arm-netbook

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1079 discussions

Standardized Battery Pack Sizes?
by Alexander Ross 27 Sep '17

27 Sep '17

One of the things ive been doing lately is diy battery boxes to power my gear (sound systems and lights). I see there’s a lack of cheap standard dimensioned battery packs. theres only popular proprietary ones. Sony camera/lighting li-ion 2S packs or drill packs, RC lipo packs but not in a hard case. this all end up being quite expensive compared to raw li-ion cells + BMS. With gadgets there seams to also be a problem. handheld computers like prya,zipit,eoma68 laptop[1],gpd pocket,etc use custom lipo cells which are very difficult to get replacements of because there not common but custom sizes. [1] luke, the eoma68 laptop li-ion cell is a non typical right? i know its a ebike battery cell but i assume theres no typical ebike li-ion cell dimensions? Why can’t we start cheap standard dimensions battery packs? I guess mass produced of the shelf is needed but what current company is going to start that? We have standard dimensions lithium cell sizes like the classic 18650 but devices want flat slim lipos :/. For large packs they need to be carefully balanced cells particularly when in parallel. So having mass produced battery boxes that users replace the cells in when the old cells die, i guess is not much good due to the unknowns in how much the cells match each other? Are there other solutions? Could we have enthusiast packs that are just in series with just 18650s in series for more Wh? upto hmm 6S? and for larger mah switch to more expensive 26650? would this be a in our power solution? would just diy people adapt it? or could products adapt it too? oww there is AA sized lithium cells too: 14500 maybe they could fit into designs of our little gadgets instead of flat lipo cells? if we really need small flat lipo cells, what would it take for a set of standard dimensions? What about large say 5Ah-20Ah sized cells and getting standardized battery packs? for all those large portable speakers or portable solar pods/battery power supply box products and ebikes,etc. Currently some use lead acid retro fit lithium packs but with balancing done internally by the bms, but how acceptingly is that?

4 7

Flash Debian and U-Boot to a PocketChip?
by Gpast_panama 22 Sep '17

22 Sep '17

Perhaps this is better suited to a reply than a new topic, but I'm not aware of how to do that with messages in digest mode so... Back in July, Pablo claimed at http://lists.phcomp.co.uk/pipermail/arm-netbook/2017-July/014340.html that he had successfully managed to get Debian Stretch running from USB on the PocketChip. Could somebody explain to a novice (i.e. me) what the steps entailed to flash u-boot and then boot Stretch are? A description of how to flash the OS to NAND would be amazing, but even just a brief outline of Pablo's process would be great. Thanks (and sorry for my ignorance)! Regards, Grace Past

3 2

riki200 v3 first print: success
by Luke Kenneth Casson Leighton 21 Sep '17

21 Sep '17

http://forums.reprap.org/read.php?177,767087,787441#msg-787441 yay!

7 21

libre board ?
by mdn 19 Sep '17

19 Sep '17

Hello, People shared this to me what do you think about it ? https://www.kickstarter.com/projects/librecomputer/libre-computer-board-nex… Has long has it's not RYF the "libre" wording creates some doubts in my mind. Have a nice day. -- Librement BERNARD ENG: Please be kind enough to use GPG for our future conversations: https://emailselfdefense.fsf.org/en/ If this email isn't PGP signed then it isn't mine. -If you can't compile it dump it.

1 0

Feedback?
by Richard Wilbur 18 Sep '17

18 Sep '17

Luke, How are things going? Congratulations on a successful surface-mount board soldering trial of the JAE micro HDMI connector! I sent my latest recommendations regarding the high-frequency HDMI layout on 1 Sep. I was looking forward to some feedback with respect to some of the questions and suggestions I raised there. 1. Did you receive the message (it referred to 4 images you attached to a previous post)? 2. Does it need pictures showing what I'm talking about? 3. Please let me know if something doesn't make any sense so I can try to explain it better--so it does make sense. It is very possible that some of the things I recommended can't be done on this layout. That's okay. Let me know and I can see if there is another technique we can use to achieve the same goal or dismiss it as not necessary for a working system. Sincerely, Richard

2 4

Conflict-free minerals
by Jean Flamelle 18 Sep '17

18 Sep '17

I just thought I'd make a poke about this. Been a bit busy lately to contribute to the liberating chip or the standards thread, but will be getting back on those soon. No one has really mentioned conflict-free minerals, or does so often in the libre community. It's kinda like adding just one other complication to an already mess-y problem, but I'm interested to know more about the details and problems involved with paying attention to the actual mineral sourcing. I can imagine many OEM's don't publish or even pay attention to where they get minerals from, so I imagine the potential parts list dwindles beyond reason at simply limiting one's self to OEM's that at least list their mineral sources, much less then actually trying to them limit it based on the fairly subjective "conflict-free" qualification.

6 8

Retrfit a Nokia and KiCad fun
by mike.valk＠gmail.com 16 Sep '17

16 Sep '17

https://hackaday.com/2017/09/12/hackaday-prize-entry-retrofit-a-nokia/ https://hackaday.io/project/21263-nokia-3210-retro-fit-board Quote from the project log: "With the patched I submitted you can turn KiCad into a 'I know what I am doing' mode. Which meas you can place any type of via anywhere. You should not do it though. Vias are pretty well constraint by the manufacturer of the board. Since KiCad does not know of any layer thickness, production technologies and such it restricts to what is a sensible lowest common denominator." Hmm so KiCad does not have a "PCB manufacturer constraints" input? How handy... NOT

5 5

ppcnotebook
by ronwirring＠Safe-mail.net 14 Sep '17

14 Sep '17

https://www.powerpc-notebook.org/en/ Do you know them? Are they credible? Thank you.

8 13

pre-2.7.5 JAE DC3 micro-hdmi connector test PCB success
by Luke Kenneth Casson Leighton 13 Sep '17

13 Sep '17

http://rhombus-tech.net/allwinner_a10/news/ --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

5 6

Part sourcing
by mike.valk＠gmail.com 11 Sep '17

11 Sep '17

http://www.findchips.com/ We'll that's interesting. Doesn't beat the offline markets in Shenzhen I guess.

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