pyaudio detects great cheers and sends a signal to Arduino

noise_detection.py

import audioop
import math
import numpy as np
import pyaudio
import pyfirmata
import sys
import time
import serial
import wave

CHUNK = 2048
RATE = 44100
p = pyaudio.PyAudio()
stream = p.open(format=pyaudio.paInt16,
                channels=1,
                rate=RATE,
                frames_per_buffer=CHUNK,
                input=True)

DURATION = 40 # 2 sec
THRESHOLD = 80 # 80 db
HALF_THRESHOLD = THRESHOLD / 2
input_levels = np.zeros(DURATION)
wf = wave.open('sound.wav', 'rb')

pin = 6
port = "/dev/{{YOUR_PORT}}"
board = pyfirmata.Arduino(port)

def detect_volume(input_levels, threshold):
    if input_levels.mean() > threshold:
        return True
    else:
        return False

while stream.is_active():
    input = stream.read(CHUNK, exception_on_overflow = False)
    rms = audioop.rms(input, 2) + 0.001
    decibel = 20 * math.log(rms, 10)
    input_levels = np.append(input_levels[1:], decibel)
    print(decibel)

    if detect_volume(input_levels, THRESHOLD):
        board.digital[pin].write(1)
        stream.stop_stream()

stream = p.open(format =
                p.get_format_from_width(wf.getsampwidth()),
                channels = wf.getnchannels(),
                rate = wf.getframerate(),
                output = True)

sound = wf.readframes(1024)

while(len(sound) > 0):
    stream.write(sound)
    sound = wf.readframes(1024)

stream.stop_stream()
stream.close()
p.terminate()