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

# Initialize ADC and LED
pot = ADC(26)  # GP26
led = PWM(Pin(15, Pin.OUT))
led.freq(1000)

# Settings
threshold_db = 50
print_delta = 1.0  # Only print dB if it changes by this much

last_db = None

def read_db():
    raw = pot.read_u16()
    voltage_ratio = raw / 65535
    if voltage_ratio < 0.0001:
        voltage_ratio = 0.0001
    db = int((voltage_ratio) * 80)  

    return db

while True:
    current_db = read_db()

    # Print only if there's a noticeable change
    if (last_db is None) or (abs(current_db - last_db) >= print_delta):
        print("Sound Level: {:.2f} dB".format(current_db))
        if current_db > threshold_db:
            print("Sound is very high")
        last_db = current_db

    # Alarm: flash LED if sound is loud
    if current_db > threshold_db:
        Print = current_db * 800
        led.duty_u16(Print)
        time.sleep(0.15)
    else:
        led.duty_u16(0)
        time.sleep(0.15)