arm-netbook September 2015

arm-netbook@lists.phcomp.co.uk

14 participants
14 discussions

Open sourced A13 Kicad design mail server
by joem 18 Oct '15

18 Oct '15

Open sourced A13 Kicad design mail server https://www.own-mailbox.com/libre.html Found them on kickstarter: https://www.kickstarter.com/projects/1547898916/own-mailbox-the-first-100-c… Seems these guys have done some real hard work. As well release their design on KiCAD, they also made a distro that runs on A13 which has a modified mail server that accepts mail replies and posts it at secure https links to standard email addresses which don't offer security built in. The KiCAD designs are missing some libs due to the way the paths have been hard coded into the project files. I'm sure they will get around to repairing it. Its a more powerful design than a raspberry pi, but many times smaller.

3 7

How much to design A20 board?
by joem 30 Sep '15

30 Sep '15

Hi, Just wondering how much is it these days ball park to pay someone like witstech or a similar design outfit to design an A20 board (like a cubie) and make 10 samples?

5 22

Handheld Games Console
by GaCuest 29 Sep '15

29 Sep '15

Hello everyone. Now I am going to talk about handheld games console based on EOMA-68. As I mentioned in other posts, we have finally changed some things. For example, we have made the interchangeable screen. It will be available 3 models (without display, cheaper; with 480p display; and with 720p display, more expensive). Furthermore, more advanced users can change the display. Moreover, we will design the console in 3 PCB. On one hand, the central PCB (first PCB) where all components except the controls are, and the second and third PCB where the controls are. This allows us to design the 1st PCB first, and then design the case around the 1st PCB and decide where to place the controls. After, we design the second and third PCB. You can see this concept here: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Now I put the block diagram of all PCB. Block diagram of the first PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Datasheet of components of first PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Block diagram of the second PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Datasheet of components of second PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Block diagram of the third PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Datasheet of components of third PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Block diagram of the 480p display PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Datasheet of components of 480p display PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Block diagram of the 720p display PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Datasheet of components of 720p display PCB: http://george.the-petries.co.uk/shared-write-access/eoma/HandheldGamesConso… Any help/change/suggestion is welcome.

5 29

laptop 15in pcb1 progress
by Luke Kenneth Casson Leighton 29 Sep '15

29 Sep '15

http://rhombus-tech.net/community_ideas/laptop_15in/news/ CM108AH, and Power ICs, all functional. l.

3 11

Interchangeable screen
by GaCuest 21 Sep '15

21 Sep '15

Well, we are designing a handheld games console based on EOMA-68. We have thought about doing an interchangeable screen. Users can buy the handheld games console without a display (more cheaper, users can use the HDMI of EOMA-68), with a 480p display or 720p display (more expensive) and upgrade it in a future. We would connect the TFT and touch screen connector on a PCB, and user may connect it with a connector to the base PCB. We have thought about use neodymium magnet (some of 2x1 mm of them) to connect the case of the display+touch panel with the case of handheld games console. But we have some doubts about how to connect both PCB. We've thought use a slim B2B connector like this: http://www.literature.molex.com/SQLImages/kelmscott/Molex/PDF_Images/987651… The problem is that slim B2B connector have slow mating cycles (about 30-50 times). Any can help us about a better way to connect it? Thanks.

5 18

Documentary: Consumed - Is Our Consumer Culture Leading to Disaster?
by Alexander Stephen Thomas Ross 18 Sep '15

18 Sep '15

https://www.youtube.com/watch?v=bOKl04TWVsU talks mainly about the people/human side of being consumed.

2 1

libre laptop 15in PCB 1 and 2 arrive
by Luke Kenneth Casson Leighton 17 Sep '15

17 Sep '15

http://rhombus-tech.net/community_ideas/laptop_15in/news/ okaaay! so the main and the EC pcbs arrived from eurocircuits, they're all silver because they're prototype-ready, covered entirely in solder, no markings or masks at all. i experimented with the USB connectors, and the results can be seen above. heating up the boards took longer than i expected (even with an 800 watt ceramic bed and a 200 watt overhead lamp) but it got there in the end, the solder melted happily on the pins of the USB connector and we're good. i can do this :) l.

1 0

Plug computer and FreedomBox-related devices
by Paul Boddie 17 Sep '15

17 Sep '15

Hello, So I was browsing the FreedomBox mailing list when I saw a mention of a plug computer being crowdfunded: http://lists.alioth.debian.org/pipermail/freedombox-discuss/2015- September/006879.html Here's the actual crowdfunding page: https://www.kickstarter.com/projects/1547898916/own-mailbox-the-first-100- confidential-mailbox And the home page of the device: https://www.own-mailbox.com/ So, it seems that the initiators of the campaign have made their own Allwinner A13 board with 256MB RAM and Ethernet support. It is open hardware, apparently, and the software is Free Software, not some kind of proprietary "snake oil" that some privacy campaigns tend to foist on their supporters. It is a bit odd that they've decided to go their own way with the hardware, though. The FreedomBox recommends existing hardware rather than focusing on one particular device: https://wiki.debian.org/FreedomBox/Hardware Another initiative just uses one of the Olimex A20-based products: http://internetcu.be/ Where the product in question looks a lot more capable than the one attempting to be funded above: https://www.olimex.com/Products/OLinuXino/A20/A20-OLinuXino-LIME/open-sourc… hardware Anyway, back to EOMA-68, and a quick search produced a page on the plug computer idea for EOMA-68: http://rhombus-tech.net/community_ideas/plug_computer/ It occurred to me that if only we had EOMA-68 boards out there, maybe people wouldn't be so enthusiastic to go to the trouble of making new boards and running the gauntlet of crowdfunding. There also wouldn't be the artificiality of "stretch goals" where things that should just be happening anyway are punted off into an uncertain future, dependent on the delivery of something that should be separate. Paul

5 13

libre laptop power board, needs 2oz copper, any recommendations?
by Luke Kenneth Casson Leighton 13 Sep '15

13 Sep '15

ok, i checked with the eurocircuits online system, they can't handle the power board. the LTC4155 is handling 4 amps, so the app note says that 2oz copper is needed. however, eurocircuits require a minimum track-to-track clearance of 10mil which is totally incompatible with the distance even between pads of the LTC4155 IC! therefore we conclude, simply, that eurocircuits doesn't have good enough equipment, therefore it is necessary to find an alternative PCB prototyping company. i've managed to get the track-to-track distance to 7mil, smallest via is 10mil with a 24mil ring, track width is a minimum of 8mil, and the size of the PCB is tiny: 3.4in x 1.2in. it's only two layer, components only on one side, but the copper needs to be 2oz. can anyone help with PCB manufacturing at all? tia, l.

3 2

libre laptop 15in pcb progress
by Luke Kenneth Casson Leighton 10 Sep '15

10 Sep '15

eurocircuits report "accepted" after manufacturing the main and the EC PCB prototypes.... they're only 1/2oz copper, literally bare copper, and for $EUR 100 including shipping 2 of each i am really happy with that. components arrived from digikey for the main PCB as well, i can start burning my eyes and singeing my hair some time next week :) l.

1 0

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arm-netbook September 2015