Node-Red module to use ezChronos in INPUT pallette

89-chronos.html

<!-- Swapan Sarkar <swapan@yahoo.com> -->
<script type="text/x-red" data-template-name="chronos">
    <div class="form-row">
        <label for="node-input-topic"><i class="fa fa-tasks"></i> Topic</label>
        <input type="text" id="node-input-topic" placeholder="Topic">
    </div>

    <br/>
    <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>


<script type="text/x-red" data-help-name="chronos">
   <p>Chronos input node. It gets accelerator and button data from the
   ez430-chronos watch using the USB dongle attached to the RPi running
   NODE-RED.</p>
   <p>Outputs an object called <b>msg</b> containing <b>msg.topic</b> and
   <b>msg.payload</b>. msg.payload has the JSON object {"b":value, "x":
   value, "y":value, "z":value}.</p>
</script>

<script type="text/javascript">
    RED.nodes.registerType('chronos',{
        category: 'input',      // the palette category
        defaults: {             // defines the editable properties of the node
            name: {value:""},   //  along with default values.
            topic: {value:""}
        },
        inputs:0,               // set the number of inputs - only 0 or 1
        outputs:1,              // set the number of outputs - 0 to n
        // set the icon (held in icons dir below where you save the node)
        icon: "myicon.png",     // saved in  icons/myicon.png
        color: "#3FADB5",
        label: function() {     // sets the default label contents
            return this.name||this.topic||"chronos";
        },
        labelStyle: function() { // sets the class to apply to the label
            return this.name?"node_label_italic":"";
        }
    });
</script>

89-chronos.js

// Node-RED node file for ezChronos


module.exports = function(RED) {
    "use strict";
    var chronos = require("ez430");

    function ChronosNode(n) {
        RED.nodes.createNode(this,n);
        this.topic = n.topic;

        var node = this;
        try {
            node.chronos = new chronos();

            var msg = {};
            msg.topic = this.topic;
            msg.payload = "Hello from ezChronos module !"
            this.send(msg);

            // respond to inputs....
            //this.on('input', function (msg) {
            //    node.warn("I saw a payload: "+msg.payload);
            //    node.send(msg);
            //});
            this.chronos.on('chronosData', function (b, x, y, z) {
                msg.payload = {'b':b, 'x':x, 'y':y, 'z':z};
                node.send(msg);
            });

        } catch (err) { node.warn("can't open Chronos device."); }
        this.on("close", function() {
            node.chronos.close();
        });
    };

    // Register the node by name. This must be called before overriding any of the
    // Node functions.
    RED.nodes.registerType("chronos",ChronosNode);

}

README.md

node-red-contrib-ezChronos

A Node-RED node to capture data from ez430-chronos watch.

Usage

ezChronos post.

The msg.payload will contain 4 values if available. They are 1) button pressed code 2) accelerometer X value 3) Y value and 4) Z value in JSON object e.g. { "b":value, "x":value, "y":value, "z":value }

package.json

{
    "name": "node-red-contrib-ezChronos",
    "version": "0.0.1",
    "description": "A Node-RED node to capture data from the ez430-chronos watch.",
    "dependencies": {
        "ez430": "0.0.x"
    },
    "license": "MIT",
    "keywords": [ "node-red", "ezChronos" ],
    "node-red": {
        "nodes": {
            "ezChronos": "89-chronos.js"
        }
    },
    "author": {
        "name": "Swapan Sarkar",
        "email": "swapan@yahoo.com",
    }
}