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README
Apache-2.0

Sensor组件

简介

传感器是指用于侦测环境中所发生事件或变化,并将此消息发送至其他电子设备(如中央处理器)的设备,通常由敏感组件和转换组件组成。传感器是实现物联网智能化的重要基石,为实现全场景智慧化战略,支撑“1+8+N”产品需求,需要构筑统一的传感器管理框架,达到为各产品/业务提供低时延、低功耗的感知数据的目的。根据用途可分为以下六大类:

  • 运动类:加速度、陀螺仪、重力、线性加速度传感器等
  • 姿态类:旋转矢量、方向传感器等
  • 环境类:磁力计、气压、湿度传感器等
  • 光线类:环境光、接近光、色温传感器等
  • 健康类:心率、心跳传感器等
  • 其它:霍尔传感器、手握传感器等

传感器架构图如下所示:

图 1 Sensor架构图

目录

sensor导入模块的示例代码如下:

/base/sensors/sensor
├── frameworks                 # 框架代码
│   └── native                 # sensor客户端代码          
├── interfaces                 # 对外接口存放目录
│   ├── native                 # sensor native实现
│   └── plugin                 # Js API
├── sa_profile                 # 服务名称和服务的动态库的配置文件
├── services                   # 服务的代码目录
│   └── sensor                 # 传感器服务,包括加速度、陀螺仪等,上报传感器数据
└── utils                      # 公共代码,包括权限、通信等能力

约束

  • 要使用传感器的功能,设备必须具有对应的传感器器件。

  • 针对某些传感器,开发者需要请求相应的权限,才能获取到相应传感器的数据。

    表 1 传感器权限列表

    传感器

    权限名

    敏感级别

    权限描述

    加速度传感器、加速度未校准传感器、线性加速度传感器

    ohos.permission.ACCELEROMETER

    system_grant

    允许订阅加速度传感器的数据。

    陀螺仪传感器、陀螺仪未校准传感器

    ohos.permission.GYROSCOPE

    system_grant

    允许订阅陀螺仪传感器的数据。

    计步器

    ohos.permission.ACTIVITY_MOTION

    user_grant

    允许订阅运动状态。

    心率传感器

    ohos.permission.READ_HEALTH_DATA

    user_grant

    允许读取健康数据。

使用

本节以传感器 JS API为例,说明其提供的具体功能以及使用流程。

接口说明

传感器 JS API:监听传感器数据变化,如果多次调用该接口,则最后一次调用生效。JS API开放的能力如下:

表 2 JS API的主要接口

接口名

描述

on(type: SensorType, callback: Callback<Response>, options?: Options)

监听传感器数据变化。SensorType为支持订阅的传感器类型,callback表示订阅传感器的回调函数,options为设置传感器数据上报的时间间隔。

once(type: SensorType, callback: Callback<Response>)

监听传感器数据变化一次。SensorType为支持订阅的传感器类型,callback表示订阅传感器的回调函数。

off(type: SensorType, callback: Callback<Response>)

取消订阅传感器数据。SensorType为支持的取消订阅的传感器类型,callback表示取消订阅传感器是否成功。

使用说明

  1. 导包。
  2. 注册并监听加速度传感器数据的变化。
  3. 取消订阅加速度传感器数据的变化。
  4. 注册并监听加速度传感器数据的变化一次。

示例代码:

//步骤1 导包
import sensor from '@ohos.sensor';
export default {
    onCreate() {
        //步骤2 监听传感器数据变化,并注册传感器类型
        sensor.on(sensor.SensorType.SENSOR_TYPE_ID_ACCELEROMETER, (data) => {
            console.info("Acceleration data obtained. x: " + data.x + "; y: " + data.y + "; z: " + data.z);
        }, {'interval':200000000});
        //步骤3 设置10秒后取消订阅传感器数据
        sensor.off(sensor.SensorType.SENSOR_TYPE_ID_LINEAR_ACCELERATION);
        //步骤4 监听传感器数据变化一次,并注册传感器类型
        sensor.once(sensor.SensorType.SENSOR_TYPE_ID_ACCELEROMETER, (data) => {
            console.info("Acceleration data obtained. x: " + data.x + "; y: " + data.y + "; z: " + data.z);
       });
    }
    onDestroy() {
        console.info('AceApplication onDestroy');
    }
}

相关仓

泛Sensor服务子系统

sensors_sensor

sensors_miscdevice

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Obtaining sensor data | 获取传感器数据 展开 收起
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