bh1750.h

/*
   Copyright (C) AC SOFTWARE SP. Z O.O
 
   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; either version 2
   of the License, or (at your option) any later version.
 
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
 
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
   */
 
// Dependency: Please install "BH1750" by Christopher Laws library in Arduino:
// https://github.com/claws/BH1750
 
#ifndef SRC_SUPLA_SENSOR_BH1750_H_
#define SRC_SUPLA_SENSOR_BH1750_H_
 
#include <supla/sensor/general_purpose_measurement.h>
 
#include <math.h>
#include <BH1750.h>
#include <supla/log_wrapper.h>
 
namespace Supla {
namespace Sensor {
class Bh1750 : public GeneralPurposeMeasurement {
 public:
  explicit Bh1750(int i2cAddress = 0x23)
      : GeneralPurposeMeasurement(nullptr, false), sensor(i2cAddress) {
    setDefaultUnitAfterValue("lx");
    getChannel()->setDefaultIcon(14);
  }
 
  void initializeSensor() {
    if (sensor.begin()) {
      SUPLA_LOG_DEBUG("BH1750[%d]: initialized", getChannelNumber());
    } else {
      SUPLA_LOG_WARNING("BH1750[%d]: not found or other error",
                        getChannelNumber());
    }
  }
 
  void onInit() override {
    initializeSensor();
 
    channel.setNewValue(getValue());
  }
 
 protected:
  double getValue() override {
    double value = sensor.readLightLevel();
    if (isnan(value) || value <= 0) {
      invalidCounter++;
      if (invalidCounter < 4) {
        return lastValue;
      } else {
        // try to init again
        invalidCounter = 0;
        initializeSensor();
      }
      lastValue = NAN;
      return lastValue;
    }
    invalidCounter = 0;
    lastValue = value;
    return value;
  }
 
  BH1750 sensor;
 
  double lastValue = NAN;
  int invalidCounter = 0;
};
 
}  // namespace Sensor
}  // namespace Supla
 
#endif  // SRC_SUPLA_SENSOR_BH1750_H_