Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Integrating Android Things With Alibaba Cloud IoT

DZone's Guide to

Integrating Android Things With Alibaba Cloud IoT

Let's build a functional formaldehyde and temperature sensor!

· IoT Zone ·
Free Resource

In this article, we will show you how you can connect Android Things to your Internet of Things (IoT) network easily with Alibaba Cloud IoT Platform. We will build a functional formaldehyde and temperature sensor for this project.

Hardware Devices

Project Device List

Project Device List android iot cloud

NXP i.MX7D Pins

NXP Pico i.MX7D full I/O interface document:

https://developer.android.com/things/hardware/imx7d#io-pinout

Device Wiring Diagram

Android Things Device Wiring Diagram

Alibaba Cloud IoT Configuration

After setting up the hardware, it's time to configure the software on Alibaba Cloud IoT Platform.

First, navigate to the IoT console and activate Alibaba Cloud IoT. Create an advanced product and add product attribute definition:

Image title

Alibaba Cloud IoT Configuration

Android Things Device Development

  1. Create an Android Things project using Android Studio, and grant network permissions
    <uses-permission android:name="android.permission.INTERNET" />

  2. Add the "eclipse.paho.mqtt" repository to gradle
    implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'

  3. Read DHT12 data through I2C
    private void readDataFromI2C() {
    
            try {
    
                byte[] data = new byte[5];
                i2cDevice.readRegBuffer(0x00, data, data.length);
    
                // check data
                if ((data[0] + data[1] + data[2] + data[3]) % 256 != data[4]) {
                    humidity = temperature = 0;
                    return;
                }
                // humidity data
                humidity = Double.valueOf(String.valueOf(data[0]) + "." + String.valueOf(data[1]));
                Log.d(TAG, "humidity: " + humidity);
                // temperature data
                if (data[3] < 128) {
                    temperature = Double.valueOf(String.valueOf(data[2]) + "." + String.valueOf(data[3]));
                } else {
                    temperature = Double.valueOf("-" + String.valueOf(data[2]) + "." + String.valueOf(data[3] - 128));
                }
    
                Log.d(TAG, "temperature: " + temperature);
    
            } catch (IOException e) {
                Log.e(TAG, "readDataFromI2C error " + e.getMessage(), e);
            }
    
        }

  4. Obtain Ze08CH2O data through UART
    try {
                    // data buffer
                    byte[] buffer = new byte[9];
    
                    while (uartDevice.read(buffer, buffer.length) > 0) {
    
                        if (checkSum(buffer)) {
                            ppbCh2o = buffer[4] * 256 + buffer[5];
                            ch2o = ppbCh2o / 66.64 * 0.08;
                        } else {
                            ch2o = ppbCh2o = 0;
                        }
                        Log.d(TAG, "ch2o: " + ch2o);
                    }
    
                } catch (IOException e) {
                    Log.e(TAG, "Ze08CH2O read data error " + e.getMessage(), e);
                }

  5. Create an Alibaba Cloud IoT connection and report the data
    /*
    payload format
    {
      "id": 123243,
      "params": {
        "temperature": 25.6,
        "humidity": 60.3,
        "ch2o": 0.048
      },
      "method": "thing.event.property.post"
    }
    */
    MqttMessage message = new MqttMessage(payload.getBytes("utf-8"));
    message.setQos(1);
    
    String pubTopic = "/sys/" + productKey + "/" + deviceName + "/thing/event/property/post";
    
    mqttClient.publish(pubTopic, message);


Real-Time Data on Cloud Console

After the device is started, you can view the real-time data of the device on the Alibaba Cloud IoT console, Device Management -> Running Status.

Image title

Source Code

To get the source code for this project, visit the following GitHub page.

Topics:
alibaba cloud ,android ,trends ,internet of things ,networking ,iot ,tutorial ,android things ,network

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}