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_P202_MCP9808.py
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_P202_MCP9808.py
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#!/usr/bin/env python3
#############################################################################
######################## MCP9808 plugin for RPIEasy #########################
#############################################################################
#
# MCP9808 code based on:
# https://github.com/ControlEverythingCommunity/MCP9808/blob/master/Python/MCP9808.py
#
# Copyright (C) 2019 by Alexander Nagy - https://bitekmindenhol.blog.hu/
#
import plugin
import webserver
import rpieGlobals
import rpieTime
import misc
import gpios
import smbus
import time
class Plugin(plugin.PluginProto):
PLUGIN_ID = 202
PLUGIN_NAME = "Environment - MCP9808 (TESTING)"
PLUGIN_VALUENAME1 = "Temperature"
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.bus = None
def plugin_init(self,enableplugin=None):
plugin.PluginProto.plugin_init(self,enableplugin)
self.uservar[0] = 0
self.bus = None
self.initialized = False
self.readinprogress=0
if self.enabled and int(self.taskdevicepluginconfig[0])>0:
try:
try:
i2cl = self.i2c
except:
i2cl = -1
self.bus = gpios.HWPorts.i2c_init(i2cl)
if i2cl==-1:
self.bus = gpios.HWPorts.i2cbus
if self.bus is not None:
if self.interval>2:
nextr = self.interval-2
else:
nextr = self.interval
config = [0x00, 0x00]
self.bus.write_i2c_block_data(int(self.taskdevicepluginconfig[0]), 0x01, config) # Select configuration register, 0x01(1) 0x0000(00) Continuous conversion mode, Power-up default
self.bus.write_byte_data(int(self.taskdevicepluginconfig[0]), 0x08, 0x03) # Select resolution register, 0x08(8) 0x03(03) Resolution = +0.0625 / C !!! MAX 4 TIMES/SEC!!!
self.initialized = True
self._lastdataservetime = rpieTime.millis()-(nextr*1000)
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,"MCP9808 init failed "+str(e))
self.initialized = False
def webform_load(self): # create html page for settings
choice1 = self.taskdevicepluginconfig[0]
options = ["0x18", "0x19", "0x1a", "0x1b", "0x1c","0x1d", "0x1e", "0x1f"]
optionvalues = [0x18, 0x19, 0x1a, 0x1b, 0x1c,0x1d, 0x1e, 0x1f]
webserver.addFormSelector("Address","plugin_202_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
initpar = self.taskdevicepluginconfig[0]
par = webserver.arg("plugin_202_addr",params)
if par == "":
par = 0
self.taskdevicepluginconfig[0] = int(par)
if (initpar != self.taskdevicepluginconfig[0]) and (int(self.taskdevicepluginconfig[0])>0):
self.plugin_init()
return True
def plugin_read(self): # deal with data processing at specified time interval
result = False
if self.initialized and self.readinprogress==0 and self.enabled:
self.readinprogress = 1
atemp = self.read_mcp9808()
if atemp is not None:
self.set_value(1,atemp,True)
self._lastdataservetime = rpieTime.millis()
result = True
self.readinprogress = 0
return result
def read_mcp9808(self):
temp = None
if self.bus is not None:
try:
data = self.bus.read_i2c_block_data(int(self.taskdevicepluginconfig[0]), 0x05, 2)
ctemp = ((data[0] & 0x1F) * 256) + data[1]
if ctemp > 4095:
ctemp -= 8192
temp = ctemp * 0.0625
except:
temp = None
return temp