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_P005_DHT.py
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_P005_DHT.py
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#!/usr/bin/env python3
#############################################################################
################### DHT11/22 plugin for RPIEasy &############################
#############################################################################
#
# Copyright (C) 2018-2019 by Alexander Nagy - https://bitekmindenhol.blog.hu/
#
import plugin
import webserver
import rpieGlobals
import rpieTime
import linux_os as OS
import misc
import Adafruit_DHT as DHT
class Plugin(plugin.PluginProto):
PLUGIN_ID = 5
PLUGIN_NAME = "Environment - DHT11/22/AM2302"
PLUGIN_VALUENAME1 = "Temperature"
PLUGIN_VALUENAME2 = "Humidity"
def __init__(self,taskindex): # general init
plugin.PluginProto.__init__(self,taskindex)
self.dtype = rpieGlobals.DEVICE_TYPE_SINGLE
self.vtype = rpieGlobals.SENSOR_TYPE_TEMP_HUM
self.readinprogress = 0
self.valuecount = 2
self.senddataoption = True
self.timeroption = True
self.timeroptional = False
self.formulaoption = True
self._nextdataservetime = 0
self.lastread = 0
self.samples = 9
self.preread = self.samples*2000 # 9 * 2 sec
self.TARR = []
self.HARR = []
def plugin_init(self,enableplugin=None):
plugin.PluginProto.plugin_init(self,enableplugin)
self.TARR = []
self.HARR = []
self.uservar[0] = 0
self.uservar[1] = 0
if self.enabled:
if self.interval>2:
nextr = self.interval-2
else:
nextr = 0
self._lastdataservetime = rpieTime.millis()-(nextr*1000)
self.lastread = 0
def webform_load(self): # create html page for settings
choice1 = self.taskdevicepluginconfig[0]
options = ["DHT11","DHT22/AM2302"]
optionvalues = [DHT.DHT11,DHT.DHT22]
webserver.addFormSelector("Sensor type","plugin_005_type",2,options,optionvalues,None,int(choice1))
webserver.addFormCheckBox("Oversampling","plugin_005_over",self.timer2s)
webserver.addFormNote("Strongly recommended to enable oversampling for reliable readings!")
return True
def webform_save(self,params): # process settings post reply
par = webserver.arg("plugin_005_type",params)
if par == "":
par = DHT.DHT22
self.taskdevicepluginconfig[0] = int(par)
if (webserver.arg("plugin_005_over",params)=="on"):
self.timer2s = True
else:
self.timer2s = False
return True
def timer_two_second(self):
if self.timer2s and self.initialized and self.readinprogress==0 and self.enabled:
if self._nextdataservetime-rpieTime.millis()<=self.preread:
self.readinprogress = 1
self.p005_get_value()
self.readinprogress = 0
return self.timer2s
def plugin_read(self): # deal with data processing at specified time interval
result = False
if self.initialized and self.readinprogress==0:
prevt = self.uservar[0]
prevh = self.uservar[1]
self.readinprogress = 1
self.p005_get_value()
if len(self.TARR)==1:
self.set_value(1,self.TARR[0],False)
if len(self.HARR)==1:
self.set_value(2,self.HARR[0],False)
if len(self.TARR)>1:
atemp = round((sum(self.TARR) / len(self.TARR)),3)
if ((max(self.TARR) - min(self.TARR)) > 2): # too much deviation found for temp
difft = abs(max(self.TARR) - atemp)
if (difft > abs(atemp-min(self.TARR))):
difft = abs(atemp-min(self.TARR))
if (difft < 1):
difft = 1
if (difft > 5):
difft = 5
TARR2 = []
for i in range(0,len(self.TARR)):
if (abs(atemp-self.TARR[i]) <= difft):
TARR2.append(self.TARR[i])
if len(TARR2)>0:
atemp = round((sum(TARR2) / len(TARR2)),3)
self.set_value(1,atemp,False)
if len(self.HARR)>1:
ahum = round((sum(self.HARR) / len(self.HARR)),2)
if ((max(self.HARR) - min(self.HARR)) > 4): # too much deviation for humidity
diffh = abs(max(self.HARR) - ahum)
if (diffh > abs(ahum-min(self.HARR))):
diffh = abs(ahum-min(self.HARR))
if (diffh < 2):
diffh = 2
if (diffh > 8):
diffh = 8
HARR2 = []
for i in range(0,len(self.HARR)):
if (abs(ahum-self.HARR[i]) <= diffh):
HARR2.append(self.HARR[i])
if len(HARR2)>0:
ahum = round((sum(HARR2) / len(HARR2)),2)
self.set_value(2,ahum,False)
if len(self.TARR)<1 or len(self.HARR)<1: # no value returned, cheating
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,"DHT read failed, using cached value!")
self.uservar[0] = prevt # avoid using formulas!
self.uservar[1] = prevh # avoid using formulas!
self._lastdataservetime = rpieTime.millis()
if float(self.uservar[0])!=0 and float(self.uservar[1])!=0:
self.plugin_senddata()
self._nextdataservetime = self._lastdataservetime + (self.interval*1000)
elif self.timer2s:
self._nextdataservetime = self._lastdataservetime + 6000 # force next try sooner if oversampling requested and read failed
self._lastdataservetime = self._nextdataservetime-(self.interval*1000)
# print(self.TARR,self.HARR) # DEBUG only!
self.TARR = []
self.HARR = []
result = True
self.readinprogress = 0
return result
def p005_get_value(self):
if rpieTime.millis()>=(self.lastread+2000):
humidity = None
temperature = None
try:
humidity, temperature = DHT.read(int(self.taskdevicepluginconfig[0]), int(self.taskdevicepin[0]))
except:
humidity = None
temperature = None
if humidity is not None and temperature is not None:
self.HARR.append(round(humidity, 2))
self.TARR.append(round(temperature, 3))
self.lastread = rpieTime.millis()