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#apertus IRC Channel Logs

2014/05/18

Timezone: UTC


01:21
jucar
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03:44
Bertl
off to bed now ... have a good one everyone!
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gcolburn
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06:02
troy_s
intracube: Response on ML.
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12:31
Bertl
morning folks!
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polydaic
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19:02
polydaic
...
19:02
polydaic
hi there!
19:02
polydaic
Bertl: ....
19:03
Bertl
hey
19:10
Bertl
polydaic: what's up, or just happy to see me? :)
19:10
polydaic
lol I'm the guy who emailed you
19:10
polydaic
last week
19:10
polydaic
about helping out with apertus
19:10
Bertl
that limits it to about 500 persons :)
19:11
Bertl
ah, helping out, that limits it further down to a dozen
19:13
polydaic
lol
19:13
polydaic
I'm the EE student?
19:13
polydaic
anyways
19:13
Bertl
excellent, so you want to help with the Beta design?
19:13
polydaic
David
19:13
polydaic
Yea!
19:14
Bertl
good, did you find the time to take a look the the Alpha SFE?
19:14
polydaic
on github?
19:15
polydaic
I've looked through it. Documentation is sparse though
19:15
polydaic
I saw you migrated to github from some other service recently
19:15
Bertl
did we?
19:15
Bertl
what documentation are you looking for?
19:30
polydaic
oh
19:30
polydaic
anyways
19:30
polydaic
What can I help with?
19:31
polydaic
I was seeing if there was any docs with your code on github
19:31
Bertl
depends on what you are willing/able to do
19:31
polydaic
I am willing to do many things lol
19:31
Bertl
the source code is basically the documentation, but I was more referring to the schematic and board layout for the SFE
19:31
polydaic
I'm sure you have things split into tasks? Do you use jira or asana?
19:32
Bertl
no project tracking yet
19:32
polydaic
okok
19:33
Bertl
so, hardware design or software?
19:33
Bertl
(what interests you more)
19:33
polydaic
I would love to work with hardware design, although I'm only 3rd year
19:34
Bertl
okay, comfortable with eagle/kicad?
19:35
polydaic
tbh I've heard of eagle but never used it
19:35
Bertl
so, what do you use for hardware design?
19:37
jucar
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19:38
polydaic
I can probably use eagle
19:39
Bertl
okay, then maybe a good start is to create a few library elements we need?
19:40
polydaic
I've used MultiSim
19:40
polydaic
ok
19:41
polydaic
maybe a good idea to setup something like asana if you have 20 ppl helping?
19:42
Bertl
yeah, once we have more people helping, we'll certainly do something like that
19:42
polydaic
hmm I can also help write documentation and stuff too
19:43
Bertl
that would definitely be great
19:43
Bertl
so where would you like to start then?
19:43
polydaic
Yea. I would love to have the chance to contribute to hardware design, especially as all my jobs are like web development which don't even relate to EE
19:44
Bertl
okay, so, we are currently looking into several connectors for beta
19:44
polydaic
okok
19:44
polydaic
Like MIL grade?
19:44
Bertl
they are all similar, but of course have different land pattern
19:44
polydaic
land pattern?
19:44
Bertl
the footprint on the PCB
19:45
polydaic
okok
19:45
Bertl
i.e. the SMD pads and their placement to solder them on
19:45
polydaic
oh ok
19:45
Bertl
and of course, they have slightly different properties
19:45
polydaic
so like the connectors are the SMD pads?
19:45
Bertl
like pin spacing, shielding, etc
19:45
polydaic
ok
19:46
Bertl
let me give you an example
19:46
Bertl
DF23C-30DS-0.5V
19:47
Bertl
that is a connector from the hirose DF23C series
19:47
polydaic
oh i see
19:47
Bertl
if you google for that, you find a datasheet
19:48
polydaic
yep I found it
19:48
Bertl
on the 3rd page is a Recommended PCB Footprint
19:49
Bertl
similar for the other connector on the 4th page
19:49
polydaic
wait so are these interconnects make the chips removable?
19:50
polydaic
like the ones you get for the microprocessors?
19:50
Bertl
those are connectors between boards
19:50
polydaic
ohhhh
19:50
polydaic
sorry
19:50
Bertl
i.e. they allow to plug a board onto another board
19:50
polydaic
I see I see
19:51
Bertl
to actually use those connectors in our PCB design, those so called land pattern have to be created for a part library which can be used in e.g. eagle
19:51
polydaic
ok
19:51
Bertl
this is rather simple, but still it needs to be done with some care
19:51
Bertl
i.e. get the placement right, the number of pins, find a design symbol, etc
19:52
polydaic
so just cad the schematic?
19:52
Bertl
schematic and the layout part i.e. the footprint
19:53
Bertl
there is an eagle tutorial for doing that and eagle is available for free for Linux/Mac/Win (in a limited version)
19:54
polydaic
https://imgur.com/ORQm0EQ
19:54
polydaic
you mean copy this?
19:56
Bertl
nah, we don't need the 3D/Cad version, we need the schematic/PCB version
19:57
polydaic
ohkk
19:57
Bertl
something like this: http://mightyohm.com/blog/wp-content/uploads/2008/12/ipc-lp-calc.png
19:57
polydaic
yea i understand
19:57
polydaic
so I need to make it for that specific connector?
19:57
polydaic
DF23C-30DS-0.5V
19:57
Bertl
or find it somewhere on the net
19:58
Bertl
it always pays off to do a quick search first
19:58
Bertl
often components have been already created and you only need to adjust minor details if anything at all
19:58
polydaic
yep
19:58
polydaic
but for that specific connector correct?
19:59
Bertl
yes, that would be one we are considering
20:00
Bertl
we are also considering the 40pin version from the same series
20:01
polydaic
ok
20:01
polydaic
Ok. Do you have a google doc of all the tasks needed to be done or just ask on IRC?
20:03
Bertl
for now, just ask here or via email
20:04
polydaic
ok
20:30
polydaic
wait the pcb footprint has different dimensions than the prat
20:30
polydaic
I assume I should use the reccomended pcb footprint one as its a landing pad?
20:35
Bertl
hmm?
20:38
polydaic
land pattern is slightly larger than the actual device correct?
20:41
Bertl
yes, that's correct, i.e. the pads are somewhat larger
20:41
Bertl
because the solder has to go around the pins
20:41
Bertl
but the spacing between pads and pins has to be identical
20:54
polydaic
ok
20:54
polydaic
do you need pin numbers
20:54
polydaic
and i assume top and side view like in that example you linked?
20:55
Bertl
on the PCB we want some kind of orientation marker, i.e. usually pin 1 with a dot, on the schematic we want pin numbers
20:57
Bertl
best to pick an existing connector from the default eagle library and see how it is done there
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00:13
Bertl
off to bed now ... have a good one everyone!
00:40
jucar
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