node-red-contrib-htu21d/htu21d.html

Connect a Measurement Specialties HTU21D humidity sensor to Node-RED

<!--
  Copyright 2015 Maxwell Hadley

  See accompanying LICENSE file for terms of use
-->

<!-- Edit dialog  -->

<script type="text/x-red" data-template-name="htu21d">
	<div class="form-row">
        <label for="node-input-device"><i class="fa fa-cog"></i> Device</label>
        <input type="text" id="node-input-device" placeholder="Device">
    </div>
	<div class="form-row">
        <label for="node-input-updateInterval"><i class="fa fa-repeat"></i> Update at</label>
        <input type="text" id="node-input-updateInterval" style="width:15%">
        <label style="width:50%">second intervals</label>
    </div>
    <div class="form-row">
        <label><i class="fa fa-tachometer"></i> Units</label>
        <label for="node-input-dewpointUnits" style="width:16%">Dewpoint:</label>
        <select id="node-input-dewpointUnits" style="width:12%">
            <option value="degC">˚C</option>
            <option value="degF">˚F</option>
        </select>
        <label for="node-input-temperatureUnits"> Temperature:</label>
        <select id="node-input-temperatureUnits" style="width:12%">
            <option value="degC">˚C</option>
            <option value="degF">˚F</option>
        </select>
    </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>
</script>

<!-- Help text -->
<script type="text/x-red" data-help-name="htu21d">
   <p>Reads data from a Measurement Specialities HTU21D Humidity sensor using the I2C interface</p>
   Periodically reads the sensor and sends a message containing temperature, relative humidity and dewpoint
   (<b>payload.temperature</b>, <b>payload.humidity</b> and <b>payload.dewpoint</b>).
   Relative humidity is always given in percent; the temperature and dewpoint units
   of measurement can be selected as required.</p>
   <p>The dewpoint is calculated from the measured temperature and relative humidity.</p>
   <p>Measurements regularly update at the specified interval.</p>
</script>

<!-- Register node type  -->
<script type="text/javascript">
    RED.nodes.registerType('htu21d', {
        category: 'hardware',     
        defaults: {        
  			device: {value: '\/dev\/i2c-1', required:false},
			updateInterval: {value: '15', required:true},
            dewpointUnits: {value: 'degC', required:true},
            temperatureUnits: {value: 'degC', required:true},
			name: {value: ''}
        },
		color:'#d8bfd8',
        inputs:0,              
        outputs:1,          
        icon: 'chip.png',
        label: function () {
            return this.name || 'HTU21D';
        },
        labelStyle: function () {
            return this.name ? 'node_label_italic' : '';
        }
    });
</script>