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#
# Abstract sensor
# Copyright (c) 2020 Michael Büsch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
import bme280
import dht
import micropython
import time
from airhum import relhum2abshum
from curve import Curve
from micropython import const
from movingavg import MovingAvg
from util import lim
class SensorError(Exception):
pass
class SensorWrapper(object):
TYPE_TH = const(0)
TYPE_THP = const(1)
def __init__(self, *args, **kwargs):
self.args = args
self.kwargs = kwargs
self.dev = None
def close(self):
self.dev = None
class SensorWrapperDHT(SensorWrapper):
type = SensorWrapper.TYPE_TH
sleep = 2.0
def setup(self):
if not self.dev:
try:
dev = dht.DHT22(*self.args, **self.kwargs)
dev.measure()
self.dev = dev
except Exception as e:
return False
return True
def read(self):
dev = self.dev
try:
dev.measure()
t = lim(dev.temperature(), -40.0, 80.0)
h = lim(dev.humidity() * 1e-2, 0.0, 1.0)
except Exception as e:
raise SensorError(str(e))
return t, h
class SensorWrapperBME(SensorWrapper):
type = SensorWrapper.TYPE_THP
sleep = 0.0
def setup(self):
if not self.dev:
try:
self.dev = bme280.BME280(*self.args, **self.kwargs)
except bme280.BME280Error as e:
return False
return True
def close(self):
if self.dev:
self.dev.close()
super().close()
def read(self):
dev = self.dev
try:
return dev.readForced(filter=bme280.FILTER_2,
tempOversampling=bme280.OVSMPL_4,
humidityOversampling=bme280.OVSMPL_4,
pressureOversampling=bme280.OVSMPL_4)
except bme280.BME280Error as e:
raise SensorError(str(e))
class Sensor(object):
nullCurve = Curve()
def __init__(self,
name,
wrapper,
avgSize,
tCurve=None,
hCurve=None,
pCurve=None):
self.name = name
self.wrapper = wrapper
count = 2 + 1 if wrapper.type == SensorWrapper.TYPE_TH else 3 + 1
self.__movingAvgs = [ MovingAvg(avgSize) for _ in range(count) ]
self.__tCurve = tCurve or self.nullCurve
self.__hCurve = hCurve or self.nullCurve
if wrapper.type == SensorWrapper.TYPE_THP:
self.__pCurve = pCurve or self.nullCurve
def close(self):
self.wrapper.close()
def run(self):
wrapper = self.wrapper
if not wrapper.setup():
return None
if wrapper.sleep:
time.sleep(wrapper.sleep)
values = wrapper.read()
values = tuple(self.__movingAvgs[i](value)
for i, value in enumerate(values))
p = None
if wrapper.type == SensorWrapper.TYPE_TH:
t, h = values
else:
t, h, p = values
t = self.__tCurve.intp(t, lambda x, y: x)
h = self.__hCurve.intp(h, lambda x, y: x)
if wrapper.type == SensorWrapper.TYPE_THP:
p = self.__pCurve.intp(p, lambda x, y: x)
a = self.__movingAvgs[-1](relhum2abshum(h, t))
return t, h, a, p
# vim: ts=4 sw=4 expandtab
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