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MQTT-Group3

#导入库 pip install paho-mqtt import paho.mqtt.client as mqtt import json import time import threading from datetime import datetime

MQTT 配置

MQTT_BROKER = "your_mqtt_broker" MQTT_PORT = 1883 MQTT_TOPIC_CONTROL = "home/lights/control" MQTT_TOPIC_STATUS = "home/lights/status"

PyAudio配置

FORMAT = pyaudio.paInt16 # 16位深度 CHANNELS = 1 # 单通道 RATE = 44100 # 采样率 CHUNK = 1024 # 缓冲区大小

def get_current_db(stream): """读取音频流并计算当前的分贝值""" data = np.frombuffer(stream.read(CHUNK), dtype=np.int16) rms = np.sqrt(np.mean(np.square(data))) db = 20 * np.log10(rms) return db

def set_brightness(client, brightness): """通过MQTT发布设置亮度的消息""" client.publish(MQTT_TOPIC_SET_BRIGHTNESS, brightness) print(f"Set brightness to {brightness}")

def on_message(client, userdata, msg): """处理收到的MQTT消息,设置智能灯带亮度""" try: brightness = int(msg.payload.decode()) set_brightness(client, brightness) except ValueError: print("Invalid brightness value received")

def main(): # 初始化MQTT客户端 client = mqtt.Client()

# 设置回调函数
client.on_message = on_message

# 连接到MQTT代理
client.connect(MQTT_BROKER, MQTT_PORT, 60)

# 订阅主题
client.subscribe(MQTT_TOPIC_SET_BRIGHTNESS)

# 启动MQTT客户端
client.loop_start()

# 初始化PyAudio
audio = pyaudio.PyAudio()

# 打开流
stream = audio.open(format=FORMAT, channels=CHANNELS, rate=RATE, input=True, frames_per_buffer=CHUNK)

try:
    while True:
        # 计算当前分贝值
        db = get_current_db(stream)
        
        # 将分贝值转换为亮度值
        brightness = int(min(max((db + 50) * 2, 0), 100))
        
        # 发布亮度值
        client.publish(MQTT_TOPIC_DB_BRIGHTNESS, brightness)
        print(f"Current dB: {db:.2f}, Adjusted brightness: {brightness}")

except KeyboardInterrupt:
    # 关闭流和MQTT客户端
    stream.stop_stream()
    stream.close()
    audio.terminate()
    client.loop_stop()
    client.disconnect()
    print("Exiting...")

if name == "main": main()

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