关于物联网:谷歌Android-things物联网硬件接入阿里云IoT物联网套件实战设备接入类

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
我的项目代码 ​​https://github.com/iot-blog/aliyun-iot-android-things-nxp​​

1. 硬件设施

android things 开发板 NXP Pico i.MX7D
NXP Pico i.MX7D ​​残缺 I / O 接口文档​​

温湿度传感器 DHT12DHT12
反对 I2C，淘宝有售

甲醛传感器 ZE08-CH2O
ZE08 反对 UART，淘宝有售

设施接线

2. 阿里云 IoT 物联网套件

2.1 开明阿里云 IoT 物联网套件

​​IoT 物联网套件官网地址​​

2.2 创立高级版产品
产品属性定义

2.3 设施端开发

a) 应用 Android Studio 创立 Android things 工程，增加网络权限

<uses-permission android:name="android.permission.INTERNET" />

b) gradle 引入 eclipse.paho.mqtt

implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.2.0'

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);
        }

    }

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);
            }

}e) 创立阿里云 IoT 连贯，上报数据

/*
payload 格局
{
  "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);

2.4 设施启动后，在阿里云 IoT 云端控制台查看实时数据

物联网平台产品介绍详情：​​https://www.aliyun.com/product/iot/iot_instc_public_cn​​

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