RoundedAmbientLightSensor.js

class RoundedAmbientLightSensor {
  constructor(frequency, threshold) {
    this.onchange_ = null;
    this.illuminance_ = null;
    this.sensor_ = new AmbientLightSensor({ frequency });
    this.sensor_.onchange = () => {
      let old_illuminance = this.illuminance_;
      if (this.sensor_.illuminance != null)
        this.illuminance_  = Math.ceil(this.sensor_.illuminance / threshold) * threshold;
      if (this.onchange_ != null 
          && this.illuminance_ != null
          && old_illuminance != this.illuminance_) {
        this.onchange_();
      }
    };
  }
  
  set onchange(func) { this.onchange_ = func; }
  get onchange() { return this.onchange_; }
  get illuminance() { return this.illuminance_; }
  get timestamp() { return this.sensor_.timestamp; }
  start() { this.sensor_.start(); }
  stop() { this.sensor_.stop(); }
}