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.
NXP Pico i.MX7D full I/O interface document
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:
<uses-permission android:name="android.permission.INTERNET" />implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'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);
}
}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);
}/*
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);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.
To get the source code for this project, visit the following GitHub link: https://github.com/iot-blog/aliyun-iot-android-things-nxp
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