micropython ble 连接小米温湿度计2 获取数据

在MicroPython中，要通过BLE连接到小米温湿度计2并获取数据，你需要使用micropython的ble库。以下是一个简单的示例代码，它会扫描BLE设备，连接到小米温湿度计2，并获取温度和湿度数据。

from machine import Pin
from micropython import const
from ble_advertising import Advertising
 
# 定义小米温湿度计2的服务UUID
TEMPERATURE_SERVICE_UUID = const(0x181A)
HUMIDITY_SERVICE_UUID = const(0x181A)
 
# 定义温度和湿度的特征UUID
TEMPERATURE_CHARACTERISTIC_UUID = const(0x2A6E)
HUMIDITY_CHARACTERISTIC_UUID = const(0x2A6F)
 
# 初始化BLE适配器
ble = Advertising()
 
# 连接小米温湿度计2
def connect_to_xiaomi_hygrothermograph_2():
    # 扫描可用的BLE设备
    for adv in ble.scan():
        if 'xiaomi' in adv.name and 'Hygrothermograph 2' in adv.name:
            # 连接到小米温湿度计2
            central = ble.connect(adv)
            # 获取服务
            temp_service = central.service(TEMPERATURE_SERVICE_UUID)
            humidity_service = central.service(HUMIDITY_SERVICE_UUID)
            # 获取特征
            temperature_characteristic = temp_service.characteristic(TEMPERATURE_CHARACTERISTIC_UUID)
            humidity_characteristic = humidity_service.characteristic(HUMIDITY_CHARACTERISTIC_UUID)
            # 读取温度和湿度数据
            temperature = temperature_characteristic.read()
            humidity = humidity_characteristic.read()
            # 断开连接
            central.disconnect()
            # 返回温度和湿度数据
            return temperature, humidity
 
# 调用连接函数
temperature, humidity = connect_to_xiaomi_hygrothermograph_2()
# 显示温度和湿度数据
print(f"Temperature: {temperature[0]}°C, Humidity: {humidity[0]}%")

确保你的设备支持BLE，并且你的MicroPython固件已经包含了ble_advertising库。这个示例假设你的设备上有一个BLE适配器，并且它的名字包含"xiaomi"和"Hygrothermograph 2"。根据你的设备和固件版本，可能需要对代码进行适当的调整。