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_P153_MAX44009.py
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_P153_MAX44009.py
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#!/usr/bin/env python3
#############################################################################
##################### MAX44009 plugin for RPIEasy ###########################
#############################################################################
#
# Plugin based on code from:
# https://github.com/ControlEverythingCommunity/MAX44009/blob/master/Python/MAX44009.py
#
# Copyright (C) 2019 by Alexander Nagy - https://bitekmindenhol.blog.hu/
#
# Hardware device for this plugin implementation and testing provided by happytm.
# This plugin would never have been created without happytm! :)
#
import plugin
import webserver
import rpieGlobals
import rpieTime
import misc
import gpios
import time
class Plugin(plugin.PluginProto):
PLUGIN_ID = 153
PLUGIN_NAME = "Environment - MAX44009 ambient light sensor (TESTING)"
PLUGIN_VALUENAME1 = "Lux"
def __init__(self,taskindex): # general init
plugin.PluginProto.__init__(self,taskindex)
self.dtype = rpieGlobals.DEVICE_TYPE_I2C
self.vtype = rpieGlobals.SENSOR_TYPE_SINGLE
self.readinprogress = 0
self.valuecount = 1
self.senddataoption = True
self.timeroption = True
self.timeroptional = False
self.formulaoption = True
self._nextdataservetime = 0
self.lastread = 0
self.i2cbus = None
def plugin_init(self,enableplugin=None):
plugin.PluginProto.plugin_init(self,enableplugin)
self.uservar[0] = 0
if self.enabled:
try:
try:
i2cl = self.i2c
except:
i2cl = -1
self.i2cbus = gpios.HWPorts.i2c_init(i2cl)
if i2cl==-1:
self.i2cbus = gpios.HWPorts.i2cbus
if self.i2cbus is not None:
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.initialized = False
except Exception as e:
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,str(e))
self.initialized = False
self.i2cbus = None
def webform_load(self): # create html page for settings
choice1 = self.taskdevicepluginconfig[0]
options = ["0x4A"]
optionvalues = [0x4A]
webserver.addFormSelector("I2C address","plugin_153_addr",len(options),options,optionvalues,None,int(choice1))
webserver.addFormNote("Enable <a href='pinout'>I2C bus</a> first, than <a href='i2cscanner'>search for the used address</a>!")
return True
def webform_save(self,params): # process settings post reply
par = webserver.arg("plugin_153_addr",params)
if par == "":
par = 0x4A
self.taskdevicepluginconfig[0] = int(par)
return True
def plugin_read(self): # deal with data processing at specified time interval
result = False
if self.enabled and self.initialized and self.readinprogress==0:
self.readinprogress = 1
try:
val1 = self.read_max44009()
except Exception as e:
val1 = None
misc.addLog(rpieGlobals.LOG_LEVEL_ERROR,"MAX44009: "+str(e))
if val1 is not None:
self.set_value(1,val1,True)
self._lastdataservetime = rpieTime.millis()
result = True
self.readinprogress = 0
return result
def read_max44009(self):
if self.initialized:
try:
bus = self.i2cbus
except:
self.i2cbus = None
return None
v1 = None
try:
bus.write_byte_data(int(self.taskdevicepluginconfig[0]), 0x02, 0x40) # Select configuration register, 0x02(02), 0x40(64) Continuous mode, Integration time = 800 ms
time.sleep(0.5)
data = bus.read_i2c_block_data(int(self.taskdevicepluginconfig[0]), 0x03, 2) # Read data back from 0x03(03), 2 bytes, luminance MSB, luminance LSB
exponent = (data[0] & 0xF0) >> 4
mantissa = ((data[0] & 0x0F) << 4) | (data[1] & 0x0F)
luminance = ((2 ** exponent) * mantissa) * 0.045
except:
return v1
return luminance