from picozero import Speaker
from machine import ADC, Pin
from utime import sleep           
import math 

led = Pin(14, Pin.OUT)
buzzer = Speaker(15)
gas = ADC(26)

RL = 5000                         
R0 = 10000                        

m = -0.42                        
b = 1.92                       

while True:
    leitura = gas.read_u16()
    print("Nível de gás/fumaça:", leitura)
    sleep(1)

    leitura = gas.read_u16()                       
    tensao = (leitura / 65535) * 3.3                        
    rs = (3.3 - tensao) * RL / tensao                       
    razao = rs / R0                                        
    ppm = 10 ** ((math.log10(razao) - b) / m)               

    print("Leitura ADC:", leitura,                          
          "| Tensão: {:.2f} V".format(tensao),              
          "| Rs: {:.0f} Ω".format(rs),                      
          "| Fumaça estimada: {:.0f} ppm".format(ppm))      
    
    sleep(1)                                
 
    if leitura > 5000:
        buzzer.on()
        led.on()
    else:
        buzzer.off()
        led.off()