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dirkvl	2013-10-06 , 21:55
Posts: 1,104 \| Thanked: 5,652 times \| Joined on Feb 2010 @ Holland	#31

Originally Posted by mikecomputing

hmm why do you need as much as 16 ioports? AFAIK N900 did use around 4 form the HWKBD
However there is one with more pins than the one I gave. I still think that ARM is cooler to use because you can extend to not only HWKBD

No, it uses 16 inputs (8 row, 8columns) that go through an ESD-protector and then to GAIA. Check out page 7.
The ARM chip would be cooler indeed. If you can figure out how to make a pcb for it and power it with some nice software, we can use it in version 2!

Originally Posted by minimos

Yes, but if your proof-of-concept starts with a poor usability level (e.g. you would be forced to open the keyboard to take a photo), the project IMHO won't go anywhere.

The level of problemsolving is not very high here. How about.... TWO HOLES! BAM BAM BAMMMMMMM!!!!

Also:

Originally Posted by dirkvl

The keyboard keys are only 19mm high, so it will be no problem to incorporate holes in the OH for the camera. However, solving hardware issues like this is not priority at the moment. Lets get a proof-of-concept first!

Last edited by dirkvl; 2013-10-06 at 22:07.

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dirkvl	2013-10-07 , 09:54
Posts: 1,104 \| Thanked: 5,652 times \| Joined on Feb 2010 @ Holland	#32

Originally Posted by Egon

I'm sorry for this spam in this "prototype first, options later" thread. But I could not find a better post to comment. And my idea supports "your" holes which can be added later, after making the prototype.

Tadaaaa
http://talk.maemo.org/showthread.php?p=1379125

My double-sided pcb's and i2c-chip will arrive tomorrow, so is anyone has any suggestions/useful tips about pcb design and prototype functionality: speak up! At this moment the prototype will feature the N900 keyboard (3x13 keys), a i2c i/o expander, some resistors for pull-up logic, external connection for i2c connection to RPi and an on/off switch on the board (testing for recognition whether keyboard is connected).

Last edited by dirkvl; 2013-10-07 at 10:01.

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	Daneel	2013-10-07 , 10:43
	Posts: 549 \| Thanked: 698 times \| Joined on Apr 2010	#33

Can a mod please remove this stupid tag?

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dirkvl	2013-10-07 , 10:47
Posts: 1,104 \| Thanked: 5,652 times \| Joined on Feb 2010 @ Holland	#34

PCB-design sketch;

Top-side:

Bottom:

Both sides:

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dirkvl	2013-10-07 , 10:50
Posts: 1,104 \| Thanked: 5,652 times \| Joined on Feb 2010 @ Holland	#35

Originally Posted by Daneel

Can a mod please remove this stupid tag?

Would be nice! And perhaps for clarity change title to 'Building OtherHalf keyboard prototype'

	Mikkosssss	2013-10-07 , 11:11
	Posts: 645 \| Thanked: 519 times \| Joined on Apr 2012 @ Finland	#36

Originally Posted by dirkvl

Would be nice! And perhaps for clarity change title to 'Building OtherHalf keyboard prototype'

I think you can edit title.

Just edit first post.

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TemeV	2013-10-07 , 16:54
Posts: 121 \| Thanked: 231 times \| Joined on Oct 2013	#37

I could help with the PCB design, since I design them for a living

Is there information about the keyboard of N900 available somewhere?

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DeeGee	2013-10-07 , 17:13
Posts: 156 \| Thanked: 239 times \| Joined on Sep 2009 @ Finland	#38

I guess the best source is the service manual that dirkvl linked to already?
http://www.s-manuals.com/manuals/pho...ematics_v2.pdf

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TemeV	2013-10-07 , 17:33
Posts: 121 \| Thanked: 231 times \| Joined on Oct 2013	#39

Originally Posted by DeeGee

I guess the best source is the service manual that dirkvl linked to already?
http://www.s-manuals.com/manuals/pho...ematics_v2.pdf

I missed that one. Thanks.

dirkvl	2013-10-07 , 22:14
Posts: 1,104 \| Thanked: 5,652 times \| Joined on Feb 2010 @ Holland	#40

Originally Posted by TemeV