//https://wokwi.com/projects/439749547112587265
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int gas=A0;
int led1=13;
int buzzer=10;
void setup() {
lcd.init();
lcd.backlight();
pinMode(gas, INPUT);
pinMode(led1, OUTPUT);
pinMode(buzzer, OUTPUT);
}
void loop() {
 int cantidadGas=analogRead(gas);
 lcd.clear();
 lcd.setCursor(4,0);
 lcd.print(cantidadGas);
delay(400);
if(cantidadGas>900){
digitalWrite(led1, HIGH);
tone(buzzer,800);
}
else if(cantidadGas>600 && cantidadGas<900){
digitalWrite(led1, LOW);

tone(buzzer,600);
}
else{
digitalWrite(led1, LOW);
}
}