64 lines
1.7 KiB
Python
64 lines
1.7 KiB
Python
from platypush.plugins import action
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from platypush.plugins.gpio.sensor import GpioSensorPlugin
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class GpioSensorBme280Plugin(GpioSensorPlugin):
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"""
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Plugin to interact with a `BME280 <https://shop.pimoroni.com/products/bme280-breakout>`_ environment sensor for
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temperature, humidity and pressure measurements over I2C interface
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Requires:
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* ``pimoroni-bme280`` (``pip install pimoroni-bme280``)
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"""
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def __init__(self, port=1, **kwargs):
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"""
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:param port: I2C port. 0 = /dev/i2c-0 (port I2C0), 1 = /dev/i2c-1 (port I2C1)
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"""
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super().__init__(**kwargs)
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self.port = port
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self._bus = None
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self._device = None
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# noinspection PyPackageRequirements
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# noinspection PyUnresolvedReferences
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def _get_device(self):
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if self._device:
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return self._device
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from smbus import SMBus
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from bme280 import BME280
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self._bus = SMBus(self.port)
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self._device = BME280(i2c_dev=self._bus)
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return self._device
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@action
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def get_measurement(self):
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"""
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:returns: dict. Example:
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.. code-block:: python
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output = {
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"temperature": 21.0, # Celsius
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"pressure": 101555.08, # Pascals
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"humidity": 23.543, # percentage
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"altitude": 15.703 # meters
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}
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"""
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device = self._get_device()
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return {
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'temperature': device.get_temperature(),
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'pressure': device.get_pressure()*100,
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'humidity': device.get_humidity(),
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'altitude': device.get_altitude(),
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}
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# vim:sw=4:ts=4:et:
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