我正在使用声音传感器模块LM393来检测Raspberry Pi 3 B +型设置中打的声音频率，该频率发生在300-500Hz左右。我的小型项目的范围是检测特定范围内的声音，然后将其发送到Firebase实时数据库，以后我可以从该数据库中将其用于Web应用程序前端。当前，LM393传感器检测到使用其内置功能已校准的任何声音，并将该消息发送到firebase。

#!/usr/bin/python
import RPi.GPIO as GPIO
from time import sleep
import datetime
from firebase import firebase
import urllib2,urllib,httplib
import json
import os 
from functools import partial

GPIO.setmode(GPIO.bcm)
GPIO.cleanup()
GPIO.setwarnings(False)

#GPIO SETUP
channel = 24
GPIO.setmode(GPIO.bcm)
GPIO.setup(channel,GPIO.IN)

firebase = firebase.FirebaseApplication('....',None)

def update_firebase():
    print('Sound Detected')
    data = {"Sound": "Sound Detected"}
    firebase.post('/sensor/sound',data)

def update_firebase2():
    print('Sound Detected')
    data2={"Sound": "Sound Not Detected"}
    firebase.post('/sensor/sound',data2)


def callback(channel):
    if GPIO.input(channel):
            update_firebase()
    else:
            update_firebase2()

GPIO.add_event_detect(channel,GPIO.BOTH,bouncetime=300)  # let us know when the pin goes HIGH or LOW
GPIO.add_event_callback(channel,callback)  # assign function to GPIO PIN,Run function on change

# infinite loop
while True:
        callback(channel)
        #sleepTime = int(sleepTime)
        sleep(10)