from machine import Pin, ADC
from picozero import Speaker
from time import sleep 

gas_sensor=ADC(Pin(26))
buzzer= Speaker (15)
while True:
    gas_value = gas_sensor.read_u16()
    voltage = (gas_value/6) * 3.3
    print("Gas sensor: ", gas_value,"Voltage: ", round(voltage,2),"V")

    if gas_value>40000:
       print("High Gas Concentration Detected")
       buzzer.on()
    else:
       print ("Gas Level Safe")
       buzzer.off()

    sleep(1)