aliyun-iot-androidthings-nxp
谷歌 Android things 物联网硬件接入阿里云 IoT 物联网套件云端实战项目代码 https://github.com/iot-blog/aliyun-iot-android-things-nxp
1.硬件设备
android things 开发板 NXP Pico i.MX7D
NXP Pico i.MX7D 完整I/O接口文档
温湿度传感器 DHT12
DHT12 支持 I2C，淘宝有售
甲醛传感器 ZE08-CH2O
ZE08 支持 UART，淘宝有售
设备接线
aliyun_iot_androidthings_dht12_ze08
2.阿里云 IoT 物联网套件
2.1 开通阿里云 IoT 物联网套件
IoT物联网套件官网地址
2.2 创建高级版产品
产品属性定义
iot_product_property
2.3 设备端开发
a) 使用 Android Studio 创建 Android things 工程，添加网络权限
<uses-permission android:name="android.permission.INTERNET" />
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b) gradle 引入 eclipse.paho.mqtt
implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'
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c) DHT12Thermometer 通过 I2C 读取 DHT12 数据
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); }
}
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d) Ze08CH2O 通过 UART 获取 ZE08 数据
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); }
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e) 创建阿里云 IoT 连接，上报数据
/*payload格式{ "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);
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2.4 设备启动后，在阿里云 IoT 云端控制台查看实时数据
iot_device_status
物联网平台产品介绍详情：https://www.aliyun.com/product/iot/iot_instc_public_cn
阿里云物联网平台客户交流群
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