signal-control-utils

Utilities for signal processing and control theory in Javascript

Inside this library you will find these utilities:

1. Comparison
   Perform comparisons. Currently it has only the method "boolean near(value1, value2, diff)"

   var Comparison = require("signal-control-utils").Comparison;
   if(Comparison.near(10,11,2)) {
   console.info("10 is near 11 by less than 2!");
   }

2. MovingAverage
   Stablish a fixed size moving average, add samples and get the current average.

   var MovingAverage = require("signal-control-utils").MovingAverage;
   var speedAverager = new MovingAverage(10, function(avg) {console.info("A new sample was added. Current average is " + avg)});
   speedAverager.addSample(12);
   speedAverager.addSample(5);
   speedAverager.addSample(21);
   console.info("Final average: " + speedAverage.getAverage());
   

3. SchmittTrigger
   https://en.wikipedia.org/wiki/Schmitt_trigger

   var SchmittTrigger = require("signal-control-utils").SchmittTrigger;
   portSchmittTrigger = new SchmittTrigger(
   function(value) {
   console.info("Trigger activated at " + value);
   });
   portSchmittTrigger.setTriggerFixed(10);//only trigger on changes more than 10 from the last triggered value
   portSchmittTrigger.updateValue(0);//will trigger as this is the first call
   portSchmittTrigger.updateValue(4);//will not trigger
   portSchmittTrigger.updateValue(10);//will trigger
   portSchmittTrigger.updateValue(20);//will trigger
   portSchmittTrigger.updateValue(25);//will not trigger

4. SpeedMeter
   Measures speed based on positions set during time.

   var SpeedMeter = require("signal-control-utils").SpeedMeter;
   speedMeter = new SpeedMeter();
   speedMeter.updateValue(0);//position 0
   speedMeter.updateValue(4);//position 4
   speedMeter.updateValue(20);//position 20
   speedMeter.updateValue(25);//position 25
   console.info("Average speed is " + speedMeter.getCurrentSpeed());

More

See more usage examples at the "test" directory.
A complete example of how this can be used can be found https://github.com/flaviostutz/rpi-office-toys