| xiangfu | how can I count the vias in KiCAD? | 08:13 |
|---|---|---|
| wpwrak | xiangfu: in pcbnew, File > Fabrication Outputs > Drill (.drl) File. The dialog that comes up has the number of vias. (Then just cancel.) | 11:48 |
| wpwrak | hmm, does IRC have a "send when user returns" feature ? would seem useful when communicating with those who are not "always on", particularly when timeshifted | 11:50 |
| viric | nickserv has a mailbox | 11:51 |
| viric | when the nick identifies, gets notified of messages there | 11:51 |
| viric | hm maybe it's not nickserv, but another freenode bot | 11:52 |
| larsc | wpwrak: that's called email ;) | 11:53 |
| wpwrak | bah, that's so pre-social media | 11:53 |
| viric | wpwrak: it's memoserv. /msg memoserv help | 11:54 |
| larsc | wpwrak: twitter should work fine as well | 11:54 |
| wpwrak | viric: thanks ! let's see if it works :) | 11:55 |
| viric | memoserv is both the past and the future! | 11:56 |
| wpwrak | larsc: hmm, or maybe open a linkedin account, invite the recipient, and let linkedin flood him with nag mails | 11:56 |
| wpwrak | viric: so you say xiangfu will have read the message i just sent now before he left some time ago ? | 11:56 |
| viric | eh? | 11:57 |
| viric | I can't decode your message | 11:58 |
| larsc | timetravel | 11:59 |
| wpwrak | that was a reference to the past. ... yup :) | 11:59 |
| wpwrak | send message now, memoserv delivers it before it was sent. | 11:59 |
| wpwrak | viric: kewl, works :) | 12:00 |
| viric | amazing technology | 12:04 |
| wpwrak | these fancy new "electronic brains" are quite something, eh ? maybe one day, they'll even play chess | 12:10 |
| qi-bot | [commit] Werner Almesberger: poke/: move over from svn.openmoko.org/developers/werner/poke/ (master) http://qi-hw.com/p/wernermisc/355614b | 12:11 |
| paul_boddie | Oh dear: http://www.bbc.co.uk/news/technology-20219292 ("Imagination challenges ARM with Mips takeover") | 13:23 |
| wpwrak | that may be good. other soc makers may be unwilling to license powervr if imagination are competing in the soc market. | 13:31 |
| paul_boddie | Knowing Imagination and their highly proprietary PowerVR stuff, this probably means that they want MIPS vendors to saddle their products with it. | 13:32 |
| wpwrak | xiangfu: you may have news from MemoServ ;-) | 13:32 |
| paul_boddie | Obviously Intel, AMD and ARM have dumped Imagination, so they're effectively a patent troll in waiting. | 13:32 |
| wpwrak | if you see a patent, the trolls usually aren't far ... | 13:33 |
| paul_boddie | Actually, AMD probably never used them, but now that AMD will also produce ARM-based products, it's almost reassuring that ARM seem to have dumped PowerVR. Then again, ARM aren't completely trustworthy. | 13:35 |
| wpwrak | from what i've heard, mali is somewhat open. not sure if that's thanks to ARM or thanks to good reverse engineers, though. | 13:37 |
| xiangfu | wpwrak, [File > Fabrication Outputs > Drill (.drl) File.] thanks. I got 577 vias. | 13:40 |
| xiangfu | wpwrak, how do I know if them are blind vias or buried vias? | 13:41 |
| xiangfu | wpwrak, do you remember, once you talking about 'azonenberg' fpga PCB board. that something is not easy for command pcb fab? | 13:43 |
| xiangfu | something on azonenberg's board. | 13:43 |
| xiangfu | I have 2 azonenberg board kicad files here. one is 'minimal-spartan6-tq144 2 layers board', another one is xc6slx9 ftg256 4 layers board. | 13:44 |
| paul_boddie | What was the word on OpenRISC, by the way? I may go to a talk about that soon, and it'd be interesting to hear what people think of it in advance. | 13:49 |
| wpwrak | xiangfu: in general, you should try to avoid fancy vias. the best are through vias. then blind. buried are worst. | 13:54 |
| wpwrak | xiangfu: kicad doesn't seem to distinguish blind and buried in its statistics | 13:55 |
| xiangfu | wpwrak, ok. got it. I saw those fancy vias cost more money in PCB fab. :-) | 13:56 |
| wpwrak | xiangfu: azonenberg designs his boards to the capabilities of his pcb house. so you have to be a bit careful with his designs. they may be more demanding than necessary for a given design. | 13:57 |
| wpwrak | fancy vias also restrict your choice of fabs. and they're harder to debug if anything goes wrong. | 13:57 |
| wpwrak | s/for a given design/for a given circuit/ | 13:58 |
| xiangfu | wpwrak, what is the special design? | 13:59 |
| wpwrak | what i mean is that he does some things in ways that complicate producing a board. that may include difficult via types or very narrow mechanical tolerances. | 14:02 |
| Action: paul_boddie is looking at http://opencores.org/or1k/Ordb2a-ep4ce22 | 14:02 | |
| xiangfu | wpwrak, also there is a 'Impedance Control' like 10% or 5%. is that very important for 4 layer board? | 14:03 |
| wpwrak | i do the other extreme :) my boards are generally meant for DIY, so all vias are very simple, there's a lot of mechanical tolerance, etc. | 14:03 |
| wpwrak | depends on whether you have signals that need to be impedance matched :) | 14:03 |
| wpwrak | things like RF or other high-speed signals | 14:04 |
| xiangfu | wpwrak, (impedance matched) ok. what is the Impedance control on m1 board? do you know that? | 14:05 |
| wpwrak | not sure if any impedance constraints were specified for M1. most of the signals there are slow. you'd have to ask adam. | 14:06 |
| xiangfu | ok. then I think I also don't need that at all. :-) | 14:06 |
| wpwrak | with your little FPGA board ? no, i hope not ;-) | 14:07 |
| xiangfu | wpwrak, last question. how do I know the 'Min Annular Ring' on KiCAD? | 14:07 |
| xiangfu | every vias cost money. :( | 14:07 |
| xiangfu | about the Thickness (Finished Board), most common 2 or 4 layer board is 1.6mm. right? | 14:09 |
| xiangfu | some RF board may need 0.8 or 1mm PCB board. | 14:09 |
| wpwrak | (annular ring) that's a question from your pcb fab ? it would be either the outer diameter of vias or the difference between inner and outer diameter. not sure which. | 14:09 |
| wpwrak | 1.6 mm is very common, yes. for small boards, you can also pick thinner pcbs. but 1.6 mm is a good default choice. | 14:10 |
| xiangfu | wpwrak, this is the board full detail asked by PCB fab: http://pastebin.com/BNPK0vXu | 14:10 |
| wpwrak | they could get some of the parameters simply by processing your files ... | 14:13 |
| wpwrak | i guess they're lazy :) | 14:13 |
| xiangfu | yes. good thing is I learned something on those questions. :-) | 14:14 |
| xiangfu | also for calculate the order price before I send the Gerber files | 14:16 |
| Action: paul_boddie notes fairly recent slides, video, audio about OpenRISC at http://opencores.org/or1k/OpenRISC_Project_Meeting | 14:17 | |
| wpwrak | your vias seem a bit odd. the drill is quite large (0.3 mm / 12 mil) but the ring is narrow (only 0.1 mm) | 14:18 |
| wpwrak | i would make the hole a bit smaller (e.g., 0.25 mm / 10 mil). maybe also grow the ring a bit, in case you want to make DIY board from these parameters. | 14:19 |
| xiangfu | hmm... | 14:28 |
| xiangfu | in kicad. the Via shows: Diam: 0.551mm, Drill 0.330mm. | 14:28 |
| xiangfu | is that means ring is 0.22mm | 14:29 |
| xiangfu | 0.221mm | 14:29 |
| wpwrak | 0.22m / 2 for the ring width | 14:31 |
| xiangfu | oh. yes. 0.22 / 2 | 14:31 |
| xiangfu | thanks wpwrak. I think I understand all those PCB Specification now. :) | 14:38 |
| wpwrak | kewl :) good luck with the board ! | 14:40 |
| qi-bot | [commit] Werner Almesberger: ioscript/: script-based toggling of IO pins (for device testing) (master) http://qi-hw.com/p/ben-blinkenlights/025726e | 15:06 |
| wpwrak | cool. i made a line with led so bright that i still have afterimages about a minute after looking at them ;-) | 16:33 |
| larsc | not cool... | 16:46 |
| larsc | ;) | 16:46 |
| wpwrak | and was only at about a third of the maximum brightness :) | 16:57 |
| whitequark | wpwrak: it should be quite hot actually | 20:04 |
| wpwrak | the board gets a little warm indeed | 20:06 |
| whitequark | as per afterimages | 20:07 |
| whitequark | once I tried to make a photo of myself with my smartphone | 20:07 |
| whitequark | and due to lightning conditions in the room, I had to do it with flash | 20:07 |
| whitequark | well | 20:07 |
| whitequark | it was quite literally painful | 20:07 |
| whitequark | and I wasn't able to open my eyes for at least 30 seconds after clicking the button | 20:08 |
| whitequark | I think that flash can be used as a weapon | 20:08 |
| whitequark | you can lit up a medium-sized room with it well enough to comfortably read 12-15pt text | 20:09 |
| whitequark | *light | 20:09 |
| viric | are LED flash common? | 20:12 |
| whitequark | viric: almost any modern smartphone has one | 20:13 |
| whitequark | through not every one of these is as powerful of mine | 20:13 |
| viric | ok | 20:13 |
| whitequark | I think that samsung went a bit overboard | 20:13 |
| viric | do they use high voltage? | 20:13 |
| whitequark | fsvo high | 20:13 |
| whitequark | I think that the led is actually a compound one, with 4 or maybe 6-8 dies | 20:13 |
| whitequark | from what I know about bright LEDs | 20:14 |
| whitequark | they're connected sequentally, hence you'd need voltages in range of 10-20V to power it | 20:14 |
| --- Wed Nov 7 2012 | 00:00 | |
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