BMW MkIV sat nav clock won't set - Page 2

geoff11 · 8th February 2009, 21:14

Count me in please :lol:

Kearton · 9th February 2009, 21:15

Quote:

Originally Posted by hans.schaaper

The issue of the missing BMW clock has been discussed before.
I think Keith put in an effort to have one made up.
I built my own with the help of Jochen Siegenthaler, known as KiwiJochen on Bimmerboard. He is also the author of NavCoder, an indispensable tool in the process.

Here's a picture.

[...]

This is a picture of the circuit.

[...]

It has a real-time clock with battery backup.
The time can be set from the boardmonitor.

The time is synchronized to GPS from my MK4 navcomputer.

Hans

Hi Hans,
this looks good. Does it allow you to use the timer / stopwatch function in the computer too?

Kearton

hans.schaaper · 10th February 2009, 21:28

The circuit design is my own.
It comprises an Ibus integrated circuit[Melexis TH3122], a microcontroller[PIC16F88] and a realtime clock chip[DS1307] with associated crystal and battery backup.

Kiwijochen provided me with the necessary info on the ibus messages involved in setting and displaying the time and date on the boardmonitor.
Jochen's help enabled me to write the software to program the microcontroller.

The software receives and decodes all messages on the bus.
On startup the navcomputer requests current time and date from the IKE [Instrument Cluster].
My circuit intercepts this request and replies, pretending to be the IKE.
After that it broadcasts the time and date message every minute.

Synchronizing to GPS time is a 'sexy' feature but the circuit works fine without it, with an accuracy equivalent to a quarz clock.

The Melexis TH3122 chip is difficult to source in small quantities. I got mine from Rolf Resler [the IBUS interface guy] at 10 euros a piece ex postage.
Soldering this chip is not everyone's cup of tea.

If sufficient members are interested I could have some pcb's made by a pcb shop.

Don't pin me down but I would 'guesstimate' a minimum cost of 50 euros for the board plus the parts.

Note:
The tripcomputer display and timer/stopwatch function on the boardmonitor should work but I can't be sure because I do not have it in my Instrument cluster.

Let me know what you think.

Hans

pmessling · 10th February 2009, 21:44

sounds good, i for one would be interested.

Ragman · 10th February 2009, 21:51

Me too - though would like to undestand full functionality offered - as well as an 'idiots guide' to fitting

juzza0 · 12th February 2009, 21:36

I'd have 2 of them Hans

geoff11 · 12th February 2009, 22:44

1 for me as well please :lol:

scgfull · 13th February 2009, 16:31

Hans,

You truly are a star, what with this clock for the Nav system and the temperature guage for the petrol freaks, you are really doing the club proud, Thank you.

Add me to the clock kit list please.

hans.schaaper · 13th February 2009, 19:59

Here's a 3D-model of the pcb I designed for the ibus clock.
The empty circular area to the right is where the battery holder for the 3V lithium cell is positioned. Can't find an image for that.
The board measures 48mm x 50mm approx.

The chip in the centre [TH3122] is the one that is difficult to source for a reasonable price.
I'm still looking, but no luck so far.
The chip top left [PIC16F88] is the 'brains' of it all, a programmable microprocessor.
The chip top right [DS1307] is a realtime clock with associated quarz and battery backup.

This circuit also works fine with the 4:3 headunit.

Will keep you posted.

Hans

juzza0 · 13th February 2009, 20:01

Thanks for the update Hans... your a real star!

10th February 2009, 21:28	#13
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	ibus clock, more info The circuit design is my own. It comprises an Ibus integrated circuit[Melexis TH3122], a microcontroller[PIC16F88] and a realtime clock chip[DS1307] with associated crystal and battery backup. Kiwijochen provided me with the necessary info on the ibus messages involved in setting and displaying the time and date on the boardmonitor. Jochen's help enabled me to write the software to program the microcontroller. The software receives and decodes all messages on the bus. On startup the navcomputer requests current time and date from the IKE [Instrument Cluster]. My circuit intercepts this request and replies, pretending to be the IKE. After that it broadcasts the time and date message every minute. Synchronizing to GPS time is a 'sexy' feature but the circuit works fine without it, with an accuracy equivalent to a quarz clock. The Melexis TH3122 chip is difficult to source in small quantities. I got mine from Rolf Resler [the IBUS interface guy] at 10 euros a piece ex postage. Soldering this chip is not everyone's cup of tea. If sufficient members are interested I could have some pcb's made by a pcb shop. Don't pin me down but I would 'guesstimate' a minimum cost of 50 euros for the board plus the parts. Note: The tripcomputer display and timer/stopwatch function on the boardmonitor should work but I can't be sure because I do not have it in my Instrument cluster. Let me know what you think. Hans

10th February 2009, 21:44	#14
pmessling Posted a thing or two TVR Join Date: Dec 2006 Location: West london Posts: 1,084 Thanks: 0 Thanked 0 Times in 0 Posts	sounds good, i for one would be interested. __________________ Peter Essling Project carbon fibre well under way http://i100.photobucket.com/albums/m.../Logo_260s.gif http://i100.photobucket.com/albums/m...ner468x60b.gif

10th February 2009, 21:51	#15
Ragman This is my second home ZT 260 SE Join Date: Oct 2008 Location: Ashington, West Sussex Posts: 3,512 Thanks: 2 Thanked 1 Time in 1 Post	Me too - though would like to undestand full functionality offered - as well as an 'idiots guide' to fitting __________________ I've learned that no matter how serious your life requires you to be, everyone needs a friend to act goofy with.

12th February 2009, 21:36	#16
juzza0 Mmm Monogram MG ZT-T++ & Rover 75 Connoisseur SE (Workhorse) Join Date: Feb 2008 Location: Nottingham Posts: 948 Thanks: 0 Thanked 1 Time in 1 Post	I'd have 2 of them Hans __________________ [SIGPIC][/SIGPIC]

13th February 2009, 16:31	#18
scgfull Loves to post none Join Date: Jun 2008 Location: resigned - but can't get off Posts: 286 Thanks: 0 Thanked 0 Times in 0 Posts	Hans, You truly are a star, what with this clock for the Nav system and the temperature guage for the petrol freaks, you are really doing the club proud, Thank you. Add me to the clock kit list please. __________________ Steve Memeber 4069

8th February 2009, 21:14	#11
geoff11 Loves to post ZT 260 Join Date: Mar 2007 Location: Stroud Glos Posts: 258 Thanks: 0 Thanked 0 Times in 0 Posts	Count me in please :lol:

12th February 2009, 22:44	#17
geoff11 Loves to post ZT 260 Join Date: Mar 2007 Location: Stroud Glos Posts: 258 Thanks: 0 Thanked 0 Times in 0 Posts	1 for me as well please :lol:

13th February 2009, 19:59	#19
hans.schaaper Avid contributor rover 75 2.5 V6 auto Join Date: Feb 2008 Location: Alkmaar Posts: 197 Thanks: 0 Thanked 3 Times in 3 Posts	an update Here's a 3D-model of the pcb I designed for the ibus clock. The empty circular area to the right is where the battery holder for the 3V lithium cell is positioned. Can't find an image for that. The board measures 48mm x 50mm approx. The chip in the centre [TH3122] is the one that is difficult to source for a reasonable price. I'm still looking, but no luck so far. The chip top left [PIC16F88] is the 'brains' of it all, a programmable microprocessor. The chip top right [DS1307] is a realtime clock with associated quarz and battery backup. This circuit also works fine with the 4:3 headunit. Will keep you posted. Hans

13th February 2009, 20:01	#20
juzza0 Mmm Monogram MG ZT-T++ & Rover 75 Connoisseur SE (Workhorse) Join Date: Feb 2008 Location: Nottingham Posts: 948 Thanks: 0 Thanked 1 Time in 1 Post	Thanks for the update Hans... your a real star! __________________ [SIGPIC][/SIGPIC]