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This HTML script will give you a gauge that will change color based on the value of the scale in percentage.
The script below has a scale range 0-5000. (I use it to measure my KWH usage)....

Here is the trick i experimented with

limitMax: 'false', 
  percentColors: [[0.0, "#a9d70b" ], [0.80, "#f9c802"], [1.0, "#ff0000"]], // !!!!
  strokeColor: '#b0b0b0',
    generateGradient: true

From 0% - 80% the scale is green to yellow at the 80%, the from 80%-100% it will rapidly change to red....

Green: #a9d70b
Orange #f9c802
Red #ff0000

I also made the value font, bold by adding this ; font-weight:bold

And with this line you can set the maximum value of the gauge gauge.maxValue = 5000; lower it to something that comes close to the max value you want to measure.

Really nice effect!

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<div id="wrapper" style="text-align: center">    
  <canvas id="my-gauge-${uuid}" style="display: inline-block;"></canvas>
  <div style="font-size:21px ; font-weight:bold" id="textfield--${uuid}"></div>
</div>
<script>
  var opts = {
      lines: 12,
  angle: 0.05,
  lineWidth: 0.44,
  pointer: {
    length: 0.9,
    strokeWidth: 0.035,
    color: '#303030'
    },
limitMax: 'false', 
  percentColors: [[0.0, "#a9d70b" ], [0.80, "#f9c802"], [1.0, "#ff0000"]], // !!!!
  strokeColor: '#b0b0b0',
    generateGradient: true
  };
  var target = document.getElementById('my-gauge-${uuid}'); // your canvas element
  var gauge = new Gauge(target).setOptions(opts); // create sexy gauge!
  gauge.animationSpeed = 3; // set animation speed (32 is default value)
  gauge.maxValue = 5000; //Maximum value
  gauge.setTextField(document.getElementById("textfield--${uuid}"));
  gauge.set(${temperatureSen.value}); // set actual value
</script>

<!--see http://jsfiddle.net/berni/Yb4d7/ for example-->

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Redferne

@jkandasa

Thanks for showing this. It makes it very versatile. However for the Temperature example above, how do I get all decimals? I'd like the Temperature to show for example "23.45°C"

///Redferne

jkandasa

@Redferne

how do I get all decimals? I'd like the Temperature to show for example "23.45°C"

I guess it is limitation of http://bernii.github.io/gauge.js/dist/gauge.min.js or we may have some option to show decimal points. Kindly refer http://bernii.github.io/gauge.js

Redferne

@jkandasa

Nope, Gauge handles decimals and negative values just fine. See here:
http://jsfiddle.net/berni/smNjl/

jkandasa

@Redferne

Can you try this line

  gauge.set(${temperatureSen.value}); // set actual value

with this,

  gauge.set(parseFloat(${temperatureSen.value})); // set actual value

Redferne

@jkandasa said:

gauge.set(parseFloat(${temperatureSen.value}));

Solution was little more complicated:

<div id="wrapper" style="text-align: center">    
  <canvas id="my-gauge-${uuid}" style="display: inline-block;"></canvas>
  <div style="font-size:21px" id="textfield--${uuid}"></div>
</div>
<script>
  var CustomTextRenderer = function(el){
    this.el = el;
    this.render = function(gauge) {
      this.el.innerHTML = gauge.displayedValue.toPrecision(3);
     }
  }
  CustomTextRenderer.prototype = new TextRenderer();
  var cs = new CustomTextRenderer(document.getElementById("textfield--${uuid}"));
  var opts = {
    lines: 32,
    angle: 0,
    lineWidth: 0.24,
    pointer: {
      length: 0.9,
      strokeWidth: 0.035,
      color: '#000066'
    },
    limitMax: 'false', 
    percentColors: [[0.0, "#2B31CF" ], [0.60, "#37CF32"], [1.0, "#ff0000"]],
    strokeColor: '#E0E0E0',
    generateGradient: true
  };
  var target = document.getElementById('my-gauge-${uuid}');
  var gauge = new Gauge(target).setOptions(opts);
  gauge.animationSpeed = 3;
  gauge.maxValue = 40.0;
  gauge.setMinValue(-30.0);
  gauge.setTextField(new CustomTextRenderer(document.getElementById("textfield--${uuid}")))
  gauge.set(${temperatureSen.value});
</script>

esawyja

Hi all,
Brilliant program @jkandasa , I'm having some issues with the gauge display, I don't see the gauge when I test the template. I'm using Firefox, cleared the history and cache. even tried it with Microsoft Edge, but my gauge does not display. Rebooted the RaspBerry PI as well, I don't see any errors in the logs etc, could someone point me in the right direction please, see screenshots below
Regards

esawyja

The location of the gauge.min.js

jkandasa

@esawyja You have to add gauge.min.js as mentioned here,
0_1470030993827_upload-7a773b78-c825-47f5-9784-c8a9a830a015 .

Once done, reload your browser.

esawyja

Hi
Sorry yes I did, I just forgot to include the screenshot, still not seeing the gauge, any other suggestions please

jkandasa

@esawyja can you post your gauge HTML template and javaScript code?

esawyja

Sure, see below

Below is the template file

<div id="wrapper" style="text-align: center">    
  <canvas id="my-gauge-${uuid}" style="display: inline-block;"></canvas>
  <div style="font-size:21px" id="textfield--${uuid}"></div>
</div>
<script>
  var CustomTextRenderer = function(el){
    this.el = el;
    this.render = function(gauge) {
      this.el.innerHTML = gauge.displayedValue.toPrecision(3);
     }
  }
  CustomTextRenderer.prototype = new TextRenderer();
  var cs = new CustomTextRenderer(document.getElementById("textfield--${uuid}"));
  var opts = {
    lines: 32,
    angle: 0,
    lineWidth: 0.24,
    pointer: {
      length: 0.9,
      strokeWidth: 0.035,
      color: '#000066'
    },
    limitMax: 'false', 
    percentColors: [[0.0, "#2B31CF" ], [0.60, "#37CF32"], [1.0, "#ff0000"]],
    strokeColor: '#E0E0E0',
    generateGradient: true
  };
  var target = document.getElementById('my-gauge-${uuid}');
  var gauge = new Gauge(target).setOptions(opts);
  gauge.animationSpeed = 3;
  gauge.maxValue = 40.0;
  gauge.setMinValue(-30.0);
  gauge.setTextField(new CustomTextRenderer(document.getElementById("textfield--${uuid}")))
  gauge.set(${temperatureSen.value});
</script>

jkandasa

@esawyja I use this lib and works as expected for your script, https://cdnjs.cloudflare.com/ajax/libs/gauge.js/1.2.1/gauge.min.js

0_1483441169722_upload-ea83be23-e0e8-44dd-8622-a64a9d44d960

esawyja

mmmh ok, then it must be something else

Still getting nothing

Even using Microsoft edge after clearing browser cache, history etc

esawyja

This is how I clear the cache

jkandasa

@esawyja I have updated this script on our demo server too. You can have a look at http://demo.mycontroller.org/#/dashboard, you can see a dashboard named esawyja

Steps:

Create UID tag for your temperature sensor
Create Javascript to return value to HTML template
Create HTML template
Add you javaScript on script files, reload MC server page on your browser
Create custom widget with template(step#3) and script(step#2), done!

IMPORTANT: I believe you are with latest SNAPSHOT version.

esawyja

aaah ok, so it is something on my computer locally, do you need any external programs etc to display this, I don't see the gauge on the demo server either

jkandasa

@esawyja Yes, I see the issue with firefox. I am most of the time with google chrome, hence did not notice this issue.

Thank you for your patience. I will check why this is not happening in FF browser.

esawyja

No thank you for the wonderful support, let me download Chrome and see what happens

esawyja

Ok confirmed, issue is with FF, works with Chrome

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