How do I make a dBA meter in Python?

[38034580]

Here's my GUI frontend:

from tkinter import *
from tk_tools import *
p = pyaudio.PyAudio()
root=Tk()
root.title('Decibel Meter')
gauge = Gauge(root, max_value=120.0, label='loudness', unit=' dBA', red=83, yellow=67)
gauge.pack()
led = Led(root, size=50)
led.pack()
led.to_red(on=False)
Label(root, text='Too Loud').pack()
root.mainloop()

The red LED will turn on when ambient sound exceeds 85dBA.