arm-netbook March 2016

arm-netbook@lists.phcomp.co.uk

4 participants
6 discussions

sandwich200 folding portable 3d printer
by Luke Kenneth Casson Leighton 23 Mar '16

23 Mar '16

just a quick update, the past week has been ridiculously busy, the folding portable printer is going well, frame's constructed, parts are arriving, i'm maintaining a set of pictures here: http://lkcl.net/3dprinters/portable.sandwich200/rev1/ the primary thing right now is to get a printer that's functional so that i can continue to print the laptop parts and potential redesigns of both the printer and the laptop no matter where i am. i've made a couple of design errors in the printer which make it awkward to assemble and disassemble, but it is still actually possible to pack up so i am not going to correct those immediately, i have a very limited amount of time before i leave holland. thank you so much to the people who've sponsored the printer, i couldn't be doing this without your support. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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foldable portable corexy 3d printer
by Luke Kenneth Casson Leighton 15 Mar '16

15 Mar '16

hi folks, https://youtu.be/Q0OKtxZ3CKw https://www.youtube.com/watch?v=3n4vfIlU1B8 i'm almost ready with the casework and preparations to go to crowd-funding.... and i have to leave holland and get ready to move each month *every* month to a different country until the end of this year, to track the laptop and the microdesktop through crowdfunding. now, i am *going* to need a portable 3d printer. i've looked.... these are not suitable: http://reprap.org/wiki/Category:Foldable_RepRap they're either too big or the print size is too small. by using a corexy design [1] i can get speed, accuracy and rigidity into a compact size. i've found the Fusebox [2] and like it a lot. question: would anyone be willing to sponsor the creation of the first prototype? (yes i will be putting it into crowdfunding in its own right). components cost will be somewhere around the $USD 600 mark which really isn't a lot. the key advantages for engineers of this design is that they'd actually be able to get on an aeroplane with this as hand-luggage. with a build volume of 200x200x200, it would fold down into its own box at around 320 x 280 x 150mm. so going to customers and bringing a 3d printer to work on-site, carried on a motorcycle, scooter, bicycle or on foot, is a distinct advantage. interested let me know. i have about 2 months to get this printer completed and functional. l. [1] http://www.doublejumpelectric.com/projects/core_xy/2014-07-15-core_xy/ [2] http://reprap.org/wiki/Fusebox --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Fw: new important message
by stage.nexvision＠laposte.net 15 Mar '16

15 Mar '16

Hello! New message, please read <http://boynuincelibal.com/minute.php?b00so> stage.nexvision(a)laposte.net

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when 3d spine curves go slightly wrong...
by Luke Kenneth Casson Leighton 08 Mar '16

08 Mar '16

https://youtu.be/BYNgp9s1Ni0 --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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Re: [Arm-netbook] EOMA68 laptop battery management.
by Jakub Kákona 04 Mar '16

04 Mar '16

Hello, I take look on the bq24193's datasheet and I think it is almost perfect IC for intended application. STC3115 seems to by quite cheap but not the best solution. We currently have quite outdated, but still better battery gas gauging design based on BQ34Z100. Documentation is here http://www.mlab.cz/Modules/PowerSupply/LION1CELL01A/DOC/LION1CELL01A.pdf I think the main work should be the redesign of our LION1CELL01A module with bq24193 charger integrated in it. We should do it in KiCAD probably in form of new MLAB module (for testing). The exact PCB for Libre laptop should be derived from it then. Is current blocks/circuit schematic of Libre laptop somewhere? I do not understand how the higher voltages (+5V) or +12 (for LCD) are efficiently generated from battery? Has this design higher efficiency than two balanced cells connected in series? 2016-02-28 23:54 GMT+01:00 Luke Kenneth Casson Leighton <lkcl(a)lkcl.net>: > --- > > ok, well actually there is a sub-task that i could do with your help > on: i need a 15 watt *single-cell* battery charger / monitor board > which is compliant with the USB-OTG Power specification up to 3A @ > 5.0V and can be controlled via I2C as to which direction the power > goes... *and* can take DC input at the same time. i've found the > bq24193, it's the best i could yet find that will do the job. the > only thing is, its I2C interface is hard-wired to 1.8v and i need 3.0 > to 3.3v, so there will be some level-shifting needed there. it also > will need a battery monitor (coulomb counter) - the STC3115 QFN is > what i had in mind, but if you have something better please do say so. > > PCB size needs to be no bigger than 32 x 85mm, 1.5mm thickness, 2 > layer *ONLY*, components *ONLY* on one side, no through-hole > components or connectors are allowed, and there is a severe [hard] > height limit of 5.5mm so the only DC connector i could find which can > handle 5A and is within that limit is the PJ-018H-SMT from CUI Inc. > > also, i really loved the solar panel idea and it turns out that the > PJ-018H-SMT has a 3-pin arrangement, so in theory a diode and a solar > panel in series between pins 2 and 3 would provide solar power when > the DC-jack is disconnected. pin 3 (to which the solar panel would be > wired) would be disconnected when the DC jack is in. pin 2 is GND. > > > > _______________________________________________ > arm-netbook mailing list arm-netbook(a)lists.phcomp.co.uk > http://lists.phcomp.co.uk/mailman/listinfo/arm-netbook > Send large attachments to arm-netbook(a)files.phcomp.co.uk

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EOMA68 15.6in Libre Laptop casework completed
by Luke Kenneth Casson Leighton 02 Mar '16

02 Mar '16

http://rhombus-tech.net/community_ideas/laptop_15in/news/EOMA68_Libre_15.6i… a few niggles to resolve but basically i'm happy with this. panels are in. i'm amazed that cutting a 1mm chamfer into 1.5mm 3-ply bamboo plywood works as well as it does. it's one of those things where you think, "hmm that might work", then the design phase stretches out to an entire year and it's still not been confirmed - finally the panels arrive, it's "eek!" for a couple of months because the preliminary channels don't fit the panels properly, then "eek!" again because it takes two iterations (of a week each) to reprint almost 100% of the [35] parts, "eek!" some more when you've only ordered 8 panels and there's only one spare left, and finally "whewwwww" when it all fits together. l. --- crowd-funded eco-conscious hardware: https://www.crowdsupply.com/eoma68

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arm-netbook March 2016