README.md

# 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()