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Posts: 161 | Thanked: 172 times | Joined on Mar 2013
#11
Could we see a picture of both an original n900 and one with the spacer frame (neo900), just to see the difference between them.
 

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#12
I only have one N900 here, and all the spacer frame prototypes (at the moment, the one shown and an earlier one). But at the camp we should have plenty of devices to "upgrade". Then we can snap some pictures. Good idea, thanks !

- Werner
 

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#13
We have updated the NFC draft, mainly with details needed for the upcoming implementation:

https://neo900.org/stuff/papers/nfc-draft.pdf

The main changes:
- introduce KL16 as KL26 alternative (adds dual-SWP capability)
- clarify use of TRF7970A EN and EN2 pins
- add discussion of NXP CLRC663
- assume that a SIM does not need full activation before use with SWP
- fixed incorrect Voh (min) value (reported by Matthew Blue)

This specific version is at
https://neo900.org/stuff/papers/nfc-draft-20150909.pdf

The source can be found at
https://neo900.org/git/?p=misc;a=tree;f=nfc

- Werner
 

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#14
As Joerg already mentioned, we now also have a description of the
design of the SIM switch:

http://neo900.org/stuff/papers/simsw.pdf

This specific version is at
http://neo900.org/stuff/papers/simsw-20151229.pdf

The source can be found at
https://neo900.org/git/?p=misc;a=tree;f=simsw

This also prompted a few small updates to the NFC draft:

https://neo900.org/stuff/papers/nfc-draft.pdf

Changes:
- add reference to the now released SIM switch document,
- add SWP_nRESET signal,
- renamed SWIO_A/_B (and related signals) to _1/_2, like in the SIM switch document.

- Werner
 

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#15
What is the project at the moment?
Whether there are fresh photos, video?

P.S.: If it is possible, a simple language that the Google Translate translated as much as possible precisely
 

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#16
Originally Posted by VasiliyLiGHT View Post
What is the project at the moment?
Joerg posted a short update a few days ago:
http://talk.maemo.org/showthread.php?p=1492838

One more small item: one of the greater headaches we had were the flash LEDs: we couldn't find any as small as the ones Nokia had used, and all the larger ones would have required major contortion in the design. (Really bad things, like having to move the LEDs to the main PCB and out of the optical axis, then somehow constructing a light guide all the while preventing light leaks. Something we have no experience with. This had "engineering disaster" written all over it.) The good news is that we finally did find a (new, I guess) series of LEDs (LUXEON 3020 series) that have almost perfect characteristics and won't need crazy tweaks.

Whether there are fresh photos, video?
Hmm no, most things we're doing these days are still of the paper-pushing type (whitepapers, component searches, and such).

I just realized that I never made that comparison picture Malakai had asked about. Sorry about that ! Now that I have a few N900 there's no excuse for delaying this. I'll see to it asap.

- Werner
 

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#17
Originally Posted by Malakai View Post
Could we see a picture of both an original n900 and one with the spacer frame (neo900), just to see the difference between them.
Here we go. First, both at an angle:
https://neo900.org/stuff/werner/spac...-10-angled.jpg

Then, "Neo900" with N900 stacked on top:
https://neo900.org/stuff/werner/spac...11-stacked.jpg

And here they are side by side:
https://neo900.org/stuff/werner/spac...er-12-side.jpg

The mechanical assembly is a bit wobbly because I only have short screws and thus could only attach the case parts (barely) at two points, but you probably couldn't tell in the pictures.

I measured the overall thickness with a micrometer (not for precision but to get repeatable pressure), and obtained 17.9 mm for the unmodified N900 and 21.0-21.2 mm for the "Neo900", i.e., the height difference of nominally 3.3 mm is indeed there.

I hope this shows clearly enough how the two compare. And sorry for taking so long !

- Werner
 

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#18
We have just released an update of the Hackerbus white paper, with quite a number of improvements (see below).

Link to the latest version of the document:

http://neo900.org/stuff/papers/hb.pdf

There are several significant changes. The highlights:

- Hackerbus now uses a dedicated USB High-Speed host port, with D+/D- directly accessible on the main Hackerbus connector (replacing two GPIOs). This reduces the risk of upsetting regular USB (OTG) operation.

- Access to USB OTG is still possible, but now uses spring-loaded contacts on the user circuit. This allows the mating contacts in the Neo900 to be simple PCB holes (instead of large header pins), reducing the risk of interference and signal degradation.

- More details on current limits and over-current protection.

- The optional (shared with GPIO) regulated power rail is now 2.7 V instead of 3.3 V. This simplifies the circuit (we already have a 2.7 V rail for various components, but may not have a 3.3 V rail), and most chips that operate with 3.3 V also accept 2.7 V.

- Appendix describing the board-to-board connection between BOB and LOWER. We need to consider this also for the Hackerbus design as it affects the placement of items and each imposes constraints on the other.

This specific version is at
http://neo900.org/stuff/papers/hb-20160211.pdf

The source can be found at
http://neo900.org/git/?p=misc;a=tree;f=hb

As always, comments are welcome.

- Werner
 

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#19
A small but important update of the Hackerbus paper:

http://neo900.org/stuff/papers/hb.pdf

There is only one change (it's all in the appendix, since it doesn't affect Hackerbus itself but the connection to LOWER that is also described in this document):

We moved the flash LED controller from the break-out-board (BOB, the little board with the memory card holder, hanging off the main PCB) to LOWER. The main reason is to make room for the extra signals needed for the privacy LED, which changes from monochrome to RGB in Neo900.

This specific version is at
http://neo900.org/stuff/papers/hb-20160529.pdf

- Werner
 

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#20
We have released an update of the SIM switch document:

http://neo900.org/stuff/papers/simsw.pdf

We have extended counter-surveillance of the modem and related parts of the system by adding current monitoring also for the SIM cards. This is described in section 4.

Furthermore we discuss the physical placement of the card holder for the second SIM card in appendix A.

This specific version is at
http://neo900.org/stuff/papers/simsw-20160614.pdf

- Werner
 

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