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package com.diozero.devices;
/*
* #%L
* Organisation: diozero
* Project: Device I/O Zero - Core
* Filename: BH1750.java
*
* This file is part of the diozero project. More information about this project
* can be found at http://www.diozero.com/
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
import java.io.Closeable;
import com.diozero.api.I2CDevice;
import com.diozero.api.RuntimeIOException;
import com.diozero.util.SleepUtil;
/**
* BH1750 Luminosity sensor
* Datasheet
* Python code
*/
@SuppressWarnings("unused")
public class BH1750 implements LuminositySensorInterface, Closeable {
private static final int DEFAULT_ADDRESS = 0b010_0011;
// No active state.
private static final byte POWER_DOWN = 0b0000_0000;
// Waiting for measurement command.
private static final byte POWER_ON = 0b0000_0001;
// Reset Data register value. Reset command is not acceptable in Power Down mode.
private static final byte RESET = 0b0000_0111;
public static enum Mode {
// Start measurement at 1lx resolution. Measurement Time is typically 120ms.
CONTINUOUS_HIGH_RES_MODE((byte) 0b0001_0000, 120),
// Start measurement at 0.5lx resolution. Measurement Time is typically 120ms.
CONTINUOUS_HIGH_RES_MODE_2((byte) 0b0001_0001, 120),
// Start measurement at 4lx resolution. Measurement Time is typically 16ms.
CONTINUOUS_LOW_RES_MODE((byte) 0b0001_0011, 16),
// Start measurement at 1lx resolution. Measurement Time is typically 120ms.
// It is automatically set to Power Down mode after measurement.
ONE_TIME_HIGH_RES_MODE((byte) 0010_0000, 120),
// Start measurement at 0.5lx resolution. Measurement Time is typically 120ms.
// It is automatically set to Power Down mode after measurement.
ONE_TIME_HIGH_RES_MODE_2((byte) 0010_0001, 120),
// Start measurement at 4lx resolution. Measurement Time is typically 16ms.
// It is automatically set to Power Down mode after measurement
ONE_TIME_LOW_RES_MODE((byte) 0010_0011, 16);
private byte command;
private int measurementTimeMs;
private Mode(byte command, int measurementTimeMs) {
this.command = command;
this.measurementTimeMs = measurementTimeMs;
}
public byte getCommand() {
return command;
}
public int getMeasurementTimeMs() {
return measurementTimeMs;
}
}
private static final Mode DEFAULT_MODE = Mode.CONTINUOUS_HIGH_RES_MODE;
private I2CDevice device;
private Mode mode;
public BH1750(int controller) {
this(controller, DEFAULT_ADDRESS, DEFAULT_MODE);
}
public BH1750(int controller, int address) {
this(controller, DEFAULT_ADDRESS, DEFAULT_MODE);
}
public BH1750(int controller, int address, Mode mode) {
device = I2CDevice.builder(address).setController(controller).build();
setMode(mode);
}
@Override
public void close() {
device.close();
}
public Mode getMode() {
return mode;
}
public void setMode(Mode mode) {
device.writeByte(mode.getCommand());
SleepUtil.sleepMillis(mode.getMeasurementTimeMs());
this.mode = mode;
}
public void reset() {
device.writeByte(POWER_ON);
device.writeByte(RESET);
}
@Override
public float getLuminosity() throws RuntimeIOException {
return device.readUShort(mode.getCommand()) / 1.2f;
}
}