30分钟内将树莓派连接到微软云Azure IoT Hub并将

树莓派是很多动手达人必备的小玩具，本节内容，让我们拿出树莓派，在30分钟内，将树莓派连接到微软云Azure的IoT Hub，然后将温湿度曲线可视化。

更多内容请关注公众号"云计算实战"

本文完整的操作视频参见：https://v.qq.com/x/page/f3025q4e75x.html

本节内容中，树莓派发送的数据是模拟出来的，并没有真实的连接到传感器，您可以选购不同的传感器来采集真实的环境信息。

Azure IoT Hub 为我们提供了设备与云双向通讯的能力，通过多种语言的SDK，我们能轻松快速的将树莓派接入到云。本案例使用微软官方代码，示例代码一共约70行，非常简单。

关于IoT Hub的更多内容，请参考：

Azure 上的物联网服务介绍

时序见解（Azure Time Series Insights）用来存储时间序列的值，同时提供UI，将数据可视化。

关于时序见解的更多内容，请参考：

Azure Time Series Insights-时序见解（1）

时序见解和IoT Hub可以无缝连接，无需写代码即可将上传到IoT Hub的数据进行可视化。

树莓派上传数据的代码：

import randomimport timeimport sys# Using the Python Device SDK for IoT Hub:#   https://github.com/Azure/azure-iot-sdk-python# The sample connects to a device-specific MQTT endpoint on your IoT Hub.import iothub_client# pylint: disable=E0611from iothub_client import IoTHubClient, IoTHubClientError, IoTHubTransportProvider, IoTHubClientResultfrom iothub_client import IoTHubMessage, IoTHubMessageDispositionResult, IoTHubError, DeviceMethodReturnValue# The device connection string to authenticate the device with your IoT hub.# Using the Azure CLI:# az iot hub device-identity show-connection-string --hub-name {YourIoTHubName} --device-id MyNodeDevice --output tableCONNECTION_STRING = "HostName=iothubforsatest.azure-devices.cn;DeviceId=test001;SharedAccessKey=kev0eMtTv2UfUU+JD6WAQN2sSdNI9QnRbs4nv2n+1vg="# Using the MQTT protocol.PROTOCOL = IoTHubTransportProvider.MQTTMESSAGE_TIMEOUT = 10000# Define the JSON message to send to IoT Hub.TEMPERATURE = 100.0HUMIDITY = 60MSG_TXT = "{\"temperature\": %.2f,\"humidity\": %.2f,\"deviceid\": 'test0001'}"def send_confirmation_callback(message, result, user_context):    print ( "IoT Hub responded to message with status: %s" % (result) )def iothub_client_init():    # Create an IoT Hub client    client = IoTHubClient(CONNECTION_STRING, PROTOCOL)    return clientdef iothub_client_telemetry_sample_run():    try:        client = iothub_client_init()        print ( "IoT Hub device sending periodic messages, press Ctrl-C to exit" )        while True:            # Build the message with simulated telemetry values.            temperature = TEMPERATURE + (random.random() * 15)            humidity = HUMIDITY + (random.random() * 20)            msg_txt_formatted = MSG_TXT % (temperature, humidity)            message = IoTHubMessage(msg_txt_formatted)            # Add a custom application property to the message.            # An IoT hub can filter on these properties without access to the message body.            prop_map = message.properties()            if temperature > 30:              prop_map.add("temperatureAlert", "true")            else:              prop_map.add("temperatureAlert", "false")            # Send the message.            print( "Sending message: %s" % message.get_string() )            client.send_event_async(message, send_confirmation_callback, None)            time.sleep(3)    except IoTHubError as iothub_error:        print ( "Unexpected error %s from IoTHub" % iothub_error )        return    except KeyboardInterrupt:        print ( "IoTHubClient sample stopped" )if __name__ == '__main__':    print ( "IoT Hub Quickstart #1 - Simulated device" )    print ( "Press Ctrl-C to exit" )    iothub_client_telemetry_sample_run()

IoT Hub 接入文档，请参考：

https://docs.azure.cn/zh-cn/iot-hub/quickstart-send-telemetry-python

树莓派系统下载：

https://www.raspberrypi.org/downloads/

Micro SD卡格式化工具：

https://www.sdcard.org/downloads/index.html

树莓派系统写入Micro SD卡工具：

https://sourceforge.net/projects/win32diskimager/