Introduction

In the previous posts, I explained my motivation and how to setup FHEM with a jeelink (v3) USB RF stick.

Here I will describe how to connect the LaCrosse TX 29 IT temperature/humidity sensors to FHEM.

Requirements

• FHEM setup
• jeelink (v3)
• LaCrosse TX 29 ITDH sensor

Installation

The jeelink adapter can only handle one sketch per device. This is a limitation today but might change in the future. A sketch is, non-technically speaking, a definition used to adjust the device to particular sensor vendors.

1. Download Flash file (http://sourceforge.net/p/fhem/code/HEAD/tree/trunk/fhem/contrib/arduino/)

   cd /opt/fhem/contrib/arduino
   wget http://sourceforge.net/p/fhem/code/HEAD/tree/trunk/fhem/contrib/arduino/36_LaCrosse-LaCrosseITPlusReader.zip?format=raw -O 36_LaCrosse-LaCrosseITPlusReader.zip

2. Unzip FLASH file

   mkdir 36_LaCrosse-LaCrosseITPlusReader
   cd mkdir 36_LaCrosse-LaCrosseITPlusReader
   unzip ../36_LaCrosse-LaCrosseITPlusReader.zip

3. Flash (FHEM) for LaCrosse
   1. In version 5.5 of FHEM this has to be done manually.
      1. Install helper tool

         apt-get install avrdude

      2. Stop FHEM (just to ne on the save side)

         /etc/init.d/fhem stop

      3. Flash jeelink

          avrdude -p atmega328P -c arduino -P /dev/ttyUSB0 -D -U flash:w:/opt/fhem/contrib/arduino/36_LaCrosse-LaCrosseITPlusReader/HexFiles/LaCrosseITPlusReader10.hex

      4. Start FHEM

         /etc/init.d/fhem start

   2. In later versions you can do this more comfortable.
      1. In version 5.5 of FHEM this has to be done manually.

         attr myJeeLink0 hexFile /opt/fhem/contrib/arduino/36_LaCrosse-LaCrosseITPlusReader/HexFiles/LaCrosseITPlusReader10.hex

      2. Start flashing

         set myJeeLink0 flash

Register and Define Sensors

After installing you can power-up your sensor(s). Best is, to do it one-by-one to be able to identify them more easily.

When you put the batteries in the sensor, it gets a random identifier. This we use to assign information and setup data.

1. Put in Battery
2. Look in log for an unknown device
   tail -f log/fhem-2014-09.log

Define Temperature and Humidity Graph

1. Define the sensor directly in the config file fhem.cfg (is is much easier)

   ######################
   # Temperature / humidity sensors
   ## Office: 3D
   define 01Thermo LaCrosse 3D
   attr 01Thermo IODev myJeeLink0
   attr 01Thermo alias Office
   attr 01Thermo event-min-interval state:60
   attr 01Thermo group Temperatures
   attr 01Thermo icon scene_office
   attr 01Thermo room Plots
   #attr 01Thermo doAverage 1
   
   define FileLog_01Thermo FileLog ./log/01Thermo-%Y.log 01Thermo:T:.*
   attr FileLog_01Thermo logtype temp4hum6:Temp/Hum,text
   
   define weblink_01Thermo SVG FileLog_01Thermo:weblink_01Thermo:CURRENT
   attr weblink_01Thermo alias Office
   attr weblink_01Thermo title "Office"
   attr weblink_01Thermo label "Temp. min.: $data{min1} °C, max: $data{max1} °C, Last: $data{currval1} °C __ Hum. min.: $data{min2} %, max: $data{max2} %, Last: $data{currval2} %"
   attr weblink_01Thermo room Plots

I had some problems, that FHEM was complaining about not finding weblink_01Thermo.gplot. To solve this, I played around a little and came up with the following solution – not nice but working:

Track Battery status

1. Define the sensor directly in the config file fhem.cfg (is is much easier)

   # LaCrosse Battery reading
   define rg_battery readingsGroup TYPE=LaCrosse:battery
   attr rg_battery alias Batteriestatus
   attr rg_battery commands { "battery.low" => "set %DEVICE replaceBatteryForSec 60" }
   attr rg_battery valueIcon {'battery.ok' => 'batterie', 'battery.low' => 'batterie\@red'}

 

Final Words

I added about 7 sensors and everything works fine. I am not yet happy about the log, because sometimes there is no entry for much more than 1 minute.