#qi-hardware IRC log for Tuesday, 2010-07-20

wolfspraulwpwrak: don't try to break open the hinge, I am trying to send you some individual plastic parts00:01
wolfspraulthe hinge itself needs a fixture and a lot of pressure to be assembled00:02
wpwrakwolfspraul: it's exactly the breaking thing that i'm trying to avoid ;-)00:02
wpwrakwolfspraul: (fixture) ah, that makes sense then. (individual parts) great, thanks !00:03
wpwrakby the way, have you found out what sort of plastic this is ?00:03
wolfspraulhah, no00:04
rafawpwrak: sort of plastic: why should it be important to know?00:05
wpwrakstill on the list or are they reluctant to reveal their secret formula ?00:05
rafawpwrak: for copyleft idea?00:05
wolfsprauldon't know, need to ask00:05
wolfspraulwe will find out about it, no worries. but give me some time...00:06
rafawolfspraul: sure, you have a couple of hours00:06
wpwrakrafa: if it's something reasonably common, one can find out lots of material properties. such as how much abuse it can handle before breaking, temperature range, etc. much nicer to look things up in a table than to conduct the corresponding destructive experiments :)00:06
wpwrakrafa: besides, i like how it machines. i'm looking into buying some plastic for machining and if this is similar to one of the common plastics, that would help me speed up the selection process.00:08
rafawpwrak: ah.. nice. and would you buy some plastic here? or it is hard to get?00:09
rafathe (the same kind)00:09
wpwrakwolfspraul: what do you think about wqvga ? is this an idea you like (in general) ?00:09
wpwrakrafa: depends on what it is :) there are various shops that sell plastics00:09
wpwrakgrmbl .. now if i could just find my list of them ... i researched that stuff a few months ago00:11
rafaha.. now is when you start to think that find command should have some kind of AI  :)00:11
wolfspraulwpwrak: you mean higher resolution lcm?00:12
wpwrakwolfspraul: maybe same pixel size but a bit wider. 3.5" should fit more or less. depends a bit on how messy the cable is.00:12
wpwrakrafa: some sort of "recently edited files" would be useful at times ...00:13
rafawpwrak: cd / ; egrep -r -AI "I wrote a plastic shopping list a couple of months ago" .00:14
wpwrakrafa: found it. http://www.tecnoplast-rosario.com.ar http://www.heling.com.ar/00:15
wpwrakrafa: heling seem to have pretty much everything00:16
rafawpwrak: sometimes I would need some easy merge: when I do not find an old file I wrote I writ a new one, but then, several days after I find the older one.. so I realize that I have several files with similar info inside :P00:17
wpwrakjust call them "section A" and "section B" ;-)00:18
rafaheling.. : yeah.. it looks interesting.. and it is in Palermo, no so far00:19
wpwrakthis site has lots of infos about plastics: http://www.boedeker.com/mguide.htm00:20
wpwrakwell, material data.00:20
wolfspraulwpwrak: I don't think about it much at all, it's just one of the many 'wish list' items for Ya00:20
wpwrakwolfspraul: so what are the big ones then ?00:21
wolfspraulmore memory, usb host, free rf00:21
wpwrakwolfspraul: good. to what extent are you going to change the case ?00:22
wpwrakwolfspraul: regarding rf, there seem to be two main camps. the ieee ...15... family, all at 2.4 GHz, with zigbee and similar, and the sub-ghz stuff. most of the latter is 800/900 mhz, but there are a few at 400. most of them can probably talk to each other, as long as they support the same type of modulation (ook/fsk)00:24
wolfspraulchange case - don't know it's too early00:24
wolfspraulrf - yes that's also my state of knowledge00:25
wolfspraulsorry have to go get some lunch - very hungry :-)00:25
wpwrakwolfspraul: with 800/900 out due to messy regulations, that leaves 434 MHz and 2.4 GHz. the 434 MHz stuff is all relatively basic. the silabs chips are already at the top end in terms of built-in "intelligence".00:25
wpwrakwolfspraul: 2.4 GHz has more advanced chips. e.g., the Atmel AT86RF230. http://www.atmel.com/dyn/resources/prod_documents/doc5131.pdf00:27
wpwrakwolfspraul: this one supports IEEE 802.15.4 in general, not only ZigBee (not sure yet to what extent the chips advertized as zigbee are limited to zigbee. chances are that many can also do other ieee 802.15.4 protocols)00:28
wpwrakheh, in one of my bens, the crystals have a bit of red glue on top. i guess that should be at the bottom, to attach them to the pcb :) i wonder if this is a common mistake. (haven't pried apart the other ben yet)01:23
Action: wpwrak wonders why those not very smt-friendly packages are still so common for crystals when there are nice flat smt packages available01:25
wpwrakpity that the SPI on the display is only gpio-based. there would be plenty of room for a wireless module ...01:48
wpwrakactually, if it is spi ... the signal names use i2c terminology. would be pretty unusual, though. checking ...01:50
wpwrakyup. it's spi.01:53
wolfspraulwpwrak: you found spi on the pcb behind the lcm?02:50
wpwrakwolfspraul: i just looked at the schematics and the data sheet02:55
wpwrakto resume the RF discussion. the thing that's a bit uncertain about IEEE ...15... is the distance. e.g., zigbee is designed for about 10 m. nevertheless, some experiments seem to have yielded > 300 m (doubtlessly under quite ideal conditions, but it's still a lot)02:59
wpwrakwolfspraul: oh, and if you want an 802.11 module with a bit of real documentation (but still hidden internals), here's one: http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en54801403:00
wpwrakwolfspraul: big (21 x 31 mm) and expensive (USD 26.57 in quantity), though03:01
uncloudedhow do I get my openwrt init script in /etc/init.d to automatically be symlinked in /etc/rc.d?06:30
kyakyou put this script manually in /etc/init.d, how do you think it will be automatically symlinked in /etc/rc.d?06:40
uncloudedHow does it work on OpenWRT?  On Debian I use update-rc.d but with OpenWRT it looks like the order is embedded in the init.d script like this: "START=40" so I guess something auto links the script using that info06:42
uncloudedsorry to answer my question.  The link is auto-created when I run "/etc/init.d/setfont2 enable"06:44
uncloudedwhen a package is installed as part of the OpenWRT rootfs, does the build system automatically enable all init scripts?06:48
wpwrakrafa: seems that the 915 MHz band is available in argentina. possibly also 868 MHz. hah :)19:47
rafaso we would be able to use some kind of wireless with that? :)20:00
wpwrakrafa: yup. up to something like 256 kbps.20:14
qi-commitsXiangfu Liu: update the email address. http://qi-hw.com/p/xburst-tools/19bc94323:01
qi-commitsXiangfu Liu: [usbboot] remove debug output http://qi-hw.com/p/xburst-tools/4a4b5ad23:01
qi-commitsXiangfu Liu: add stage1 stage2 option http://qi-hw.com/p/xburst-tools/2011a3923:01
--- Wed Jul 21 201000:00

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