HysteresisController

HysteresisController.js

class HysteresisController {

    /**
     * 
     * @param {Object} options Options array
     * @param {Function} onChange Function to call when the state should change
     */
    constructor(options, onChange) {
        this.targetTemperature = options.targetTemperature;
        this.min = options.min;
        this.max = options.max;
        this.minBand = options.minBand;
        this.maxBand = options.maxBand;

        this.onChange = onChange;

        this.previousState = 'off';
    }

    /**
     * Calculates a new state and calls the callback on change. Call this
     * as often as possible.
     * @param {Number} currentTemperature The current measured temperature
     */
    calculateState(currentTemperature) {
        if(currentTemperature < this.min - this.minBand) {
            if(this.previousState != 'off') {
                this.previousState = 'off';
                this.onChange('off');
            }
        } else if(currentTemperature > this.max - this.maxBand) {
            if(this.previousState != 'on') {
                this.previousState = 'on';
                this.onChange('on');
            }
        }
    }
}