hdxxvxta: Initial implementation

This driver was developed using the Veris HD2NVSTA1 humidity
transmitter.  The 'T' variant supports a temperature transmitter as
well.  Both signals are provided by the device as analog 0-5Vdc or
0-10Vdc outputs.

The A1 variant supports a temperature range of -40C-50C, while the A2
variant supports a range of 0C-50C.  Humidity ranges for all devices
in this device family range from 0% to 100% (non-condensing).

Temperature measurement can be disabled by passing -1 as the
temperature analog pin to the constructor.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>

examples/javascript/hdxxvxta.js

@@ -0,0 +1,64 @@
+/*jslint node:true, vars:true, bitwise:true, unparam:true */
+/*jshint unused:true */
+
+/*
+ * Author: Jon Trulson <jtrulson@ics.com>
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+
+var sensorObj = require('jsupm_hdxxvxta');
+
+
+/************** Main code **************/
+
+console.log("Initializing...");
+
+// Instantiate an HDXXVXTA instance, using A1 for humidity and A0
+// for temperature
+var sensor = new sensorObj.HDXXVXTA(1, 0);
+
+// update and print available values every second
+setInterval(function()
+{
+    // update our values from the sensor
+    sensor.update();
+
+    // we show both C and F for temperature
+    console.log("Temperature:", sensor.getTemperature(),
+                "C /", sensor.getTemperature(true), "F");
+
+    console.log("Humidity:", sensor.getHumidity(), "%");
+
+    console.log("");
+
+}, 1000);
+
+
+process.on('SIGINT', function()
+{
+    sensor = null;
+    sensorObj.cleanUp();
+    sensorObj = null;
+    console.log("Exiting...");
+    process.exit(0);
+});