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| 14:33.32 | *** topic/#edev is a channel for the discussion of hacking small consumer electronic devices, mostly ARM based |
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| 18:26.41 | prpplague | MonMotha: ping |
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| 20:16.00 | Crofton | ~quote scox |
| 20:28.29 | agaffney | ...down, down, down, and the flames went higher. |
| 20:28.45 | agaffney | for some reason, Ring of Fire came to mind :P |
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| 20:56.25 | MonMotha | prpplague: pong |
| 20:56.39 | prpplague | MonMotha: nm, too late, had an EE question |
| 20:59.09 | MonMotha | ok |
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| 21:02.58 | prpplague | MonMotha: i'm still a back room hack, never really trained in EE |
| 21:03.29 | prpplague | MonMotha: so sometimes i get stuck on stuff that probably got taught in EE101 classes |
| 21:06.02 | MonMotha | mmm....circuits :) |
| 21:06.12 | MonMotha | (which is actually a 200 level class at many schools) |
| 21:06.24 | prpplague | ahh |
| 21:07.04 | MonMotha | it isn't uncommon for there to not be a single class in your engineering major when you first start |
| 21:07.16 | MonMotha | everything is taken up by math and basic science (physics/chem) |
| 21:08.27 | prpplague | MonMotha: 1.9V led at .004A needing to be powered by a 5v source and triggered with a 3.3v ttl |
| 21:09.05 | prpplague | MonMotha: had to lay it all out and calculate the resistor values along with the voltages when using a npn (mmbt2222a) |
| 21:09.15 | MonMotha | ah, yes |
| 21:10.54 | MonMotha | figure ~0.2V across the transistor (datasheet may be more exact), 1.9 across the LED, work out the current for the series resistor from 2.1v drop, gate the BJT with your 3.3V through another resistor, which you can work out the current from using the maximum base current from the datasheet (and you want to probably halve that, since it'll already be in the mA range) |
| 21:11.20 | MonMotha | could the 3.3V IO not power the LED directly? |
| 21:13.33 | prpplague | MonMotha: naw its TTL from a SoC style device with a pretty low max current draw |
| 21:13.52 | MonMotha | ah, ok |
| 21:13.53 | prpplague | MonMotha: yea i actually found this page - http://www.iguanalabs.com/1stled.htm |
| 21:14.05 | MonMotha | in that case you'll obviously want to limit base current appropriately |
| 21:14.12 | MonMotha | you could consider using a FET instead of a BJT |
| 21:14.18 | MonMotha | then you would have no IO current draw |
| 21:14.41 | MonMotha | also would eliminate the series resistor |
| 21:14.56 | prpplague | MonMotha: yea, just that we already stock the mmbt2222a for this design anyway |
| 21:14.59 | MonMotha | since you wouldn't need it on the gate (just on the LED for current limiting) |
| 21:15.02 | MonMotha | ah, ok |
| 21:15.15 | prpplague | MonMotha: try to reuse what we stock already |
| 21:15.19 | MonMotha | indeed |
| 21:15.30 | ds2 | doesn't TTL sink better then it can source? |
| 21:15.57 | prpplague | MonMotha: our EE that was incharge of our low end modifications quit a few weeks ago, so some how i got stuck with some stuff |
| 21:17.15 | MonMotha | ds2: yes, but if you're wanting to drive the LED from a higher voltage and the IO isn't tolerant of that voltage, you're stuck using an external transistor anyway, and if you want to use an N-channel, it has to be active high as the switch is low-side |
| 21:17.31 | MonMotha | also, even with TTL that difference has somewhat disappeared with time |
| 21:17.41 | MonMotha | with CMOS, many IOs are pretty much symmetric |
| 21:18.56 | prpplague | MonMotha: ran out of money after my second year and joined the army to get some $$ |
| 21:19.00 | prpplague | MonMotha: never did go back |
| 21:19.14 | MonMotha | that'll happen |
| 21:19.43 | prpplague | hasn't impacted my earnings too badly |
| 21:20.04 | MonMotha | what's kinda sad is that the degree is mainly useful in getting your first job |
| 21:20.07 | MonMotha | and that's about it |
| 21:20.12 | prpplague | yea |
| 21:20.22 | prpplague | or get your foot in the door |
| 21:20.46 | MonMotha | mostly because all a degree from a US institution shows anymore is that you can put up with a bunch of BS for 4 years, hence the title of the degree "B.S." |
| 21:21.04 | prpplague | hehe |
| 21:22.37 | prpplague | MonMotha: next item on the list is a small reset circuit |
| 21:22.57 | MonMotha | to do what? |
| 21:23.06 | prpplague | MonMotha: i need a reset done about 5ms after the ldo has level power |
| 21:23.20 | MonMotha | well, there's the classic RC circuit approach |
| 21:23.25 | ds2 | aren't there nice 3 terminal chips to do that? |
| 21:23.37 | MonMotha | there are also some handy chips to do that |
| 21:23.40 | MonMotha | Dallas has some nice ones |
| 21:23.53 | prpplague | MonMotha: yea, we have 2 or 3 we use for other projects, i was going to check one of them out |
| 22:02.13 | sunrunner20 | prpplague: whats your major intersection? |
| 22:03.38 | prpplague | sunrunner20: what? |
| 22:03.42 | sunrunner20 | in dallas |
| 22:03.48 | sunrunner20 | for where you live... |
| 22:04.13 | sunrunner20 | i'm talking like franfort and bush :) |
| 22:04.16 | sunrunner20 | err |
| 22:04.19 | sunrunner20 | toll way |
| 22:04.32 | prpplague | sunrunner20: 121 and 820 |
| 22:05.22 | sunrunner20 | i've not got dfw in my head yet |
| 22:05.27 | sunrunner20 | anyway |
| 22:05.30 | sunrunner20 | gotta shower |
| 22:05.59 | prpplague | sunrunner20: http://maps.google.com/maps?f=q&hl=en&q=2190+regal+parkway,+euless,+texas+76040&sll=37.0625,-95.677068&sspn=31.922255,59.765625&ie=UTF8&ll=32.812742,-97.101116&spn=0.033038,0.058365&z=14&iwloc=addr&om=1 |
| 22:07.45 | prpplague | google's maps are out of date |
| 22:10.44 | sunrunner20 | heh |
| 22:10.44 | sunrunner20 | same area |
| 22:10.44 | sunrunner20 | still ~1hr apart |
| 22:10.45 | sunrunner20 | closer to two w/ traffic >_> |
| 22:10.52 | prpplague | ahh |
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