#define gas GPIO_NUM_27
#define buzzer1 GPIO_NUM_4
#define flss GPIO_NUM_13
#define fan GPIO_NUM_16
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,20,4);  // set the LCD address to 0x27 for a 16 chars and 2 line display

//#define led1 GPIO_NUM_5
unsigned int T[] = {100, 150, 250, 300, 350};
unsigned int U[] = {100, 200, 300, 400, 500};
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(buzzer1, OUTPUT);
  pinMode(fan, OUTPUT);
    lcd.init();
  lcd.clear();
  lcd.backlight();

}

void loop() {
  float analogValue_flss = analogRead(flss);
  Serial.print("flame sensor RAW:");
  Serial.println(analogValue_flss, 2); // so thuc dang sau de lam tron so
  float flame_sensor = map(analogValue_flss, 0, 4095, 100, 0);
  Serial.print(flame_sensor, 0);
  Serial.println("%");

  lcd.setCursor(0, 0);
  lcd.print(F("Flame: "));

  if (flame_sensor >= 90) {
    Serial.print("          co lua");
    lcd.print("CO LUA");
   delay(1000);
    for (int i = 0; i < 5; i++) {
      tone(buzzer1, T[i], U[i]);
     // delay(100);
     // noTone(buzzer1);
     // delay(100);
    }

  }
  else {
    lcd.print("ko lua");
    Serial.println("        khong lua");
   noTone(buzzer1);
    //delay(300);
  }
  // put your main code here, to run repeatedly:
   lcd.setCursor(0, 1);
   lcd.print(F("Gas:"));
  float analogValue_gas = analogRead(gas);
  Serial.print("sensor_gas RAW:");
  float mq2_sensor = map(analogValue_gas, 0, 4095, 0, 100);
  Serial.println(analogValue_gas, 2);

  if (mq2_sensor >= 10) {
    lcd.print("co GAS");
    Serial.print("        Co GAS");
    digitalWrite(fan, HIGH);
  }
  else {
    lcd.print("ko gas");
    Serial.println("          KO gas");
    digitalWrite(fan, LOW);

  }
}