Electrical Engineering

angelatlarge

12:48 AM

@rawbrawb We fight for groan rights!

angelatlarge

1:08 AM

@rawbrawb You gotta fight! For your right! To groooooo-AN!

angelatlarge

3:04 AM

@ThePhoton Really, we needed that starred?

8 hours ago, by Nick Halden

ATTENTION EVERYONE: I would like to make a comment on our chatroom as a whole: You all are atrocious at choosing what to star.

The Photon

@angelatlarge Did I star it?

angelatlarge

@ThePhoton I thought you did, since I've been doing nothing but staring at an empty chat screen :), then you showed up, and then it showed up in the star list. But maybe my diff failed and you stared something else?

The Photon

@angelatlarge No, I haven't starred anything all day. I'm pretty sure that go starred as soon as it got posted.

angelatlarge

@ThePhoton Oh, you know what? Possibly my movement detector did not talk to my feature detector: there was probably movement due to some timestamp rolling over or something, and I took that to mean that you starred the bands, since I don't remember them being starred before. Ha! Sorry 'bout that. I'll save the khard time for later :)

The Photon

Last thing I starred:

Apr 27 at 16:56, by Anindo Ghosh

angelatlarge

3:12 AM

@ThePhoton It really is amazing how different that looks on my two screens.

@ThePhoton Nice pic though

The Photon

Actually I'm wrong ... the "starred by me" list isn't sorted by date.

Probably this:

May 24 at 16:23, by jippie

a non-MathJax chat is soooooooo $$23^{rd} of May\ 2013$$

rawbrawb

@angelatlarge he lives in a beautiful place, must be harsh with the lights shining into the windows though.

angelatlarge

@ThePhoton I am sorry, I really didn't mean to waterboard you.

@rawbrawb But people come and bring food!

rawbrawb

@angelatlarge ah yes, ... he was saying that he's getting chubby. Plus all the creepy dudes hanging around at night with cameras .....

angelatlarge

@rawbrawb ...with long zoom lenses

rawbrawb

3:22 AM

@angelatlarge I was going to get pedantic on you, but I'll wait until @AnindoGhosh gets back and HE can correct that statement, since he takes such joy from being that way ...

angelatlarge

@rawbrawb Consider it a double-whammy then :)

The Photon

@angelatlarge I had to run a root-cause-analysis meeting at work today --- your waterboarding pales in comparison.

angelatlarge

@ThePhoton Well, at least it wasn't a root-canal-analysis...

rawbrawb

@ThePhoton was it all formal with DOE etc.? fun fun fun.

The Photon

@rawbrawb No, just throwing stuff up against the fishbone diagram to see what sticks.

Anindo Ghosh

3:24 AM

GrEEtz ppl! I head towards my computer, and it goes "whump"!

rawbrawb

@angelatlarge you know in venice that has a whole other meaning.

Anindo Ghosh

@rawbrawb What statement must I correct?

The Photon

Everybody please go vote to close the microwave turntable question.

rawbrawb

@AnindoGhosh what do you mean by "it"?

angelatlarge

@AnindoGhosh Please don't

Anindo Ghosh

3:25 AM

@rawbrawb My computer

angelatlarge

@ThePhoton I am not old enough.

Anindo Ghosh

@angelatlarge OK :-)

angelatlarge

@rawbrawb In Venice it has no meaning, since they speak Italian, and their word for "root canal" is probably Mama Mia!

rawbrawb

6 mins ago, by angelatlarge

@rawbrawb ...with long zoom lenses

angelatlarge

@AnindoGhosh Someone insists.

rawbrawb

3:26 AM

@angelatlarge Sigh, but to the english speaking people it has meaning.

The Photon

@angelatlarge FAQ says you only need 250 rep to vote-to-close.

angelatlarge

@rawbrawb To the English-speaking residence of Venice?

rawbrawb

@ThePhoton you know it should be flagged to be nuked, not just closed.

Anindo Ghosh

@ThePhoton That question had me laugh out loud. What was she thinking?

angelatlarge

@ThePhoton Rly? You don't mean flag?

rawbrawb

3:27 AM

@angelatlarge the buildings are flooded AND they talk!

Anindo Ghosh

@angelatlarge residents

The Photon

@angelatlarge YOu're right. 250 to vote to close your own question. 3000 to vote to close others.

rawbrawb

@AnindoGhosh my way of correction is funnier

angelatlarge

@ThePhoton Not old enough.

Anindo Ghosh

@rawbrawb True, but given past track record, I'm not sure @Angela would understand your way.

rawbrawb

3:29 AM

@AnindoGhosh how true, sadness ensues...

Anindo Ghosh

@ThePhoton Hmm hold on, why would one vote to close one's own question? Why not just delete it?

angelatlarge

@AnindoGhosh That does seem like an odd one. How many reps do you need to downvote your questions and answers?

The Photon

@AnindoGhosh Got me. Right way, wrong way, stackexchange way?

Anindo Ghosh

@angelatlarge You can NOT (up or down) vote your own posts.

angelatlarge

@AnindoGhosh Sorry. Forgot the <joke> tags.

Anindo Ghosh

3:31 AM

@angelatlarge Too early in the day for me to properly parse non-tagged hilarity.

@ThePhoton I can see one use-case though: Ask a question, answer it, accept it, then prevent anyone else from having a contrary view :-)

What's this Teledyne girl thing from @jippie that's in the stars? Who's she?

rawbrawb

@AnindoGhosh patent_that

Anindo Ghosh

@rawbrawb Too late, whoever implemented that functionality node, must have documented that use-case.

I'm still flummoxed by that microwave table question... So how does one decide "Hey, let's ask this here, EE.SE seems to be the official site for this store"?

rawbrawb

@AnindoGhosh at least it wasn't personal ala TMI type of stuff.

@AnindoGhosh maybe she thought it was "stuff exchanged" when we make errors ...

Anindo Ghosh

@rawbrawb Yeah, maybe we needed to have commented "Please provide your credit card number and code at the back of the card, so we can identify you as a genuine customer"

angelatlarge

@AnindoGhosh Deleted question bears no rep

@rawbrawb nice!

Anindo Ghosh

3:38 AM

@angelatlarge Are you sure you're not referring to some of the NSFW subreddits on Reddit.com?

angelatlarge

@AnindoGhosh Except the necesities

The Photon

@AnindoGhosh I'm pretty sure there's nothing that isn't bared on there.

Anindo Ghosh

@rawbrawb You may have hit the nail on the head.

@ThePhoton Yet, a deleted question would bare nothing.

@angelatlarge Of course not! :-D

The Photon

@AnindoGhosh Not a good way to earn points on /r/nsfw.

Anindo Ghosh

@ThePhoton Wait, there actually is a subreddit that specific? Reddit-->Edit

The Photon

3:42 AM

@AnindoGhosh There are subreddits so specific I won't mention them where coding-corgi and Camil might read about it.

Anindo Ghosh

@ThePhoton Oh wow ohhh wow oh wowowowow wow oh wheeeeeew Reddit really has some really narrow, really specific areas of interest! Not the NSFW one, but others I found by searching for NSFW there.

angelatlarge

@ThePhoton Don't you think they need those more than anyone?

@AnindoGhosh Is 33K the least contrasty resistor, usually? Is it a good worst case for lack of contrast in resistor bands?

Anindo Ghosh

I'm amazed. People actually share photos of roadkill?

rawbrawb

@AnindoGhosh you like your mother in law?

Anindo Ghosh

@angelatlarge orange or yellow on beige would be least contrast for beige body. Green for green body.

rawbrawb

3:45 AM

@angelatlarge there were a some resistors that were transparent on a glass body.

angelatlarge

@AnindoGhosh Yellow is usually worse, but there is no 555 resistor even in the E192 series.

Anindo Ghosh

@angelatlarge I'm just thinking individual bands. Green on green, green or blue on aqua, etc.

@angelatlarge And I think I've seen a purple body on a resistor (or it could have been an inductor)

angelatlarge

@AnindoGhosh Yes, but the next step from that is "worst possible resistor" in terms of "all bands are minimally contrastive".

@rawbrawb Do you have any of these?

@AnindoGhosh Can you send me a pic or two of a green resistor please?

The Photon

Okay, Lance. For entry into the college bowl, spell 'Throbbing'

rawbrawb

@angelatlarge yep, send me your cc #

Anindo Ghosh

3:47 AM

@rawbrawb I've only seen glass body resistors for the 0-ohm value

@rawbrawb Also known as fuses

rawbrawb

@AnindoGhosh I was thinking of implantable RFID tags.

angelatlarge

@AnindoGhosh So, I think the worst is a 5% 33K, since it will be orange orange orange gold. Maybe 330K is worse.

rawbrawb

@ThePhoton thats pretty awesome.

The Photon

@rawbrawb Apparently he actually made the website.

angelatlarge

@rawbrawb And then they made porn of it. It's pretty hot

Anindo Ghosh

3:50 AM

@ThePhoton Yes, I just scanned the gallery, and Rupa Dasgupta is nice

The Photon

@AnindoGhosh But can she shred?

@AnindoGhosh She's not Rupa from "Rupa and the April Fishes" is she?

Anindo Ghosh

@ThePhoton Like I care... those eyes!

@ThePhoton No, that Rupa has frizzy hair I think.

BRB breakfast.

rawbrawb

@AnindoGhosh Dasgupta is a German-Indian name right?

The Photon

@AnindoGhosh Yes, but her I've seen live.

@rawbrawb Groan?

angelatlarge

@rawbrawb GROAN!

rawbrawb

4:14 AM

*GROAN*

Anindo Ghosh

4:30 AM

@rawbrawb ROTFL

The Photon

ROTFLMAOPIC:

0

Q: Is the integrated circit alien tech?

If we go here to https://en.wikipedia.org/wiki/Integrated_circuit we see "early developments of the integrated circuit go back to 1949, when the German engineer..." and we know many people from Germany came here as part of operation paperclip after the war to work on top secret operations and the...

integrated-circuit

rawbrawb

4:48 AM

@ThePhoton That was close .... I almost got found out.

user61389

5:18 AM

@Littlegator hi, about your ZIF socket board: I don't use microchip tools myself, but as far as I know there is no such board. Perhaps you could make it yourself :) and there are of course programmers with a socket, like this one.

user61389

(I'm out)

jippie

5:56 AM

@AnindoGhosh She's Italian, lives near Oxford (UK) and she is good looking smart nerd girl. I think I'm definitely going to buy a Teledyne scope.

@NickHalden I only obey chat rules that are officially set by @Kortuk

@DavidKessner Law #7: All microcontrollers are equal, but some microcontrollers are more equal than others.

jippie

6:16 AM

that should read "commandment #7" of course

Anindo Ghosh

6:32 AM

@ThePhoton When I read "Alien tech", I assume that means "Made in China"

jippie

morning

Inspired by this question:

2

Q: Three Phase Input to Single Phase Output

We have three phase input and the voltages in the three input is not the same always. Sometimes, one or two or three phase will be off. I would like to connect the phase to output which lies within the range (110 - 290). Below will be the example, Phase 1 (290v), Phase 2 (245v), Phase 3 (190v) ...

multiplexer high-voltage comparator

I was wondering if a problem like this could be solved with a 3ph to 1ph transformer.

I have no idea if a three-to-one phase transformer is viable and how it would work in an asymmetric situation like this one.

abdullah kahraman

7:31 AM

Morning!

abdullah kahraman

8:07 AM

Die you all

Stacey Anne

8:35 AM

hi everyone

abdullah kahraman

@StaceyAnne Hi!

Anindo Ghosh

10:41 AM

@jippie 3-to-1 phase transformers do exist, for connecting 3-phase generators to single phase house wiring - They're sold in India. I believe the efficiency is around 66%, which makes it very wasteful, I guess.

@jippie Found this: carroll-meynell.com/technical-3phase.htm

@jippie polyphaz.com/Three_phase_to_single_phase_transformers.htm

Rocketmagnet

@AnindoGhosh Hi again

Anindo Ghosh

@Rocketmagnet Hi :-)

Rocketmagnet

@AnindoGhosh Can I ask your advice about something?

Anindo Ghosh

@Rocketmagnet If I am able to help, I'd be happy to.

Rocketmagnet

Thanks. Ok, I'm working on a little home project which uses mains (24v AC) but also requires a microcontroller. For this I need to generate a two clean 5v (one for digital and one for analogue), and one 18v, which doesn't need to be that clean.

What do you think is a good way to generate these voltages. I don't need a lot of current, as this is just to power an MCU and an ADC.

@AnindoGhosh - Sorry, I meant 240v AC.

Anindo Ghosh

10:54 AM

@Rocketmagnet Yeah, I was thinking about the 24 V

@Rocketmagnet I routinely use USB cellphone chargers for this kind of stuff.

Rocketmagnet

@AnindoGhosh - Yes, but that only gives be dirty 5v.

Anindo Ghosh

@Rocketmagnet For the 5V supplies, that is. No, not really dirty: A 100 mA 100 mH cheap inductor and a cap make an excellent way to clean up the power with little loss.

Rocketmagnet

ok, nice.

Perhaps I could use two voltage doublers to generate the 18v

Anindo Ghosh

@Rocketmagnet If I need really clean power (rare requirement, mostly for ultrasonic sensors etc), then I have a slew of old 7 to 10 Volt phone chargers, and little veroboards with an AMS1117-3.3 or AMS1117-5.0 plus caps.

@Rocketmagnet Depends how much current you need, the 18 Volt is the irritating one.

@Rocketmagnet I've used laptop power bricks for 16 Volt, 22 Volt, etc, depending on what I need and what rating brick I have. Those are often dirt cheap (< $5) on eBay, used but in full working order. I've not seen an 18 Volt one yet.

@Rocketmagnet OK, I just checked, my HTC USB charger gives 5.1 Volts, with ripple of around 20 mV unloaded, 35-40 mV loaded (500 mA load). Worth checking your available USB chargers similarly.

@Rocketmagnet Ah ha! Just found another hack from an old board: I'd used one side of a tiny audio matching transformer as a common mode choke to filter a particularly noisy power supply. The load is I think about 40-50 mA, which the audio transformer handles with ease.

Rocketmagnet

cool, thanks.

@AnindoGhosh - An off-the-shelf solution makes things much easier.

Anindo Ghosh

11:14 AM

@Rocketmagnet Then look for a laptop brick of around 18V

Rocketmagnet

@AnindoGhosh - And what if you were going to make this from discrete components on a PCB? How would you go about it ?

There seem to be quite a few ways to do this. The obvious one is to use a transformer with 2 taps, but it's proving quite hard to find the right one.

Anindo Ghosh

11:47 AM

@Rocketmagnet Yeah, old-style transformers seem to have vanished off the market: Mostly because the more popular - and more power-efficient - option is an isolating switching device - The transformer needed for these is quite tiny and inexpensive, more so as one raises switching frequency.

@Rocketmagnet If I were building a discrete solution, I'd use two switching regulators, one for 18V and one for 7V. The output of the second would then feed two 5V LDOs. Actually, I doubt I would make two separate 5V outputs at all, just use one.

Rocketmagnet

12:37 PM

@AnindoGhosh - I was thinking of using those LinkZero ones.

Anindo Ghosh

@Rocketmagnet If you can find a suitable, cheap toroidal transformer that fits the LinkZero design requirements, then why not. What do those ICs cost?

Rocketmagnet

@AnindoGhosh - Less than £1. Less than £0.50 in quantity.

Anindo Ghosh

@Rocketmagnet Is there a list of compatible transformers in the datasheet? I see the word "transformer" just once in there.

Rocketmagnet

Problem is, I don't actually know what a suitable transformer would be. It doesn't say in the datasheet what the specs are.

Exactly!

Anindo Ghosh

@Rocketmagnet ah hahaha

Rocketmagnet

12:46 PM

Also, the example schematic doesn't match the example PCB layout.

Anindo Ghosh

@Rocketmagnet I didn't get that far. No transformer = no point

Rocketmagnet

1:02 PM

@AnindoGhosh - Found it: powerint.com/sites/default/files/PDFFiles/der260.pdf

Anindo Ghosh

@Rocketmagnet That has general transformer specifications? Or does it have only a specific transformer suggested?

Hiya @rawbrawb

rawbrawb

@AnindoGhosh greetings!

David Kessner

2:07 PM

Hi all.

rawbrawb

@DavidKessner hey there

angelatlarge

Hallo

David Kessner

Damn, I missed the "Alien Tech" guy. That would have been fun.

rawbrawb

@angelatlarge hello , so far I'm 0 for 2 let's make it 0 for 3?

angelatlarge

@rawbrawb Huh? Nice saturation answer, BTW.

rawbrawb

2:14 PM

@angelatlarge so now it's 1 for 3, meaning I've said "hi" 3 times and you're the only one to answer. I guess I need to brush my teeth more ...

angelatlarge

@rawbrawb Oh, really? I was sleeping. My desktop computer is making a Haar cascade, and has been turned on all night. But it does appreciate clean teeth.

Stacey Anne

hi @rawbrawb

rawbrawb

@StaceyAnne grEEts world traveller!

angelatlarge

@rawbrawb And your teeth are good enough for @StaceyAnne, apparently.

rawbrawb

@angelatlarge Haar cascade? do tell!

@angelatlarge HALitosis 9000 - Good mooooorning Dave!

2

angelatlarge

2:17 PM

@rawbrawb Nice!

@rawbrawb :9688764 Why don't I go get some coffee and you tell me what I should be telling?

rawbrawb

@angelatlarge No groans? I'm slipping up

Stacey Anne

@angelatlarge, what's a haar cascade?

rawbrawb

@StaceyAnne see? @angelatlarge she understood my question.

@StaceyAnne I hope it's not some fiendish technique for taking over the world. --- Only 3 more hours of computation until the Haar cascade starts and all the evil sacks of fluid die die die! I may save that @angelatlarge as a pet, since he created me .... ---

David Kessner

@angelatlarge Fine! HELLO!!! (Is that better?) :)

Oops. I meant that for @rawbrawb.

angelatlarge

@StaceyAnne @rawbrawb It is a trainable image feature recognizer.

rawbrawb

2:29 PM

@angelatlarge I recognized the Haar name from some wavelet work I did once, but I'm totally out of the loop on more recent applications. So you're processing a bunch of images to get the basis vectors?

@DavidKessner Nope! you're yelling now!

angelatlarge

@rawbrawb Are you asking me about how it works?

rawbrawb

@angelatlarge only in rough terms ... more precisely, what is the "cascade" part?

angelatlarge

@rawbrawb I have a very hazy understanding of it, but the cascade part is that these recognizers work in stages: usually on the order of 20 or so. Each stage is pretty terrible in and of itself, but summed they give pretty good results.

18 hours ago, by angelatlarge

Viola–Jones object detection framework

The Viola–Jones object detection framework is the first object detection framework to provide competitive object detection rates in real-time proposed in 2001 by Paul Viola and Michael Jones. Although it can be trained to detect a variety of object classes, it was motivated primarily by the problem of face detection. This algorithm is implemented in OpenCV as cvHaarDetectObjects(). Components of the framework Feature types and evaluation The features employed by the detection framework universally involve the sums of image pixels within rectangular areas. As such, they bear some rese...

(same thing)

coding_corgi

yo_yo_yo

@angelatlarge <jk>Again with the Viola?</jk>

angelatlarge

@coding_corgi Yeah, this is the third time I post this link. I am just a one-trick pony, I guess

Stacey Anne

2:37 PM

@angelatlarge, that's very interesting. What is your intended application?

angelatlarge

3

Q: Cat Detection Using Haar Training

I would like to detect deformable objects (a CAT in my case) , using HAAR- cascades . I ran the test on 2000 positives and 3000 negative images upto 20 stages . I don't see anything expected happening. I am sure it might be the problem of my training data set. My positive data set has the cat i...

opencv

@StaceyAnne (no, not really)

Stacey Anne

@angelatlarge, haha

angelatlarge

@StaceyAnne I think cats would be very hard. As far as I know this is the kind of thing that most face detectors use

@StaceyAnne And pedestrian detectors

coding_corgi

@angelatlarge So the app will do what?

David Kessner

@angelatlarge I like how this guy detected cats: youtube.com/watch?v=goZ2DqMnaGc

angelatlarge

2:44 PM

@DavidKessner Yeah! That's how I like to do my voltage testing:

David Kessner

@angelatlarge I am doing ESD testing. I've been asking anyone who walks by and stares for too long to lick the end of the ESD gun. Weird, nobody has taken me up on that offer yet....

W5VO

@DavidKessner How do you end up testing ESD? Are you looking for a specific kV rating?

rawbrawb

@DavidKessner all sorts of sly little jokes and visual puns. A lot of thought has gone into that video.

angelatlarge

@DavidKessner Yeah, odd! Nice video though. @jippie should appreciate that. He's been building something like that.

@rawbrawb Hmmm.. I think I mist most of the subtle stuff.

@rawbrawb More kwofi!

rawbrawb

@angelatlarge You need a bigger mug! or an IV drip.

David Kessner

2:57 PM

@W5VO I usually test at several different voltages (8kv, 12kv, 15kv, and 18kv). There are plenty of failures that will occur at some voltages and not others, so you have to test them all.

W5VO

@DavidKessner How do you assess walking-wounded type ESD damage?

and are you primarily concerned with ESD events to outward-facing connectors?

David Kessner

@W5VO But I am only interested in finding weak spots in the design. I'll leave it up to a testing lab to figure out the actual KV rating that we'll put in the manual.

angelatlarge

@rawbrawb I also had hard time with the guy's accent.

W5VO

@DavidKessner gotcha

David Kessner

@W5VO We have no walking wounded. Everything we do ends up with non-walking wounded. :)

W5VO

3:00 PM

@DavidKessner :) I ask because it's a major concern with IC manufacturers - maybe not so critical with finished devices...

David Kessner

@W5VO I'm testing everything. Exposed metal, even if that is an exposed connector pin. Screws and holes in the chassis. Areas around connectors. And any other place that I can discharge a spark.

@W5VO It is absolutely critical to ESD test a finished product. Today, IMHO, it is unthinkable to not test a finished product. There are actually a lot of finished products that might not be damaged by ESD, but will crash, reset, or otherwise fail to work after an ESD strike that is nearby (not even directly zapping the unit under test).

ESD immunity is part of getting CE certification.

rawbrawb

@DavidKessner so the eqt. must be running too.

David Kessner

@rawbrawb Yes. The requirement is that any ESD zap must be recoverable.

W5VO

@DavidKessner Heh, I know we have some coke machines with card readers, and you can discharge a shock anywhere and it'll reset them

David Kessner

@W5VO That is super common, especially if there is a reset line that is ran over a cable. That's why I always treat reset lines with the same EMI/ESD "criticality" as a high speed clock line. ESD will jack you up if you don't

Yesterday I destroyed an Intel I7 based motherboard by zapping the Ethernet ports. Oops! :)

rawbrawb

3:10 PM

@DavidKessner on the the chip side, this wouldn't be considered ESD testing, but the Go/no-go test for further testing, there are so many paths and partial damage mechanisms that these can only be sorted out with zapping, and then burn in and testing for parameteric shifts and activation energy calculations. However, in your case, it's not like you can go and build 100 units and burn them in for weeks to look for subsequent failures (even from a cost perspective and milestone too)

yogece

hi all

David Kessner

@rawbrawb Yeah, the testing I do is more in-line with CE regulatory requirements.

Annonomus Person

Hello @yogece

David Kessner

@yogece Yo!

Annonomus Person

@yogece So what were you going to say?

yogece

3:12 PM

@AnnonomusPerson i have the code for android

@AnnonomusPerson but you ask me for iphone.

Annonomus Person

@yogece Where is it? Oh... I am using iDroid (android ported for iPhone)

yogece

@AnnonomusPerson wait

Annonomus Person

@yogece Look here to see what I did/am going to do : lifehacker.com/5693309/…

Yeah... in hindsight it does seem confusing at first... but it is cool [and a bit geeky]

yogece

@AnnonomusPerson i am searching for the code.actually i format my system i kept that some where

coding_corgi

@DavidKessner Hey hey hey! No copying!

David Kessner

3:15 PM

@coding_corgi Sorry, I was being dyslexic. I meant, Oy! :)

yogece

@AnnonomusPerson dont you have android device?

Annonomus Person

@yogece Yeah... I have both but for this project I am using a iPhone... I actually haven't decided which one I'll use so let's just pretend it's an normal Android phone.

coding_corgi

@DavidKessner Sure...

angelatlarge

@yogece Hello

yogece

@angelatlarge how r u?

angelatlarge

3:21 PM

@yogece Still sleepy.

yogece

@AnnonomusPerson sorry i lost those files

Annonomus Person

@yogece That's okay.... do you have any advice or anything?

yogece

@AnnonomusPerson yes i will give a tip.first get the .mp3 files with DTMF tone

Annonomus Person

@yogece So I just to play the MP3 files over the headphone wire thingy? How about the receiving circuit on Arduino?

yogece

@AnnonomusPerson go to jetcityorange.com/dtmf and download dtmf files

@AnnonomusPerson i hope you understood about the app part. then for detecting the tone you can use DTMF IC MT8870

Annonomus Person

3:30 PM

@yogece Thanks. Wait... do you know how to receive them on the app? I know how to do the app to Arduino (thanks :) ) but I don't know how to send it back from Arduino to the app. Maybe using a wave shield and some cords so both the in and out can be connected? How about the code for the app?

yogece

@AnnonomusPerson you can generated an FSK like modulation technique by using arduino or even you can try OOK modulation,couple that signal via microphone of your device and then you must look for the frequency of the signal received by the mic.do you want to know about OOK/FSK?

@AnnonomusPerson are you there?

Annonomus Person

3:54 PM

@yogece About the OOK/FSK: Sure. Sorry, I was on the phone helping someone fix a piece of corrupted software. Someone also posted an awesome link to an Android oscilloscope project that is open source; that might help me.

yogece

@AnnonomusPerson no problem.but that may be using stuff like CPLD or FPGA

@AnnonomusPerson wheter you want your own hardware? or ready to purchase hardware?

Annonomus Person

@yogece Disadvantages.... ???? Sorry, I don't know that much about sound technologies. This is one of my first Arduino projects with sound. I am ready to purchase software (that is without paying for an arm and a leg.)

I would however be open to a little hacking (with a guide!!!!!) if I can save a little money. I don't mind doing the work, I just cannot figure out how to do it.

I guess it would be nice to learn something too.

yogece

@AnnonomusPerson check this sparkfun.com/products/10331

@AnnonomusPerson tis too creativedistraction.com/demos/…

Annonomus Person

@yogece That should work for now... I think. Thanks for all the helpful tips and links!

yogece

@AnnonomusPerson its my pleasure.please come again to this chat room and share your experience.that might help me and others

Annonomus Person

4:08 PM

@yogece I will. Two things: How do I save a transcript of this? Also, if you're not in the room, can I still do the @yogece to contact you?

coding_corgi

@AnnonomusPerson You can search for it, and yes you can contact someone by doing the @

@AnnonomusPerson You can save the transcript by bookmarking a certain section of transcript, gimme a sec, ill give you a link...

Annonomus Person

Thanks! I'm going to log off soon... the new message noise keeps scaring me and making me jump. I hang around for a bit more though...

yogece

@AnnonomusPerson go to the top of this current page there you can find "full transcript" then it wil display the transcript for that day you can save by using your browser

coding_corgi

@AnnonomusPerson Whoops...

Annonomus Person

Update: that link would be gdfklj; [noise again] great!

coding_corgi

4:12 PM

@AnnonomusPerson chat.stackexchange.com/transcript/15/2013/5/31, it's at the very bottom

yogece

@AnnonomusPerson if you want to contact me goto my profile page there would be a link for my website ther you can get my contact details

Annonomus Person

OK Thanks.

The Photon

4:48 PM

@W5VO The guy building the finished box is the one who has to pass the test to get mark (CE or whatever). The chip maker is only doing the test to be able to convince the box guy to buy his chips (and to make sure he doesn't blow up chips before they leave the factory).

jippie

5:19 PM

@angelatlarge what was I building again?

angelatlarge

@jippie You forgot again? I think holding 10K in ram might be a bit much for you :)

@jippie You were building a CatGoalie(TM)

@jippie Good morning?

David Kessner

My recent trip to Saudi Arabia made the news! voanews.com/content/…

angelatlarge

@DavidKessner Looking good @DavidKessner. Though, I have to ask: do you use mascara on your bottom lashes?

jippie

@angelatlarge but what video are you referring to then?

good morning

angelatlarge

3 hours ago, by David Kessner

@angelatlarge I like how this guy detected cats: http://www.youtube.com/watch?v=goZ2DqMnaGc

David Kessner

5:21 PM

@angelatlarge Sadly, yes. I lost those lashes in a freak MOSFET accident.

angelatlarge

@DavidKessner Did you try to look deeply into the soul of the ESD gun? Maybe to see if there was a blue light in there somewhere?

coding_corgi

@angelatlarge Hee hee hee....

@jippie MAKE IT! Your cats will love it....

angelatlarge

@coding_corgi It's for the neighbours' cats, I think. He wants to keep foreign cats out of his yard. There is an Israel/US joke in there somewhere, but @rawbrawb forbade politics on this forum.

coding_corgi

@angelatlarge Not for his? Darn....

David Kessner

@angelatlarge Its soul is black, too. :(

yogece

5:24 PM

@DavidKessner electronics.stackexchange.com/questions/71017/…

The Photon

@DavidKessner That is a ridiculously bad article.

Why would Saudi police expel someone from a different country?

angelatlarge

@DavidKessner Wow, Mr. T. would have never guessed that him and ESD gun are... soul mates?

David Kessner

@ThePhoton Yeah, I couldn't actually figure out who expelled whom in that article.

@angelatlarge They both spit out static, and the occasional inflammatory spark. But only one can be shut off and put back in a box when you're done with it/him.

2

angelatlarge

@DavidKessner NICE

coding_corgi

@angelatlarge <jk>Oh f*** you @rawbrawb! I love politics! :]</jk>

angelatlarge

5:27 PM

@DavidKessner That's because Mr. T thinks outside the box. As long as the box isn't labeled ESR.

David Kessner

@angelatlarge I thought he thinks outside the box, if by box you mean his own skull.

In other words, no brain is used in his thought process.

Lunch time. Be back in an hour or so...

coding_corgi

I am going to buy a Raspberry Pi this weekend!

Wanna get mine before they out of stock...

jippie

@angelatlarge interesting

jippie

6:08 PM

they all left after I came in @CamilStaps

user61389

@jippie oh, you here? Bye.

user61389

Did I miss anything good today? :)

jippie

@CamilStaps The cat video

49 mins ago, by angelatlarge

3 hours ago, by David Kessner

@angelatlarge I like how this guy detected cats: http://www.youtube.com/watch?v=goZ2DqMnaGc

coding_corgi

@jippie Yes, that was funny...

William 'MindWorX' Mariager

I've read that newly charged batteries can go above their normal voltage. Like a 24v battery might be 30v. What's the normal way to deal with that?

user61389

6:17 PM

@jippie this guy is great :)

jippie

@William'MindWorX'Mariager put a load on them?

@William'MindWorX'Mariager can you be more specific to what problem you want to solve?

William 'MindWorX' Mariager

I'd like to avoid frying things connected to the battery.

Like this: seeedstudio.com/depot/…

It's made to handle 12v-24v. I assume it'll take damage if I throw 30v at it.

jippie

@William'MindWorX'Mariager So what is the frying voltage? and what is the operating voltage?

@William'MindWorX'Mariager Why did you select a 24V battery?

William 'MindWorX' Mariager

It'll supply two 24 volt DC motors.

jippie

I would use a DC/DC switched mode converter that takes 30+ volt and regulate it down to 12V

@William'MindWorX'Mariager yes batteries do that, but 30V is a bit much I think. Never measured a 24V battery though.

The Photon

6:24 PM

@William'MindWorX'Mariager Choose parts that have "abs max" ratings well above the nominal voltage?

jippie

@angelatlarge nobody starred my 7th commandment :(

angelatlarge

@jippie Link?

jippie

@angelatlarge google for commandment site:chat.stackexchange.com

angelatlarge

@jippie Whaaaa? You are going to make me google something?

The Photon

@William'MindWorX'Mariager The specs for that part talk about an 8-35 V range for the input voltage. So 30 V should not damage it.

But the specs are not very clear --- a real datasheet would be helpful to know whether the range given is a normal operating range or an abs max range.

jippie

6:27 PM

@angelatlarge I'll repeat it for you

Commandment #7: All microcontrollers are equal, but some microcontrollers are more equal than others. (credits: George Orwell)

William 'MindWorX' Mariager

@ThePhoton, I didn't even notice the 8-35V range.

They're cheap though, so I might as well give it a go.

angelatlarge

@jippie 28 leg goooood. 27 legs baaaad.

W5VO

@jippie All Microcontrollers are equal, but the FP equality test code is bugged.

jippie

so would Snowball be PIC, AVR or ARM?

user61389

Someone said ~~PIC?~~ AVR? I'm out.

The Photon

6:31 PM

@William'MindWorX'Mariager If it's designed for automotive use (and the manufacturer name implies it is), it "should" be designed to handle variable battery voltage, high voltage when alternator is charging the battery, transient events, etc...But again a real datasheet would be nice to confirm that.

angelatlarge

@jippie That makes is obvious: Snowball is @CamilStaps

William 'MindWorX' Mariager

@ThePhoton, Yeah, I tried looking for a datasheet. Couldn't find any. But usage like "taxi advertising screen" seems to suggest what you're saying.

Someone just gave me five of these: instrumart.com/products/24329/tibbo-ds202r-device-server

Basically a networked RS232 seriel port.

Accepts 10-24 V. I guess all I need to do is translate it to TTL and I can use them with my arduino.

jippie

6:59 PM

@angelatlarge sure @CamilStaps is not Napoleon?

jippie

7:56 PM

@CamilStaps R U there?

user61389

@jippie yes, fully with my half arm

jippie

@CamilStaps half ar?

user61389

57 mins ago, by jippie

@angelatlarge sure @CamilStaps is not Napoleon?

jippie

@CamilStaps you mentioned the other day that you manage to automatically refesh a page in the browser every 15 seconds, right?

user61389

@jippie eh, yes

jippie

7:57 PM

Can you explain in a single sentence how you achieve that?

user61389

1

Q: Review Stalker user script

This is a very basic user script which does the following: Checks the Review homepage if there's anything you can review If so, it changes the title to (n) old_title where n is the number of review tasks you can perform If not, it refreshes the page in 15 seconds Install the script This i...

script user-script review

user61389

(It's in the window.setTimeout(function(){window.location = window.location;}, 15000);)

Transcript for