<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept id="GUID-0F784804-8452-4C92-ABB3-56B81BAED744" xml:lang="en"><title>Sensor

Services Overview</title><shortdesc>The Sensor Services collection is a group of components that provide

APIs for extending sensors by means of plug-ins and providing channel-based

communication with the sensor hardware.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>

<section id="GUID-A6D94351-3A27-40CA-876A-B47B69AFD48C"><title>Key Concepts

and Terms</title><dl>

<dlentry>

<dt>Sensor</dt>

<dd><p>A sensor is a hardware measuring device connected to the Symbian

device, which measures a physical quantity in its immediate vicinity and converts

that quantity into small sets of numeric digital values.</p></dd>

</dlentry>

<dlentry>

<dt>Sensor Subsystem (SSY)</dt>

<dd><p>Sensor Subsystems are plug-ins that connect the sensor hardware with

the sensor server.</p></dd>

</dlentry>

</dl>           </section>

<section id="GUID-567734D1-EDE0-4799-8851-B798BB7ACF50"><title>Architecture</title> 

     <fig id="GUID-BD0DC0F8-9DA8-40D2-ABE5-F6D7D36BB4B6">

<title>Sensor Services Architecture</title>

<image href="GUID-5B8FEDA0-624E-44D6-BF70-C5228234BD15_d0e113139_href.png" placement="inline"/>

</fig><p>The Sensor Services collection consists of the following components:</p><ul>

<li><p><b>Sensor Framework</b>, which provides sensor server and plug-in interfaces

for adding any new sensor plug-in as required. The framework also provides

sensor channel APIs for creating a medium (sensor channel) of exchange between

the client applications and the sensor hardware. The sensor plug-ins retrieve

data from sensor hardware (through sensor channels) and enable the client

applications to use the data for specific requirements. </p></li>

<li><p><b>Data Compensator</b>, which uses data provided by the sensor plug-ins

to correct the sensor axis data based on the current orientation of the Symbian

device. This data can be used by the client applications to display the pages

in portrait or landscape views.</p></li>

</ul>     </section>

<section id="GUID-1ADD99BC-6ECF-464F-9E05-0BEA28F67A2B"><title>Typical Uses</title><ul>

<li><p><xref href="GUID-4B709839-8EEF-4AD2-9868-9AF0176B1E5B.dita">Using Sensor

Channel APIs</xref>.</p></li>

<li><p><xref href="GUID-64AC6F53-A9A5-46FD-BCC6-4A9BD8D4DB5C.dita">Compensating

Sensor Data for Display Orientation</xref></p></li>

</ul></section>

</conbody></concept>