sensors_sensor/README_zh.md

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# Sensor组件<a name="ZH-CN_TOPIC_0000001148682248"></a>
- [简介](#section11660541593)
- [目录](#section44981327519)
- [约束](#section98068674513)
- [使用](#section1581412211528)
- [接口说明](#section15684191115524)
- [使用说明](#section1543714111810)
- [相关仓](#section96071132185310)
## 简介<a name="section11660541593"></a>
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<a name="fig18632347122018"></a>
![](figures/zh-cn_image_0000001199027515.png)
## 目录<a name="section44981327519"></a>
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<a name="section98068674513"></a>
- 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
<a name="table1379101653916"></a>
<table><thead align="left"><tr id="row137911161397"><th class="cellrowborder" valign="top" width="23.46765323467653%" id="mcps1.2.5.1.1"><p id="p15138132134118"><a name="p15138132134118"></a><a name="p15138132134118"></a>传感器</p>
</th>
<th class="cellrowborder" valign="top" width="27.61723827617238%" id="mcps1.2.5.1.2"><p id="p2798169398"><a name="p2798169398"></a><a name="p2798169398"></a>权限名</p>
</th>
<th class="cellrowborder" valign="top" width="13.358664133586636%" id="mcps1.2.5.1.3"><p id="p14791716163914"><a name="p14791716163914"></a><a name="p14791716163914"></a>敏感级别</p>
</th>
<th class="cellrowborder" valign="top" width="35.55644435556444%" id="mcps1.2.5.1.4"><p id="p379171633919"><a name="p379171633919"></a><a name="p379171633919"></a>权限描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row12791216173912"><td class="cellrowborder" valign="top" width="23.46765323467653%" headers="mcps1.2.5.1.1 "><p id="p41385264116"><a name="p41385264116"></a><a name="p41385264116"></a>加速度传感器、加速度未校准传感器、线性加速度传感器</p>
</td>
<td class="cellrowborder" valign="top" width="27.61723827617238%" headers="mcps1.2.5.1.2 "><p id="p177941653914"><a name="p177941653914"></a><a name="p177941653914"></a>ohos.permission.ACCELEROMETER</p>
</td>
<td class="cellrowborder" valign="top" width="13.358664133586636%" headers="mcps1.2.5.1.3 "><p id="p207991683914"><a name="p207991683914"></a><a name="p207991683914"></a>system_grant</p>
</td>
<td class="cellrowborder" valign="top" width="35.55644435556444%" headers="mcps1.2.5.1.4 "><p id="p118061614399"><a name="p118061614399"></a><a name="p118061614399"></a>允许订阅加速度传感器的数据。</p>
</td>
</tr>
<tr id="row480116123911"><td class="cellrowborder" valign="top" width="23.46765323467653%" headers="mcps1.2.5.1.1 "><p id="p1213992174111"><a name="p1213992174111"></a><a name="p1213992174111"></a>陀螺仪传感器、陀螺仪未校准传感器</p>
</td>
<td class="cellrowborder" valign="top" width="27.61723827617238%" headers="mcps1.2.5.1.2 "><p id="p13807165395"><a name="p13807165395"></a><a name="p13807165395"></a>ohos.permission.GYROSCOPE</p>
</td>
<td class="cellrowborder" valign="top" width="13.358664133586636%" headers="mcps1.2.5.1.3 "><p id="p188031617391"><a name="p188031617391"></a><a name="p188031617391"></a>system_grant</p>
</td>
<td class="cellrowborder" valign="top" width="35.55644435556444%" headers="mcps1.2.5.1.4 "><p id="p4804168392"><a name="p4804168392"></a><a name="p4804168392"></a>允许订阅陀螺仪传感器的数据。</p>
</td>
</tr>
<tr id="row68051693916"><td class="cellrowborder" valign="top" width="23.46765323467653%" headers="mcps1.2.5.1.1 "><p id="p191397210413"><a name="p191397210413"></a><a name="p191397210413"></a>计步器</p>
</td>
<td class="cellrowborder" valign="top" width="27.61723827617238%" headers="mcps1.2.5.1.2 "><p id="p9802016183911"><a name="p9802016183911"></a><a name="p9802016183911"></a>ohos.permission.ACTIVITY_MOTION</p>
</td>
<td class="cellrowborder" valign="top" width="13.358664133586636%" headers="mcps1.2.5.1.3 "><p id="p11801216143916"><a name="p11801216143916"></a><a name="p11801216143916"></a>user_grant</p>
</td>
<td class="cellrowborder" valign="top" width="35.55644435556444%" headers="mcps1.2.5.1.4 "><p id="p48010163399"><a name="p48010163399"></a><a name="p48010163399"></a>允许订阅运动状态。</p>
</td>
</tr>
<tr id="row20323104234015"><td class="cellrowborder" valign="top" width="23.46765323467653%" headers="mcps1.2.5.1.1 "><p id="p3139172144118"><a name="p3139172144118"></a><a name="p3139172144118"></a>心率传感器</p>
</td>
<td class="cellrowborder" valign="top" width="27.61723827617238%" headers="mcps1.2.5.1.2 "><p id="p7323942174013"><a name="p7323942174013"></a><a name="p7323942174013"></a>ohos.permission.READ_HEALTH_DATA</p>
</td>
<td class="cellrowborder" valign="top" width="13.358664133586636%" headers="mcps1.2.5.1.3 "><p id="p1232314214407"><a name="p1232314214407"></a><a name="p1232314214407"></a>user_grant</p>
</td>
<td class="cellrowborder" valign="top" width="35.55644435556444%" headers="mcps1.2.5.1.4 "><p id="p12323144254018"><a name="p12323144254018"></a><a name="p12323144254018"></a>允许读取健康数据。</p>
</td>
</tr>
</tbody>
</table>
## 使用<a name="section1581412211528"></a>
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<a name="section15684191115524"></a>
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
<a name="table13821942165419"></a>
<table><thead align="left"><tr id="row6821194225417"><th class="cellrowborder" valign="top" width="40.11%" id="mcps1.2.3.1.1"><p id="p3822542145420"><a name="p3822542145420"></a><a name="p3822542145420"></a>接口名</p>
</th>
<th class="cellrowborder" valign="top" width="59.89%" id="mcps1.2.3.1.2"><p id="p0822942175411"><a name="p0822942175411"></a><a name="p0822942175411"></a>描述</p>
</th>
</tr>
</thead>
<tbody><tr id="row1782284211544"><td class="cellrowborder" valign="top" width="40.11%" headers="mcps1.2.3.1.1 "><p id="p18666622171316"><a name="p18666622171316"></a><a name="p18666622171316"></a>on(type: SensorType, callback: Callback&lt;Response&gt;, options?: Options)</p>
</td>
<td class="cellrowborder" valign="top" width="59.89%" headers="mcps1.2.3.1.2 "><p id="p1476355071517"><a name="p1476355071517"></a><a name="p1476355071517"></a>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。</p>
</td>
</tr>
<tr id="row1489993155613"><td class="cellrowborder" valign="top" width="40.11%" headers="mcps1.2.3.1.1 "><p id="p1490010315564"><a name="p1490010315564"></a><a name="p1490010315564"></a>once(type: SensorType, callback: Callback&lt;Response&gt;)</p>
</td>
<td class="cellrowborder" valign="top" width="59.89%" headers="mcps1.2.3.1.2 "><p id="p5900163115564"><a name="p5900163115564"></a><a name="p5900163115564"></a>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。</p>
</td>
</tr>
<tr id="row1909165317562"><td class="cellrowborder" valign="top" width="40.11%" headers="mcps1.2.3.1.1 "><p id="p16909135319564"><a name="p16909135319564"></a><a name="p16909135319564"></a>off(type: SensorType, callback: Callback&lt;Response&gt;)</p>
</td>
<td class="cellrowborder" valign="top" width="59.89%" headers="mcps1.2.3.1.2 "><p id="p3909165315613"><a name="p3909165315613"></a><a name="p3909165315613"></a>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。</p>
</td>
</tr>
</tbody>
</table>
### 使用说明<a name="section1543714111810"></a>
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<a name="section96071132185310"></a>
泛Sensor服务子系统
**sensors\_sensor**
[sensors\_miscdevice](https://gitee.com/openharmony/sensors_miscdevice)