Posts made by madscientist

Hello all

I beg your pardon if i took long to reappear, but i spent a long time trying to complete the board design. Even today it's still a work in progress thing, i had to resort to 3 layer autorouting to get it "finished", and i say "finished" because i'm still aware it needs some further development, but now it's a matter of building it.

The problem i have is: ended into a 3 layer pcb, but the goal of this project is to be a single layer bridged by wire linking board, so it can be made using normal electronic tools and not technology from outer space. i could even get the drawings of each layer wich i published into the github repository as svg files.

The problem i need to discuss is: how could 4 layers of wires be turned into a single one cutting the traces that would cross so they can be resolved by wire links?

You can see the svg layers here: https://github.com/temporaryuser132/wakameboard/tree/master/gerbertosvg

This is not a technical questiion, but i need this information looking towards fully set up my account.

I noticed that each account has both an avatar pic and a header pic, what are the sizes in pixels for them?

I'm working on a board based on the A13 chipset. I am trying to finish the connections between the A13 system on chip and the AXP202 power supply IC wich basically controls 4 Buck switching power supplies made of a capacitor and a coil.

The A13 has several VCC and VDD pins, the AXP202 has those 2 voltage outputs.. now for getting them properly mated, how should i connect each one? I have the diagrams of both chips but i'm finding them confusing.

Maybe it's just a matter of using the proper firmware as bootloader, like uboot or some openfirmware like image in the rom chip, then calling the linux os from a usb unit.

A lot of fruit flavoured ones, maybe we could give seafood a try

Hello Everyone.

I'm doing my best to complete this completely open hardware computer project. Basically it is an Allwinner A13 processor working together with an onboard usb hub, an usb to ethernet chip, sound output and input, and super vga output provided by 3 pcm to analog independent converters.

This project could be built should some small issues get resolved, i am publishing actually an Altium 2009 workspace under GNU LGPL licence, so everyone can see it, study it, manufacture it and modify it, keeping changes published in the workspace repository.

The goals i have in mind is to achieve a small but powerful enough computer able to run small gnu/linux desktop distributions in offices, as appliance or machinery controller wherever needed , as multimedia set top box for TV or whatever purpose it may be suitable for.

Those are the reasons i'm looking for volunteers willing to see this project and join into this effort aiming towards a new open computing platform.

The board page is located at: https://www.openhardware.io/view/251/Wakame-Single-Board-ARM-computer#tabs-comments

A website is also available here, you can get the latest files here too:

https://www.openhardware.io/view/251/Wakame-Single-Board-ARM-computer#tabs-comments
Thanks for your attention.

I'm actually having them using the 2 layers. much of the issues seems to come when i first created the components in eaglecad and then i moved all to altium. Please have in mind that i am yet learning how to use Altium properly and i think it has lots of tools for adressing those issues wich i think i'm missing because lack of deeper knowledge.

I am the developer of an arm computer board, whose name is Wakame.

I had develop this board mainly in an Altium 2009 running PC, importing what was an eaglecad project. I have been able to fix much of the problems that this transition meant and now i'm achieving between 85% and 90% of successfull auto routing.

The reason i'm posting this is that , when using the Show Differences tool, between Schematic and PCB i have around 70 small differences, regarding contacts, pins and other little things that are adding up.

My goal with this board is to use a single layer pcb , having all of the parts soldered on the surface, and, whenever traces cross each other, use zero ohm resistors or bridges. I'm about to achieve full autorouting should those 70 details get fixed, but i'm far from being able to resolve the issue of the bridges, because i do not really want to use two layer boards, given that Wakame is just an Allwinner a13 with it's main memory, it's eeprom, an onboard usb hub, an onboard usb to ethernet ic and a special ic intended to convert each of the 6 bit per r,g,b pcm outputs into normal svga output.

Other area i'm in heavy need for advice is the Firmware. I actually wish to have something like OpenFirmware in the eeprom and then get an os like gnu/linux called from a hard drive. In fact, i added two internal usb ports intended for direct attaching both usb hard disk and usb cd/dvd unit so it can boot from them as any desktop computer. I have seen projects like Coreboot, Libreboot, Denx's U-boot, but actually i'd like to have your opinion about wich one to use, and, when making a wakame bootable disk, very likely using mkisofs, wich parameters would best be passed to it for achieving a gnu/linux disk able to boot on this yet to be built machine.

i wish to thanks your support for projects like this one.

you can reach the latest files at:

https://drive.google.com/open?id=0B6khpwdkIiGWM0JtUnpxOGxOa2M

it is an altium 2009 workspace.