| 00:46.06 | flyback | guys |
| 00:46.57 | flyback | http://www.halted.com/commerce/catalog/product.jsp?product_id=20950&czuid=1148776735262 |
| 00:46.57 | FireEgl | o_O |
| 00:47.08 | flyback | catch is the pens are $40 |
| 00:47.13 | flyback | unless you can find alternatives |
| 00:47.23 | flyback | battery and psu are easy to hack up something that works |
| 01:25.13 | flyback | http://vids.myspace.com/index.cfm?fuseaction=vids.individual&videoid=742872163&n=2&&Mytoken=10029B07-DE3A-15B6-1986A7934D3F66AC8477405 |
| 01:25.16 | flyback | HAHAHAHAHAHAHA |
| 01:25.17 | flyback | OMG |
| 01:25.22 | flyback | HAHAHAHAHHAHAHAHA |
| 01:34.19 | *** join/#edev pierrelux (n=pierre-l@174-238.sh.cgocable.ca) |
| 01:45.10 | davidc__ | joe_bleau: what about RFID? |
| 01:45.16 | davidc__ | joe_bleau: just workin on that kinda stuff now |
| 01:56.19 | joe_bleau | LF ASK read/write |
| 01:56.39 | joe_bleau | Found serious bugs in a board level product, so I'm thinking about rolling our own using the EM4095 |
| 01:56.51 | davidc__ | LF - as in? |
| 01:56.56 | joe_bleau | 125 kHz |
| 01:57.02 | davidc__ | heh, doing that right as we speak |
| 01:57.37 | davidc__ | using the atmel u2270b |
| 01:57.44 | joe_bleau | Yeah, I looked at that one too. |
| 01:58.03 | joe_bleau | I'm seeing a severe tempco with the carrier freq on this board |
| 01:58.04 | davidc__ | haven't done writes with the one I'm running - but I can confirm it does read a tag @ ~ 4cm |
| 01:58.12 | joe_bleau | I think they're using the atmel chip too |
| 01:58.26 | davidc__ | joe_bleau: personally - if I had to do it again - I'd do it with all discreets |
| 01:58.31 | joe_bleau | Really? |
| 01:58.35 | davidc__ | ya.. its pretty simple |
| 01:58.47 | joe_bleau | AM demod, coil driver, sure... |
| 01:58.56 | joe_bleau | I even had thoughts of an AGC loop |
| 01:58.58 | davidc__ | AM demod = 3 components |
| 01:59.05 | davidc__ | coil driver = 2 fets |
| 01:59.21 | joe_bleau | One feature that sounds nifty on the EM4095 is the PLL |
| 01:59.48 | joe_bleau | After being burnt by freq shift, it sounds nifty anyway. |
| 02:00.06 | davidc__ | anyhow - I can confirm that the u2270b does seem to work - but OTOH - I'm using all low tempco parts on the board |
| 02:00.09 | davidc__ | [caps + res's] |
| 02:00.20 | davidc__ | haven't tried any sorta experiments with temp though] |
| 02:00.41 | joe_bleau | Check the datasheet; I think the internal oscillator is an RC and drifty. |
| 02:00.44 | davidc__ | just FTR - with just the recommended 125khz set resistors - it nails it right on the dot |
| 02:00.59 | joe_bleau | That's encouraging at least. |
| 02:01.10 | davidc__ | I'm also using a little auto tuning circuit |
| 02:01.22 | davidc__ | which is given in the DS |
| 02:01.23 | joe_bleau | Yeah? |
| 02:01.29 | davidc__ | in the u2270b datasheet |
| 02:01.38 | joe_bleau | I'll have to dig; mine is at work. |
| 02:01.55 | davidc__ | grab it off the web :P |
| 02:02.06 | davidc__ | anyhow - I gotta get back to work on the firmware for that same board... |
| 02:02.07 | joe_bleau | Trying to now |
| 02:02.16 | davidc__ | leave any questions here, I'll answer em next time I'm back @ this comp |
| 02:02.23 | joe_bleau | Thanks! |
| 02:03.58 | davidc__ | I'm gonna post all the designs / schematics / gerbers / software for this design on the net someday fairly soon |
| 02:04.01 | davidc__ | soon as I get it working |
| 02:11.05 | joe_bleau | I'm considering a running traces on the PWB for the antenna |
| 02:11.33 | davidc__ | joe_bleau: yeah, I was gonna do that, but I couldn't afford to do a few board revs to get it right :P |
| 02:12.19 | joe_bleau | I can. I'm certain that somewhere there's a program to at least estimate the inductance from the trace layout |
| 02:12.42 | davidc__ | joe_bleau: yup - there probably is |
| 02:12.44 | joe_bleau | Oh, I'm using the Titan/EM4150 series read/write tags |
| 02:12.51 | davidc__ | joe_bleau: never used em :P |
| 02:12.56 | davidc__ | I'm just using the atmel ones |
| 02:13.02 | davidc__ | [aka, what I could get from digikey] |
| 02:14.47 | joe_bleau | The Atmel part would be more compelling if it ran on 3.3V |
| 02:17.20 | davidc__ | eh, yet another reason to do it with discreets |
| 02:17.43 | davidc__ | especially if you've got any kind of processing power onboard |
| 02:18.06 | joe_bleau | I was thinking H8/Tiny or Philips LPC arm as the micro |
| 02:18.30 | joe_bleau | Either would be able to generate the 125KHz signal |
| 02:18.32 | davidc__ | if you have processing power, + a fast A2D converter, you could probably do most of the demodulation in software |
| 02:18.40 | joe_bleau | Hmm. |
| 02:18.57 | davidc__ | and signal generation as well - you could easily look @ your recovered waveform + tune the generated frequency to match the LC |
| 02:19.22 | joe_bleau | I'm not sure that is a win, considering the cost of the ADC vs. AM decoder and data slicer |
| 02:19.30 | davidc__ | I more meant if you' |
| 02:19.38 | davidc__ | ve already got processing power to spare :P |
| 02:19.43 | davidc__ | I don't know what you'd be adding this to |
| 02:20.15 | joe_bleau | It's standalone, to replace the $500 industrial units I'm not happy with |
| 02:20.16 | davidc__ | its obviously not a win for a stand alone solution |
| 02:20.21 | davidc__ | heh |
| 02:20.29 | joe_bleau | Just give me a RS-232/485 port and read&write the tags! |
| 02:20.34 | davidc__ | hmm, I might be able to arrange a loaner of this board I have |
| 02:20.36 | joe_bleau | Oh, and work over temp |
| 02:20.40 | davidc__ | [rs232, reading tags at least |
| 02:21.07 | davidc__ | if you can wait a few weeks, I might be able to loan ya a single one of this board here.. if you promise to give it back :P] |
| 02:21.25 | davidc__ | it doesn't have the max232 on board, you'd need to do that offboard |
| 02:21.38 | joe_bleau | That's a generous offer, but you probably wouldn't want it back when I got done. |
| 02:21.38 | davidc__ | but it does talk rs232, and read tags - writing should just be a software matter |
| 02:21.57 | joe_bleau | It'll be potted and subjected to a rather nasty environment |
| 02:22.00 | davidc__ | all the necessary IO pins are at the mcu... huh.. eww |
| 02:22.03 | davidc__ | yeah... no :P |
| 02:22.09 | joe_bleau | Yep. |
| 02:22.26 | davidc__ | If you want to buy one off us, I could probably work something like that for 60-100 bucks |
| 02:22.29 | davidc__ | have to talk to the other guy |
| 02:22.56 | joe_bleau | Lemme see how the EM4095 hack goes. I should have their demo kit middle of next week. |
| 02:23.00 | davidc__ | k. |
| 02:23.28 | davidc__ | what environment is this going in anyhow? |
| 02:24.06 | joe_bleau | Harsh industrial |
| 02:25.32 | joe_bleau | Wound an antenna the other night, got my Waketek set to 125kHz. Just need to find time |
| 02:25.51 | joe_bleau | to resonate the sucker and 'scope the AM. |
| 02:26.08 | joe_bleau | I can program the EM4150 tags to auto transmit a range of registers when they power up |
| 02:26.27 | joe_bleau | At least that way I don't have to communicate with the tag to see some activity |
| 02:31.29 | davidc__ | heh, sounds like you're more on the ball then I am with this stuff :P |
| 02:33.43 | joe_bleau | Not at all! |
| 02:34.12 | joe_bleau | I should have started this last year, but it kept getting pushed back in the queue. |
| 02:35.18 | joe_bleau | <PROTECTED> |
| 02:48.50 | davidc__ | joe_bleau: just thought, as a last resort - couldn't you somehow cool reader - say with a peltier or something? |
| 02:48.56 | davidc__ | probably not cheap, but if everything drifts... |
| 03:01.18 | flyback | http://www.pcworld.com/news/article/0,aid,125772,pg,2,00.asp# |
| 03:18.52 | sunrunner20|slee | which reader? |
| 03:24.11 | prpplague | flyback: well you were right, hereafter was pretty darn good |
| 03:38.46 | flyback | :) |
| 03:38.51 | flyback | yeah that ending blew me away |
| 03:40.00 | flyback | prpplague make sure you ready this |
| 03:40.01 | flyback | http://www.pcworld.com/news/article/0,aid,125772,pg,2,00.asp# |
| 03:40.41 | flyback | wow freedos is looking promising on the low end where linux is kinda top heavy |
| 03:41.31 | flyback | real low end like 8086-386,486 :P |
| 03:43.10 | flyback | I love the one guys line "I got issues" |
| 03:43.11 | flyback | hahaha |
| 03:47.25 | joe_bleau | I'd need a heater, not a cooler, and yes, my backup plan is to epoxy some 100 ohm resistors to the oscillator. |
| 03:47.37 | joe_bleau | But it's still open loop, and I don't think it will fix the problem. |
| 03:47.40 | flyback | heater for what |
| 03:47.51 | joe_bleau | scroll up, bud. |
| 03:48.17 | flyback | oh I see |
| 03:48.21 | flyback | to fix the thermal drift |
| 03:48.24 | flyback | hmmm |
| 03:48.31 | flyback | I KNOW |
| 03:48.36 | flyback | USE A P4 CPU! |
| 03:50.24 | flyback | sorry :P |
| 03:50.40 | flyback | what about a piece of that stuff they use for wrappnig water pipes |
| 03:50.41 | flyback | that heats |
| 03:51.48 | flyback | might give you a nice uniform heat |
| 03:53.38 | flyback | joe check www.bgmicro.com for the hell of it |
| 04:02.44 | flyback | http://www.newegg.com/Product/Product.asp?Item=N82E16822998003 |
| 04:02.47 | flyback | man they got cheap |
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| 17:46.49 | socketERR | where can i found cheap embedded boards (also used boards)? |
| 17:49.49 | prpplague | ebay |
| 17:49.58 | prpplague | socketERR: what kind are you looking for? |
| 17:53.38 | socketERR | a board wird 3 NICs or USB support |
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| 18:47.53 | davidc__ | socketERR: how much processing power? |
| 18:48.08 | davidc__ | socketERR: I've seen 3 nics done with a 20mhz micro :P |
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