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1079 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

linus torvalds says "2016 is the year of the arm laptop"
by Luke Kenneth Casson Leighton 15 Oct '15

15 Oct '15

http://linux.slashdot.org/story/15/10/09/1838249/linus-2016-will-be-the-yea… surpriiiise!

3 12

laptop_15in working PCB2!
by Luke Kenneth Casson Leighton 05 Oct '15

05 Oct '15

yippee, i tested the PCB2 i put together yesterday, and successfully uploaded a test program to it, turning it into an example USB-HID "mouse" that generates events, wobbling the cursor back and forwards. over the past few days i found someone who coincidentally maintains a branch with USB support for the exact STM32F model ARM Cortex M0 that i chose, and i got a working "usb hid" example up and running on a demo board i have, here ($EUR 10 retail. amazing). yesterday i populated PCB2 with components, i had got the STM32F072 the wrong way round, burned one out! used the IR solderer to remove it and stuck a new one down, this time the right way round :) then, with a lot of fiddling i managed to get the right connections to reset and put it into "DFU" - device firmware upload - mode. then i just uploaded the firmware tested previously on the demo board, and yay it worked. so i will do a bit more firmware programming, there is the keyboard matrix to do, I2C interface for the touchpanel (converting to real USB-HID events), and also there is the SPI interface for the 480x320 LCD. testing the LCD and capacitive panel for the first time will be interesting. l.

1 1

laptop and microdesktop pcbs
by Luke Kenneth Casson Leighton 03 Oct '15

03 Oct '15

ok so: after finding that there's someone who is maintaining an STM32F072 USB branch, and testing it successfully to create both a usb-hid and usb-cdcacm example i put the majority of the components on the laptop STM32F072 PCB, with the exception of the 3.3v regulator which isn't here yet. i have a source of 3.3v power so that can be tested later. assembly of the much smaller STM32F072 PCB was only a day, with two uses of the IRDA lamp. i did however have to go round all of the 0.5mm pitch QFP and FFC pins individually with a soldering iron. surprisingly, QFNs tend to stick first time. i've also ordered the laptop PCB3 which is the power board, that one is going to be fun and games, especially with the EMF from the rather large (4A) regulator. i've put in a huge number of GND vias surrounding the high-frequency power output which goes to the inductor, we'll just have to see what happens. also i had redesigned the microdesktop board some weeks back, and will be de-populating one of the existing boards and transferring all the components. this i anticipate to be pretty straightforward, although perplexingly the microdesktop board has a staggering 120 components. i don't quite understand why, given that it's 4in x 3.5in and that the CPU Card itself is around 3.5in x 2in! still, there we go... :) l.

1 0

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.

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