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- # Copyright 2016 by MPI-SWS and Data-Ken Research.
- # Licensed under the Apache 2.0 License.
- """
- This is a sensor for the tsl2591 lux (light level) sensor breakout board
- from Adafruit. It is a thin layer on top of python-tsl2591.
- To install the tsl2591 library:
- sudo apt-get install build-essential libi2c-dev i2c-tools python-dev libffi-dev
- sudo /usr/bin/pip install cffi
- git clone https://github.com/maxlklaxl/python-tsl2591.git
- """
- import tsl2591
- class LuxSensor:
- tsl = None
- def __init__(self, sensor_id=1):
- self.sensor_id = sensor_id
- if LuxSensor.tsl is None:
- LuxSensor.tsl = tsl2591.Tsl2591() # initialize the sensor context
- def sample(self):
- """Read the tsl2591 lux sensor and dispatch the luminosity value.
- """
- full, ir = LuxSensor.tsl.get_full_luminosity()
- lux = LuxSensor.tsl.calculate_lux(full, ir)
- # we convert the lux value to an integer - fractions are not
- # significant.
- return int(round(lux, 0))
- def __str__(self):
- return 'LuxSensor(%s)' % self.sensor_id
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