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How to build yourself a FBH controller
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alex_pescaru
 


Member Since: 19 Dec 2010
Location: Constanta
Posts: 253

Romania 
How to build yourself a FBH controller

Another project for the enthusiasts....

Considering the fact that on Discovery the Land Rover button on the fob can be programmed to turn on the low beam and also it's generally not used so much, I've made a little logic in order to use these things for starting the FBH.
Normally, the low beam is ON only when the ignition is ON. Well, the only time it will be ON when the ignition is OFF is when you press that button on the remote.
With a small microcontroller, in which I've implemented a part of the W-Bus serial protocol, I solved the problem.

Now, when you need the FBH, turn ON the low beam with the remote control for 2-3 seconds and that microcontroller sees that the lights were ON and then turned OFF after a short period of time when the ignition was OFF and turns the heater ON for 15 minutes.
I've put a limit of 15 minutes for battery health and anyway it's enough to bring the coolant temperature to 70-80 degrees.

In fact the logic is this:
- if the lights are turned on between 1 to 5 seconds, the FBH starts.
- if the lights are turned on between 5 to 15 seconds, the FBH stops.
- normal button/low beam usage of 30 seconds or more doesn't affect the FBH.

Below schematic diagram and hex file to be programmed into the microcontroller using any PIC programmer. (found on the net, some even home-made). The signals are self-explanatory.
Also the source code is available for those that want to improve it, but for many the PIC's firmware could be enough in order to get things done.

As a different approach, the LOW BEAM signal can be driven by any remote control (radio, GSM, etc) that can pulse that input for 2-3 seconds.
But the Land Rover button approach can be enough for the one that have the car on the driveway and sees its lights. The range of the fob is quite enough.

A few later words...
It is known that if you're using a 1533 timer, when you wake up the car, the FBH will stop.
Because this implementation is using, in its dialog with the FBH, the same addressing mode as the Webasto Thermo Test program, the FBH will keep running even if you're waking up the car with the remote or any other means.

Click image to enlarge


Hex file: http://www.freel2.com/gallery/albums/userpics/11383/1533.rar

Source code: http://www.freel2.com/gallery/albums/userpics/11383/wbus_pic.rar
 


UPDATE, November 16, 2014 - Version 1.06
http://www.disco3.co.uk/gallery/albums/use...r_v106.rar
This version has both a time limit (15 minutes) and a temperature target (75 degrees Celsius)
If you want to modify them, you can adjust them inside the source code (MINS_TO_RUN, MAX_TEMP) and then the sources must be recompiled.
This way things are optimized, meaning whichever condition is reached first will stop the FBH.
Any combination of conditions can be made.
For time limit only, set a target temperature to an unrealistic temperature, for example 150 degrees.
For temperature limit only, set a time limit to an unrealistic time, for example 250 minutes.

 
 There are only 2 things to make the universe work properly - Duct tape and WD40.
If it moves and it shouldn't - Duct tape. If it doesn't move and it should - WD40.
Everything else is just stuff.
 


Last edited by alex_pescaru on 17th Nov 2014 8:23 am. Edited 11 times in total 
Post #121807815th Jan 2014 7:14 pm
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A1GSS
 


Member Since: 12 Sep 2010
Location: Saffron Walden, Essex
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England 

Thumbs Up

I think I'm right in saying that amongst all the various ideas on this site, this is a unique solution...

No doubt someone will be along shortly to contradict me, but nonetheless - very neat.
 Graham
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Post #121808415th Jan 2014 7:18 pm
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Flack
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Nice Idea..

Flack Thumbs Up
 
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Post #121808615th Jan 2014 7:21 pm
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Bev
 


Member Since: 28 Apr 2011
Location: Perthshire
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Scotland 

So basically you can turn on the FBH using the landrover button on the Key?? That would be a great achievement Thumbs Up
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Last edited by Bev on 15th Jan 2014 10:02 pm. Edited 1 time in total 
Post #121809215th Jan 2014 7:24 pm
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maplecottage
 


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Why are some people so Censored clever

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Post #121813915th Jan 2014 8:16 pm
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Robbie
 


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Alex, that is genius - well done!

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Post #121816115th Jan 2014 8:30 pm
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wiggs
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Excellent Bow down

Might have to dust off my old pic programmer Very Happy

You should consider making some of these for sale ... It's a no brainer only having to carry one key fob Thumbs Up Thumbs Up
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Post #121816515th Jan 2014 8:32 pm
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nighthawk
 


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Amazing as always Alex Thumbs Up Thumbs Up

Where do you obtain detailed technical description about the wbus protocol (as detailed as needs to be to implement it)?

Really wanted to do this (ie. implement part of the protocol) a while ago but ended up getting a 1533 timer as I couldn't find any documentation about the protocol.
 Dennis

2006 Discovery 3 TDV6 Commercial Manual Buckingham Blue 


Last edited by nighthawk on 15th Jan 2014 8:51 pm. Edited 1 time in total 
Post #121818015th Jan 2014 8:42 pm
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alex_pescaru
 


Member Since: 19 Dec 2010
Location: Constanta
Posts: 253

Romania 

Thanks guys for the appreciations !

As for sale....
All it's a hobby and for me this means: concept, design, test, share, move on... So, no sale... Very Happy
But if anyone wants to do it, or to improve it, just go for it. As I've said, I will share the sources if needed.

It works on my Freely2. A couple of my friends also built it for their cars and I know of a Disco3 owner that had built it (with a small modification, another line driver).

W-Bus protocol: spy on a communication between a TTV and a 1533 timer and the internet
( http://sourceforge.net/projects/libwbus/ )
 There are only 2 things to make the universe work properly - Duct tape and WD40.
If it moves and it shouldn't - Duct tape. If it doesn't move and it should - WD40.
Everything else is just stuff.
 
 
Post #121818215th Jan 2014 8:47 pm
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Tufty
 


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Nice one Thumbs Up
  
Post #121819215th Jan 2014 8:57 pm
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blue meanie
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brilliant Thumbs Up
 and theeeeennn......???  
Post #121819315th Jan 2014 8:59 pm
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Moo
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Haven't a clue what you said but sounds good Thumbs Up

Can someone do this for me please?
  
Post #121825515th Jan 2014 10:40 pm
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tomthumb
 


Member Since: 04 Dec 2012
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I only understood the extra button can be used for the fbh.

Then I was completely lost Rolling with laughter Rolling with laughter Rolling with laughter
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Post #121826215th Jan 2014 11:11 pm
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SantaCruz
 


Member Since: 22 Jan 2012
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Hmmm.. might have to make me one of these as I can manufacture PCB boards and Program PIC's.... Wink
 Si  
Post #121826515th Jan 2014 11:17 pm
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Crost
 


Member Since: 29 Jan 2013
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And I'd buy one for the right price...

Oh and fool proof instructions Rolling with laughter
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Post #121826915th Jan 2014 11:21 pm
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