micropython esp32空气监测代码

MicroPython ESP32是一个针对ESP32微控制器的轻量级Python实现，它可以在物联网设备上运行，并支持像空气监测这样的应用。下面是一个简单的示例代码，用于使用MQTT协议连接到一个空气质量传感器，并通过WiFi将数据发送到云端：

import machine
import urequests
from umqtt.simple import MQTTClient

# 定义传感器的数据获取函数
def get_air_quality():
    # 模拟从传感器读取数据
    air_quality = 75  # 假设数值范围0-255
    return air_quality

# 空气质量传感器的IP地址和端口
broker_ip = "your_mqtt_broker_address"
broker_port = 1883

# 订阅的主题和发布主题
topic_sub = "#"
topic_pub = "sensor/airquality"

# 创建MQTT客户端实例
client_id = "esp32-airmonitor"
client = MQTTClient(client_id, broker_ip, port=broker_port)

def on_connect(client, userdata, flags, rc):
    print("Connected to MQTT broker with result code", rc)
    client.subscribe(topic_sub)

def on_message(client, topic, msg):
    print(f"Received message on {topic}: {msg.decode()}")

client.on_connect = on_connect
client.on_message = on_message

# 连接到MQTT服务器并开始监听消息
machine.WDT(timeout=5000)  # 防止WDT timeout
client.connect()
client.loop_start()

while True:
    try:
        air_quality = get_air_quality()
        payload = str(air_quality)
        
        # 发布当前的空气质量数据
        client.publish(topic_pub, payload)
        
        print(f"Published air quality: {payload}")
        sleep(60)  # 每分钟发送一次数据
    except Exception as e:
        print("Error:", e)

在这个代码中，你需要替换`your_mqtt_broker_address`为你实际的MQTT服务器地址，然后根据实际的传感器接口修改`get_air_quality()`函数。