BH1750 driver for Android Things

This driver supports ROHM BH1750 ambient light sensor.

NOTE: these drivers are not production-ready. They are offered as sample implementations of Android Things user space drivers for common peripherals as part of the Developer Preview release. There is no guarantee of correctness, completeness or robustness.

How to use the driver

Gradle dependency

To use the bh1750 driver, simply add the line below to your project's build.gradle, where <version> matches the last version of the driver available on jcenter.

dependencies {
    compile 'com.alvarowolfx.androidthings:driver-bh1750:<version>'
}

Sample usage

import com.alvarowolfx.androidthings.driver.bh1750.Bh1750;

// Access the ambient light sensor:

Bh1750 mBh1750;

try {
    mBh1750 = new Bh1750(i2cBusName);
} catch (IOException e) {
    // couldn't configure the device...
}

// Read the current light level:

try {
    float lightLevel = mBh1750.readLightLevel();
} catch (IOException e) {
    // error reading light level
}

// Close the ambient light sensor when finished:

try {
    mBh1750.close();
} catch (IOException e) {
    // error closing sensor
}

If you need to read sensor values continuously, you can register the BH1750 with the system and listen for sensor values using the Sensor APIs:

SensorManager mSensorManager = getSystemService(Context.SENSOR_SERVICE);
SensorEventListener mListener = ...;
Bh1750SensorDriver mSensorDriver;

mSensorManager.registerDynamicSensorCallback(new SensorManager.DynamicSensorCallback() {
    @Override
    public void onDynamicSensorConnected(Sensor sensor) {
        if (sensor.getType() == Sensor.TYPE_LIGHT) {
            mSensorManager.registerListener(mListener, sensor,
                    SensorManager.SENSOR_DELAY_NORMAL);
        }
    }
});

try {
    mSensorDriver = new Bh1750SensorDriver(i2cBusName);
    mSensorDriver.registerLightSensor();
} catch (IOException e) {
    // Error configuring sensor
}

// Unregister and close the driver when finished:

mSensorManager.unregisterListener(mListener);
mSensorDriver.unregisterLightSensor();
try {
    mSensorDriver.close();
} catch (IOException e) {
    // error closing sensor
}

Schematic

License

Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.