 4);  // Address 0x27 สำหรับจอ LCD 20x4
DHT dht(dhtPin, DHT11);  // สร้าง object สำหรับ DHT11

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
  dht.begin();
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }

  Serial.println("Connected to WiFi");

  lcd.setCursor(0, 0);
  lcd.print("MQ-135 GAS SENSOR");
}

void loop() {
  // อ่านค่า DHT11
  float humidity = dht.readHumidity();
  float temperature = dht.readTemperature();

  // อ่านค่า MQ-135
  int sensorValue = analogRead(analogPin);
  float voltage = sensorValue * (3.3 / 4095.0);
  int alarm = (sensorValue > 2000) ? 1 : 0;  // เปลี่ยน '2000' เป็นค่า threshold ที่ต้องการ

  // แสดงผลบนจอ LCD
  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C");

  lcd.setCursor(0, 2);
  lcd.print("Humidity: ");
  lcd.print(humidity);
  lcd.print(" %");

  lcd.setCursor(0, 3);
  lcd.print("GAS ADC: ");
  lcd.print(sensorValue);
  lcd.print(" V:");
  lcd.print(voltage);

  // ส่งข้อมูลไปยัง Google Sheets
  if (WiFi.status() == WL_CONNECTED) {
    HTTPClient http;
    http.begin(scriptURL);
    http.addHeader("Content-Type", "application/json");

    String postData = "{\"value\":" + String(sensorValue) + ",\"voltage\":" + String(voltage) + ",\"alarm\":" + String(alarm) + ",\"temperature\":" + String(temperature) + ",\"humidity\":" + String(humidity) + "}";
    int httpResponseCode = http.POST(postData);

    if (httpResponseCode > 0) {
      String response = http.getString();
      Serial.println("Success");
      Serial.println(httpResponseCode);
      Serial.println(response);
      
      lcd.setCursor(0, 4);
      lcd.print("Status: Success ");
    } else {
      Serial.print("Error on sending POST: ");
      Serial.println(httpResponseCode);
      
      lcd.setCursor(0, 4);
      lcd.print("Status: Failed  ");
    }

    http.end();
  } else {
    Serial.println("WiFi Disconnected");
    lcd.setCursor(0, 4);
    lcd.print("Status: No WiFi ");
  }

  delay(20000);  // ส่งข้อมูลทุกๆ 20 วินาที
}