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_P051_AM2320.py
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_P051_AM2320.py
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#!/usr/bin/env python3
#############################################################################
######################## AM2320 plugin for RPIEasy ##########################
#############################################################################
#
# Copyright (C) 2018-2019 by Alexander Nagy - https://bitekmindenhol.blog.hu/
#
import plugin
import webserver
import rpieGlobals
import rpieTime
import misc
import gpios
import smbus
import time
def _combine_bytes(msb, lsb):
return msb << 8 | lsb
class Plugin(plugin.PluginProto):
PLUGIN_ID = 51
PLUGIN_NAME = "Environment - AM2320"
PLUGIN_VALUENAME1 = "Temperature"
PLUGIN_VALUENAME2 = "Humidity"
ADDR=0x5c
def __init__(self,taskindex): # general init
plugin.PluginProto.__init__(self,taskindex)
self.dtype = rpieGlobals.DEVICE_TYPE_I2C
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 = 3
self.preread = self.samples*2000 # 3 * 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:
try:
i2cok = gpios.HWPorts.i2c_init()
if i2cok:
if self.interval>2:
nextr = self.interval-2
else:
nextr = self.interval
self._lastdataservetime = rpieTime.millis()-(nextr*1000)
self.lastread = 0
else:
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,"I2C can not be initialized!")
self.enabled = False
except Exception as e:
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,str(e))
self.enabled = False
def webform_load(self): # create html page for settings
webserver.addFormNote("I2C address is fixed 0x5c! You can check it at <a href='i2cscanner'>i2cscan</a> page.")
webserver.addFormCheckBox("Oversampling","plugin_051_over",self.timer2s)
webserver.addFormNote("It is not strictly necessary as AM2320 gives stable output values!")
return True
def webform_save(self,params): # process settings post reply
if (webserver.arg("plugin_051_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.p051_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.p051_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,"AM2320 read failed, using cached value!")
self.set_value(1,prevt,False)
self.set_value(2,prevh,False)
if float(self.uservar[0])!=0 and float(self.uservar[1])!=0:
self.plugin_senddata()
# print(self.TARR,self.HARR) # DEBUG only!
self.TARR = []
self.HARR = []
self._lastdataservetime = rpieTime.millis()
self._nextdataservetime = self._lastdataservetime + (self.interval*1000)
result = True
self.readinprogress = 0
return result
def readam2320(self):
bus = gpios.HWPorts.i2cbus
temp = None
humi = None
try:
bus.write_quick(self.ADDR)
except:
pass
time.sleep(0.001)
try:
bus.write_word_data(self.ADDR,0x03,0x0400)
except:
return (temp, humi)
time.sleep(0.0016)
data = bus.read_i2c_block_data(self.ADDR,0x03)
if data[0] != 0x03 or data[1] != 0x04:
return (temp, humi)
if len(data)>7:
temp = _combine_bytes(data[4], data[5])
if temp & 0x8000:
temp = -(temp & 0x7FFF)
temp /= 10.0
humi = _combine_bytes(data[2], data[3]) / 10.0
return (temp, humi)
def p051_get_value(self):
if rpieTime.millis()>=(self.lastread+2000):
humidity = None
temperature = None
try:
temperature, humidity = self.readam2320()
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()