I finally sent off my order to seeed and have received the boards back. It turns out, that over the last year (and a half) seeed actually improved their processes and have even narrower minimals, which is great for this board.
Anyway, I took some pics and the uploaded the schematics to . I rather host the schematics etc somewhere on coreboot's servers, as I feel this is as use full to coreboot as anything else.
The only thing I'm not so happy about is the footprint of the FET switch. The legs don't seem to match up perfectly (the outer ones only strangely) and the pads should have been bigger to make soldering easier. But since it is optional (if you bridge s1 and s2 the chip doesn't have to be mounted, nor does RN1 I think, but it's been a while :p)
I haven't split all of the boards yet, but I should have tons! 12 * 8. I am attending FOSDEM2014 so if any of the coreboot folk are having a booth or even just attending, I'd be happy to bring the boards along so they can be gifted. Anybody able to cut them though? I used a stanley knife scorching the board but that took quite some time :) Using a dremel requires extremely steady hands, as the cutting wheel probably does fit, but it's extremely tight.
Anyway, looking forward to show it all off @FOSDEM2014 ;)
Quoted the below to help remind people what this post is really about ;)
On 05/13/12 15:39, Oliver Schinagl wrote:
Just an FYI,
This is the final version that I will send over to seeed after placing an order. The only thing that will change is the order number (now it's an arbitrary number). If I have to do major changes to the board, I will of course send an updated version to the list.
On 04/28/12 16:14, Oliver Schinagl wrote:
Find here all included fixes and modifications. I've increased spacing and removed the 'outline' layer. I moved parts to the edge. Since Seeed does 5x5 boards, I'll assume that those 5x5 is after cutting? Assumption is ...
If I don't see any feedback on things that need fixing here, I'll set out an order for the prototypes :)
Have a good weekend all!
On 04/26/12 18:56, Oliver Schinagl wrote:
Well here it is, the last version which was even harder then the 3rd one. or so it seemed anyhow.
I will work on copying these four to the bottom and renaming the labels before sending them off. I'll post the final pcb on this list again,but routing wise, Nothing will change, unless of course someone found a grand mistake.
So really, all input is greatly appreciated :D would be shameful to send this off to get printed, just to find bugs and have another batch made.
On 23-04-12 20:23, Oliver Schinagl wrote:
I've worked on a rotated version and planning to do two other orientations as well, so early feedback is good, so I don't have to redo them again :)
Silk screening isn't 100% right, since I still need to rename them eventually somehow (edit .pcb file directly is probably the easiest way?)
On 04/20/12 14:50, Oliver Schinagl wrote:
Here's my second attempt at routing the previously mailed png of my schema.
It was a lot trickier to route then my previous version, but I think it worked out!
As mentioned, S1 and S2 need to be shorted if U3 is to be omitted. RN1 should be 10k or ideally 100k, as Peter mentioned earlier.
Hopefully there's no obvious mistakes and can start working on alternative layouts (so it is insert-able in different angles).
DRC Check fails on S1, S2 and U3. It thinks the distance is to shallow. That said, DRC check passes when I set the copper width/distance to 7mil's instead of the current 8 mils.
I'm planning on having these PCB's manufactured by Seeed studio and their minimal width is much smaller.
Minimum trace width: 6mil Minimum trace/vias/pads space : 6mil Minimum silkscreen width : 4mil Minimum silkscreen text size : 32mil
I've used a grid size of 10mil and distances of 8 mils, as I didn't want to rely on the minimum of seed. The silkscreen I positioned using a grid size of 5 mil's however. Not sure what they mean with a 'minimum silkscreen text size' however.
Anyhow, feedback greatly appreciated, so I can start working on alternative layouts :)