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#apertus IRC Channel Logs

2014/05/18

Timezone: UTC


00:21
jucar
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02:44
Bertl
off to bed now ... have a good one everyone!
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gcolburn
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troy_s
intracube: Response on ML.
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11:31
Bertl
morning folks!
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polydaic
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18:02
polydaic
...
18:02
polydaic
hi there!
18:02
polydaic
Bertl: ....
18:03
Bertl
hey
18:10
Bertl
polydaic: what's up, or just happy to see me? :)
18:10
polydaic
lol I'm the guy who emailed you
18:10
polydaic
last week
18:10
polydaic
about helping out with apertus
18:10
Bertl
that limits it to about 500 persons :)
18:11
Bertl
ah, helping out, that limits it further down to a dozen
18:13
polydaic
lol
18:13
polydaic
I'm the EE student?
18:13
polydaic
anyways
18:13
Bertl
excellent, so you want to help with the Beta design?
18:13
polydaic
David
18:13
polydaic
Yea!
18:14
Bertl
good, did you find the time to take a look the the Alpha SFE?
18:14
polydaic
on github?
18:15
polydaic
I've looked through it. Documentation is sparse though
18:15
polydaic
I saw you migrated to github from some other service recently
18:15
Bertl
did we?
18:15
Bertl
what documentation are you looking for?
18:30
polydaic
oh
18:30
polydaic
anyways
18:30
polydaic
What can I help with?
18:31
polydaic
I was seeing if there was any docs with your code on github
18:31
Bertl
depends on what you are willing/able to do
18:31
polydaic
I am willing to do many things lol
18:31
Bertl
the source code is basically the documentation, but I was more referring to the schematic and board layout for the SFE
18:31
polydaic
I'm sure you have things split into tasks? Do you use jira or asana?
18:32
Bertl
no project tracking yet
18:32
polydaic
okok
18:33
Bertl
so, hardware design or software?
18:33
Bertl
(what interests you more)
18:33
polydaic
I would love to work with hardware design, although I'm only 3rd year
18:34
Bertl
okay, comfortable with eagle/kicad?
18:35
polydaic
tbh I've heard of eagle but never used it
18:35
Bertl
so, what do you use for hardware design?
18:37
jucar
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18:38
polydaic
I can probably use eagle
18:39
Bertl
okay, then maybe a good start is to create a few library elements we need?
18:40
polydaic
I've used MultiSim
18:40
polydaic
ok
18:41
polydaic
maybe a good idea to setup something like asana if you have 20 ppl helping?
18:42
Bertl
yeah, once we have more people helping, we'll certainly do something like that
18:42
polydaic
hmm I can also help write documentation and stuff too
18:43
Bertl
that would definitely be great
18:43
Bertl
so where would you like to start then?
18:43
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
18:44
Bertl
okay, so, we are currently looking into several connectors for beta
18:44
polydaic
okok
18:44
polydaic
Like MIL grade?
18:44
Bertl
they are all similar, but of course have different land pattern
18:44
polydaic
land pattern?
18:44
Bertl
the footprint on the PCB
18:45
polydaic
okok
18:45
Bertl
i.e. the SMD pads and their placement to solder them on
18:45
polydaic
oh ok
18:45
Bertl
and of course, they have slightly different properties
18:45
polydaic
so like the connectors are the SMD pads?
18:45
Bertl
like pin spacing, shielding, etc
18:45
polydaic
ok
18:46
Bertl
let me give you an example
18:46
Bertl
DF23C-30DS-0.5V
18:47
Bertl
that is a connector from the hirose DF23C series
18:47
polydaic
oh i see
18:47
Bertl
if you google for that, you find a datasheet
18:48
polydaic
yep I found it
18:48
Bertl
on the 3rd page is a Recommended PCB Footprint
18:49
Bertl
similar for the other connector on the 4th page
18:49
polydaic
wait so are these interconnects make the chips removable?
18:50
polydaic
like the ones you get for the microprocessors?
18:50
Bertl
those are connectors between boards
18:50
polydaic
ohhhh
18:50
polydaic
sorry
18:50
Bertl
i.e. they allow to plug a board onto another board
18:50
polydaic
I see I see
18:51
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
18:51
polydaic
ok
18:51
Bertl
this is rather simple, but still it needs to be done with some care
18:51
Bertl
i.e. get the placement right, the number of pins, find a design symbol, etc
18:52
polydaic
so just cad the schematic?
18:52
Bertl
schematic and the layout part i.e. the footprint
18:53
Bertl
there is an eagle tutorial for doing that and eagle is available for free for Linux/Mac/Win (in a limited version)
18:54
polydaic
https://imgur.com/ORQm0EQ
18:54
polydaic
you mean copy this?
18:56
Bertl
nah, we don't need the 3D/Cad version, we need the schematic/PCB version
18:57
polydaic
ohkk
18:57
Bertl
something like this: http://mightyohm.com/blog/wp-content/uploads/2008/12/ipc-lp-calc.png
18:57
polydaic
yea i understand
18:57
polydaic
so I need to make it for that specific connector?
18:57
polydaic
DF23C-30DS-0.5V
18:57
Bertl
or find it somewhere on the net
18:58
Bertl
it always pays off to do a quick search first
18:58
Bertl
often components have been already created and you only need to adjust minor details if anything at all
18:58
polydaic
yep
18:58
polydaic
but for that specific connector correct?
18:59
Bertl
yes, that would be one we are considering
19:00
Bertl
we are also considering the 40pin version from the same series
19:01
polydaic
ok
19:01
polydaic
Ok. Do you have a google doc of all the tasks needed to be done or just ask on IRC?
19:03
Bertl
for now, just ask here or via email
19:04
polydaic
ok
19:30
polydaic
wait the pcb footprint has different dimensions than the prat
19:30
polydaic
I assume I should use the reccomended pcb footprint one as its a landing pad?
19:35
Bertl
hmm?
19:38
polydaic
land pattern is slightly larger than the actual device correct?
19:41
Bertl
yes, that's correct, i.e. the pads are somewhat larger
19:41
Bertl
because the solder has to go around the pins
19:41
Bertl
but the spacing between pads and pins has to be identical
19:54
polydaic
ok
19:54
polydaic
do you need pin numbers
19:54
polydaic
and i assume top and side view like in that example you linked?
19:55
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
19:57
Bertl
best to pick an existing connector from the default eagle library and see how it is done there
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23:13
Bertl
off to bed now ... have a good one everyone!
23:40
jucar
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