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

// Pin definitions
const int MQ2_PIN = 4;     // Analog pin for MQ2
const int MQ7_PIN = 35;    // Analog pin for MQ7
const int ledPin = 5;      // LED indicator for safe status
const int ledPin1 = 2;     // LED indicator for dangerous status

// LCD configuration
#define LCD_ADDR 0x27       // I2C address for the LCD
#define LCD_COLUMNS 16
#define LCD_ROWS 2

LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLUMNS, LCD_ROWS);

// Calibration factors (adjust these based on calibration tests)
const float calibrationFactorMQ2 = 0.5; // Example calibration factor for MQ2
const float calibrationFactorMQ7 = 0.8; // Example calibration factor for MQ7

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

  // Pin modes
  pinMode(MQ2_PIN, INPUT);
  pinMode(MQ7_PIN, INPUT); // Set MQ7 pin mode
  pinMode(ledPin, OUTPUT);
  pinMode(ledPin1, OUTPUT);

  // Initialize LEDs to off
  digitalWrite(ledPin, LOW);
  digitalWrite(ledPin1, LOW);

  // Initialize LCD
  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("CO Level Monitor");
  delay(1000);
}

void loop() {
  // Read values from the sensors
  int sensorValueMQ2 = analogRead(MQ2_PIN);
  int sensorValueMQ7 = analogRead(MQ7_PIN); // Read MQ7 sensor value

  // Convert analog values to CO levels (in ppm) with calibration
  int coLevelMQ2 = map(sensorValueMQ2, 0, 1023, 0, 1000) * calibrationFactorMQ2; 
  int coLevelMQ7 = map(sensorValueMQ7, 0, 1023, 0, 1000) * calibrationFactorMQ7; 

  // Output to Serial Monitor
  Serial.print("CO Level MQ2: ");
  Serial.print(coLevelMQ2);
  Serial.println(" ppm");

  Serial.print("CO Level MQ7: ");
  Serial.print(coLevelMQ7);
  Serial.println(" ppm");

  // Update LCD display
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("CO MQ2: ");
  lcd.print(coLevelMQ2);
  lcd.print("  "); // Clear previous status
  lcd.setCursor(0, 1);
  lcd.print("CO MQ7: ");
  lcd.print(coLevelMQ7); // Display MQ7 value

  // Check CO levels and update status
  if (coLevelMQ2 < 200 && coLevelMQ7 < 100) {
    Serial.println("Tingkat CO aman");
    digitalWrite(ledPin, LOW); 
    digitalWrite(ledPin1, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("Status Aman   "); // Clear previous status
  } else {
    Serial.println("Tingkat CO berbahaya");
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin1, LOW); 
    lcd.setCursor(0, 1);
    lcd.print("Status Berbahaya");
  }

  delay(1000); // Delay for stability in readings
}