node-red-nodes/hardware/PiSrf/pisrf.html

<script type="text/x-red" data-template-name="rpi-srf">
    <div class="form-row">
        <label for="node-input-pins"><i class="fa fa-circle"></i> Pins</label>
        <input type="text" id="node-input-pins" placeholder="Trigger,Echo">
    </div>
    <div class="form-row">
        <label for="node-input-pulse"><i class="fa fa-clock-o"></i> Repeat (S)</label>
        <input type="text" id="node-input-pulse" placeholder="time between readings">
    </div>
    <div class="form-row">
        <label for="node-input-topic"><i class="fa fa-bars"></i> Topic</label>
        <input type="text" id="node-input-topic" placeholder="optional topic">
    </div>
    <div class="form-row">
        <label for="node-input-name"><i class="fa fa-tag"></i> Name</label>
        <input type="text" id="node-input-name" placeholder="Name">
    </div>
    <div class="form-tips"><b>Tip</b>: Pins MUST be a comma separated list of the 2 GPIO
    connector pin numbers that are connected to the Trigger and Echo pins of the SRF04 or SRF05.</div>
</script>

<script type="text/x-red" data-help-name="rpi-srf">
    <p>Raspberry Pi input from an SRF04 or SRF05 ultrasonic range finder.</p>
    <p>Outputs a <code>msg.payload</code> with a number representing the range in cm.</p>
    <p>Produces one measurement every 0.5s (default) - but only if the distance is different from the previous reading.</p>
    <p><b>Note:</b> we are using the actual physical pin numbers on connector P1 as they are easier to locate.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('rpi-srf',{
        category: 'Raspberry Pi',
        color:"#c6dbef",
        defaults: {
            name: { value:"" },
            topic: { value:"SRF" },
            pulse: {value:"0.5" },
            pins: { value:"", required:true, validate:RED.validators.regex(/^\d+,\d+$/) }
        },
        inputs:0,
        outputs:1,
        icon:"rpi.png",
        label:function() {
            return this.name||"Pi SRF";
        },
        labelStyle:function() {
            return this.name?"node_label_italic":"";
        }
    });
</script>