node-red/nodes/core/hardware/35-arduino.html

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        <label for="node-input-arduino"><i class="icon-tasks"></i> Arduino</label>
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    <div class="form-row">
        <label for="node-input-pin"><i class="icon-asterisk"></i> Pin</label>
        <input type="text" id="node-input-pin" placeholder="2">
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    <div class="form-row">
        <label for="node-input-state"><i class="icon-wrench"></i> Type</label>
        <select type="text" id="node-input-state" style="width: 150px;">
            <option value="INPUT">Digital pin</option>
            <option value="ANALOG">Analogue pin</option>
        </select>
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    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
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    <div class="form-tips"><b>Note:</b> You cannot use the same pin for both output and input.</div>
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<script type="text/x-red" data-help-name="arduino in">
    <p>Arduino input node. Connects to local Arduino and monitors the selected pin for changes. Uses <a href="http://firmata.org/" target="_new"><i>Firmata</i>.</a></p>
    <p>The Arduino must be loaded with the Standard Firmata sketch available in the Arduino examples.</p>
    <p>You can select either Digital or Analogue input. Outputs the value read as <b>msg.payload</b> and the pin number as <b>msg.topic</b>.</p>
    <p>It only outputs on a change of value - fine for digital inputs, but you can get a lot of data from analogue pins which you must then handle.</p>
    <p>You can set the sample rate in ms from 20 to 65535.</p>
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        <label for="node-input-state"><i class="icon-wrench"></i> Type</label>
        <select type="text" id="node-input-state" style="width: 200px;">
            <option value="OUTPUT">Digital (0/1)</option>
            <option value="PWM">Analogue (0-255)</option>
            <option value="SERVO">Servo (0-180)</option>
        </select>
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="icon-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-tips"><b>Note:</b> You cannot use the same pin for both output and input.</div>
</script>

<script type="text/x-red" data-help-name="arduino out">
    <p>Arduino output node. Connects to local Arduino and writes to the selected digital pin. Uses <a href="http://firmata.org/" target="_new"><i>Firmata</i>.</a></p>
    <p>The Arduino must be loaded with the Standard Firmata sketch available in the Arduino examples.</p>
    <p>You can select Digital, Analogue (PWM) or Servo type outputs. Expects a numeric value in <b>msg.payload</b>. The pin number is set in the properties panel.</p>
</script>

<script type="text/javascript">
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<script type="text/x-red" data-template-name="arduino-board">
    <div class="form-row">
        <label for="node-config-input-device"><i class="icon-random"></i> Port</label>
        <input type="text" id="node-config-input-device" style="width:60%;" placeholder="/dev/ttyUSB0"/>
        <a id="node-config-lookup-serial" class="btn"><i id="node-config-lookup-serial-icon" class="icon icon-search"></i></a>
    </div>
    <div class="form-tips"><b>Tip:</b> Leave blank for auto detect on first serial port.</div>
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