Sensors

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Defining sensors in SMIL playlist is designed to be robust, future proof and human readable. Below is used an example for already integrated Nexmosphere sensors.

Using Nexmosphere sensors

Nexmosphere supports a large amount of industry-grade sensors and provides a great response time.

 

Read More About Nexmosphere

Link to Nexmosphere Docs, website and other related resources. 

You can define multiple attached sensors connected to the supported device.

<head>
    <sensors>
        <sensor type="rfid" id="rfid1" driver="nexmosphere">
            <!-- Port on Nexmosphere controller where the antenna is attached to -->
            <option name="address">004</option>
        </sensor>
        <sensor type="rfid" id="rfid2" driver="nexmosphere">
            <!-- Port on Nexmosphere controller where the antenna is attached to -->
            <option name="address">005</option>
        </sensor>
    </sensors>
</head>

Once you define sensors, you can use them for triggering playlists:

<head>
    <triggers>
        <trigger id="trigger1" condition="or">
            <condition origin="rfid1" data="1" action="picked"/>
        </trigger>
        <trigger id="trigger2" condition="or">
            <condition origin="rfid1" data="2" action="picked"/>
        </trigger>
    </triggers>

</head>

The code above will

  1. trigger <par begin="trigger1"> or <seq begin="trigger1">
  2. whenever rfid antenna (<condition origin="rfid1" ...)
  3. emits that RFID tag with ID 1 (<condition ... data="1")
  4. was picked up (<condition ... action="picked").

RFID Antenna

Sensor definition:

<sensor type="rfid" id="rfid1" driver="nexmosphere">
    <!-- Port on Nexmosphere controller where the antenna is attached to -->
    <option name="address">004</option>
</sensor>

Sensor actions:

  • picked for action when you pick up the RFID tag from the antenna
  • placed for action when you put down the RFID tag on the antenna
<trigger id="trigger1" condition="or">
    <condition 
        origin="rfid1" <!-- Reference to the <sensor id="rfid1"> -->
        data="5" <!-- Reference to the RFID tag ID you are using -->
        action="picked" <!-- Reference to the user action with the RFID tag -->
    />
</trigger>

Buttons [IN PROGRESS]

This sensor is under integration, the API will probably change.

Sensor definition:

<sensor type="button" id="button1" driver="nexmosphere">
    <!-- Port on Nexmosphere controller where the button is attached to-->
    <option name="address">005</option>
</sensor>

Sensor actions:

  • pressed once you press the button and keep pressed
  • released once you release the button
<trigger id="trigger1" condition="or">
    <condition 
        origin="button1" <!-- Reference to the <sensor id="button1"> -->
        data="1" <!-- Reference to the button ID -->
        action="released" <!-- Reference to the user action  -->
    />
</trigger>

 

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