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<rjeffries>
wpwrak I look forward to learning if the datasheet comes anywhere close to meeting your standards. I have not read the whole thing, I thought the SPI, I2C and UART parts looked pretty good
<wpwrak>
i had a quick look at it. it does look useful for programming. not sure it it contains all the information you need (sometimes you only find out something crucial is missing when you actually try to do something), but it looks quite promising
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<kristianpaul>
afaik and i guess as spected i dont read too much info about video
<wolfspraul>
abbreviated datasheet :-)
<kristianpaul>
indeed !
<wolfspraul>
hey, at Milkymist we have the entire source of the entire chip
<wolfspraul>
how about that :-)
<kristianpaul>
hard to beat :)
<wolfspraul>
but I do like the Pi project, nonetheless. I just hope they push our real boards and keep them cheap and shuffle a lot of great software on their boards. power to people...
<wolfspraul>
push out
<kristianpaul>
I _just_ like the price, but i hold my hopes, but smell another OLPC-like "cheap" computer project
<kristianpaul>
we'll see
<kristianpaul>
may be not
<wolfspraul>
I had another question about DocScrutinizer's idea a while back with the aluminum stripes on the bottom side of the Milkymist One PCB...
<wolfspraul>
unfortunately he may be sleeping already and mine and his timezones don't overlap well now, urgh ;-)
<kristianpaul>
haha
<wolfspraul>
question was about whether it had to be aluminum, or what the difference to a copper strip would be
<wolfspraul>
also the width, whether thicker would do as well
<wolfspraul>
and finally whether it would matter if the glue was conductive as well
<kristianpaul>
the X shaped aluminum thing? or was that tape?
<kristianpaul>
soem kind of tape*
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<wolfspraul>
I just looked a hundreds of different conductive tapes recently and got a little shock that I had no clue which one might actually follow Joerg's idea :-)
<kristianpaul>
ah :-)
<wolfspraul>
yes, tape
<wolfspraul>
a big X on the bottom side of the pcb so we can remove the metal shield and still achieve the same EMI effect
<wolfspraul>
no, sorry. ESD
<wolfspraul>
so the questions are: wider ok? 1cm, 2cm? copper? conductive glue?
<wolfspraul>
kristianpaul: well, I personally wouldn't spend time on the Pi project because I think Milkymist is so much better, cooler, more interesting and promising
<wolfspraul>
but the great thing about Pi (*if* they make it there which they have not yet), is that it may offer cheap boards today
<kristianpaul>
oh no me either
<wolfspraul>
emphasis on *today*
<wolfspraul>
it's about speed and price
<kristianpaul>
as i had said, price is one thing call me atention for running a cheap webserver
<wolfspraul>
so it may be able to solve some problems today that Milkymist in all its coolness and promise cannot solve today
<rjeffries>
wolfspraul I understand totally. a differnt view is that a decent platform for $50USD that runs Linux can be used by many people ho can not afford MM and also it is arguably a more general computer platform
<kristianpaul>
tought i can do that with milkymist, just no plans to order one 499usd webserve yet ;-)
<kristianpaul>
but i was trying rtems httpd other time
<kristianpaul>
was quite nice for my requiremns of running html plain webpages ;D
<kristianpaul>
s/requiremns/requirements
<qi-bot>
kristianpaul meant: "was quite nice for my requirements of running html plain webpages ;D"
<rjeffries>
one supposedly can order Raspberry Pi for delivery early March
<wolfspraul>
we get the price down, but not now and not to catch up/compete with Broadcom, but instead to just make Milkymist more attractive and affordable for more people...
<kristianpaul>
yes sure thats cool
<rjeffries>
these two things do not compete
<rjeffries>
one sells in qty of 100's the other will be in qty of 10K and far greater
<kristianpaul>
ethernet have its potencial, also *theorically* fpga acelerated webserver etc
<rjeffries>
may 1,000 flowers bloom
<rjeffries>
nobody has to buy one or the other.
<kristianpaul>
actually i had read some interest of moving fpga's to the servers fields.
<kristianpaul>
may be roh now more about it?
<kristianpaul>
anway.. lets try be usefull for 2 hrs :-)
* kristianpaul
away of irssi
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<wpwrak>
i think making the X wide doesn't matter
<wpwrak>
conducting glue sounds dangerous, though. you don't want to short contacts/components at the bottom of the pcb
<wpwrak>
also, copper should be even better than Al. probably also more expensive
<wolfspraul>
hmm
<wolfspraul>
there are quite a few parts on the bottom side
<wolfspraul>
so we cannot rely on just hoping that the glue will insulate 'enough'
<wolfspraul>
the conductive properties of the glue are quite important then
<wolfspraul>
say if you push the strip down, you may push the metal layer against the parts...
<wpwrak>
yup. that's probably something that needs considering
<wpwrak>
unless the tape has its own fairly solid isolating layer
<wolfspraul>
well, when I saw those hundreds of tapes I knew I didn't know enough for sure ;-)
<wolfspraul>
oh I bet that exists, we just need to be clear
<wpwrak>
;-))
<wolfspraul>
so maybe we need a 3-layer tape, first copper or aluminum, the insulation, then glue
<wolfspraul>
or a glue that is *really* insulating, even when the tape is glued over and pushed down onto small and sharp smd parts
<wpwrak>
hmm ...
<wolfspraul>
yeah
<wolfspraul>
doesn't sound very convincing ;-)
<wolfspraul>
3-layer probably...
<wolfspraul>
the tape has to have some insulation already
<wpwrak>
most tapes have some sort of foam at the bottom. so that foam would have to be thicker than the tallest elevation
<wpwrak>
plus, when you compress it, e.g., when putting the tape, it must extend again
<wolfspraul>
you mean it must be impossible for any part to protrude through the foam?
<wpwrak>
and that's not even talking about compressing it with the case off ;-)
<wpwrak>
yup
<wolfspraul>
like I said, it sounds like we need a strong insulation layer under the copper/aluminum
<wolfspraul>
just hoping the glue is enough won't do
<wpwrak>
yes, that sounds good
<wpwrak>
if you can't find that, maybe some separate isolating sheet and then the conductive tape on top
<wolfspraul>
I'm sure we are not the first ones with this requirement, so it comes down to finding the right tape
<wolfspraul>
3M seems to have a lot of tapes
<wpwrak>
a separate sheet would also make it easier to see damage
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<wpwrak>
i think that's an understatement ;-))
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<DocScrutinizer51>
wait what? you're now planning to stick the shielding (X) *to the PCBA*??
<DocScrutinizer51>
that's for sure not what I suggested
<DocScrutinizer>
this definitely won't work for the intended purpose
<DocScrutinizer>
I suggested to stick the X to the plastic plate of the case, not to the PCB
<DocScrutinizer>
we talked about this to gory detail, about using conducting posts to connect to the (protective) GND of the PCB via the mounting holes for the posts
<DocScrutinizer>
about no concerns that glue does NOT conduct as we can connect each bar of the X separately so the X has no need to connect in the center where the bars cross each other
<DocScrutinizer>
IIRC you complained that it's much manual work to cut that metal sheet to shape, and I suggested to use sticky tape *instead*
<DocScrutinizer>
btw IIRC I also suggested you could use aluminium varnish spray and coat the inside of your plastic case plate
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<DocScrutinizer>
and you for sure won't need to isolate any of the tape or varnish against the plastic
<DocScrutinizer>
and depending on mechanical rigidness of both the PCB and the case plastic plate (with attached conductive shield) you may omit the isolation sheet between the both
<DocScrutinizer>
when there's like 10mm distance from highest capacitors or whatever on PCB down to the bottom plate of the case with the shield, then the air should isolate enough and no way case or PCB would bend so they touch each other
<DocScrutinizer>
o/ daywork
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<wolfspraul>
DocScrutinizer - ok cool, read your response - thanks!
<wolfspraul>
so...
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<wolfspraul>
the first misunderstanding was that you mean to glue the tape on the inside of the bottom acrylic
<wolfspraul>
meant
<wolfspraul>
that will not be 10mm from the capacitors, maybe only 3-5 or so
<wolfspraul>
and as far as the pcb touching on the tape, why not just take a tape where the top side is insulated? that would prevent that for sure
<wolfspraul>
so it's 3-layer - glue, then aluminum/copper, then insulation
<wolfspraul>
glue that in a large X onto the inside of the acrylic bottom panel, connecting only on one side of the 2 strips
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<DocScrutinizer51>
yes
<DocScrutinizer51>
ack
<DocScrutinizer51>
you also want to have tape on edges
<DocScrutinizer51>
so a rectangle with an X inside
<DocScrutinizer51>
unless your acrylic s already in a metalframe
<DocScrutinizer51>
ttyl
<DocScrutinizer51>
-15 here. cig at work
<DocScrutinizer51>
outside :-/
<viric>
cig?
<larsc>
cybernetic implant growth
<viric>
:)
<larsc>
and apparently those start to fail start to fail at -15C
<viric>
it's a matter of changing the antifreeze, simply