from machine import Pin, ADC
from time import sleep
import math

mic = ADC(Pin(2))
mic.atten(ADC.ATTN_11DB) 

calibration_constant = 2.0
noise_threshold = 60 

while True:
    mic_level = mic.read()
    mic_level_db = 20 * math.log10(mic_level / calibration_constant)
    if mic_level_db > noise_threshold:
        print("Warning: Noise pollution exceeds threshold!")
    print("dB: {:.2f}".format(mic_level_db))
    sleep(0.3)