55 lines
1.9 KiB
Python
55 lines
1.9 KiB
Python
from platypush.backend.sensor import SensorBackend
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from platypush.context import get_plugin
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class SensorEnvirophatBackend(SensorBackend):
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"""
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Backend to poll analog sensor values from an MCP3008 chipset
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(https://learn.adafruit.com/raspberry-pi-analog-to-digital-converters/mcp3008)
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Requires:
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* ``envirophat`` (``pip install envirophat``)
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"""
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def __init__(self, temperature=True, pressure=True, altitude=True, luminosity=True,
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analog=True, accelerometer=True, magnetometer=True, qnh=1020, **kwargs):
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"""
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:param temperature: Enable temperature sensor polling
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:param pressure: Enable pressure sensor polling
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:param altitude: Enable altitude sensor polling
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:param luminosity: Enable luminosity sensor polling
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:param analog: Enable analog sensors polling
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:param accelerometer: Enable accelerometer polling
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:param magnetometer: Enable magnetometer polling
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:param qnh: Base reference for your sea level pressure (for altitude sensor)
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"""
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super().__init__(self, **kwargs)
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self.qnh = qnh
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self._last_read = {}
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self.enabled_sensors = {
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'temperature': temperature,
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'pressure': pressure,
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'altitude': altitude,
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'luminosity': luminosity,
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'analog': analog,
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'accelerometer': accelerometer,
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'magnetometer': magnetometer,
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}
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def get_measurement(self):
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plugin = get_plugin('gpio.sensor.envirophat')
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sensors = plugin.get_data(qnh=self.qnh).output
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ret = {
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sensor: sensors[sensor]
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for sensor, enabled in self.enabled_sensors.items()
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if enabled and sensor in sensors and sensors[sensor] != self._last_read.get(sensor)
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}
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self._last_read = sensors
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return ret
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# vim:sw=4:ts=4:et:
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