Sensor TSL45315 for node.js

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A node.js module for working with the light sensor TSL45315 via i2c.

About the sensor

The TSL45315 is an ambient light sensing (ALS) device that approximates human eye response under a variety of lighting conditions with a wide dynamic range and direct 16-bit lux output via an I2C bus. A breakout with the sensor is available at watterott (Germany) or watterott (COM). This driver/module based on the latest datasheet from ams.

Install

$ npm install sensor_tsl45315

Raspberry PI

Enable i2c on your Pi if you haven't done already. To avoid having to run the i2c tools as root add the ‘pi’ user to the i2c group:

sudo adduser pi i2c

Usage

The module is easy to use. You have different config-options

Simple Usage

var TSL45315 = require('sensor_tsl45315');

var sense = new TSL45315();
sense.init(function(err, val) {
  if (!err) {
    sense.getLux(function(error, val) {
      if (!error) console.log(val + ' lux');
    });    
  }
});

Don't forget to call init()

ìnit() powers up the sensor and sets the given options.

Options

The default options are:

{
  'debug': false,
  'address': 0x29,
  'device': '/dev/i2c-1',
  'powerMode': 'normalMode',
  'timingMode': '400ms',
  'psaveskipMode': 0,
}

Configure the sensor by supplying an options object to the constructor like:

var sense = new TSL2561({
    'timingMode': '200ms',
    'psaveskipMode': 1
});

Getter & Setter for sensor settings

Getter supports only callbacks. Setter supports callbacks and event-emitters - sensorSettingChanged and sensorSettingFailed. Getter and setter are:

getPowerMode(cB) / setPowerMode(newMode, [cB]) / modes: 'normalMode', 'powerDown', 'runSingle'
getTimingMode(cB) / setTimingMode(newMode, [cB]) / modes: '100ms', '200ms', '400ms'
getPSaveSkipMode(cB) / setPSaveSkipMode(newMode, [cB]) / modes: 0, 1

The sensorId is only a getter:

getSensorId(cB) / return value 'TSL45317', 'TSL45313', 'TSL45315' or 'TSL45311' on success

Light-Measurements

Measurement-functions using a callback and getAllValues([cB]) an event-emitter too. All events including a timestamp and additional data like the address to determine the sensor, who emitted the event.

• getLux([cB]) - sensors lux value - emits event newSensorValue on success or sensorValueError on error
• getAllValues([cB]) - all values (raw and calculated) - emits event newSensorValues on success or sensorValuesError on error

Tests

Because it's not really a good idea to run test in an unknown environment all tests under test using a faked devices and not really your i2c bus. The faked device using a faked i2c-bus which is realised with the proxyquire module.

To run the complete test suite nodeunit is required. The best way is using grunt and the shipped gruntfile which comes with this module.

Examples

All examples are using a real device on address 0x29 on your i2c bus. Be carefully if you have more as one device on your i2c or/and if you don't use the default address for the sensor.

Licence

The licence is GPL v3 and the module is available at Bitbucket and GitHub.