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946  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: How to hire someone to build an Arduino project? on: December 15, 2010, 03:59:48 pm
Just keep in mind that most here are hobbyists and quite a large number are students.  That's not to say that you can't collaborate, but you should keep in mind that you'll be working with someone that may not be used to budgets and timelines and deliverables to clients.  You may need to carry more of that side of the equation for someone that's prototyping for you.  Just be careful, in that an amateur with the best of intents may very well underestimate costs and timelines.. and you'd want to be sure to discuss it thoroughly to make sure you're not swinging in the breeze when it comes time to deliver the product.  That all being said, there's a lot of professionals here also, with extensive project-management experience.. but they probably wouldn't come cheap.

Our little Arduinos are great for what you're proposing in most cases, and most here could even steer you to a more suitable solution if Arduino isn't the answer for a particular problem, and could very well deliver what you want for a lot less effort and cost than other solutions.. just take care in what you promise to a customer if the engineering end is not necessarily up to a pro level.

Many here are always looking for a bit of pocket change, anytime (including me!)
947  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino USB Storage on: December 10, 2010, 11:13:11 am
Stupid question.. why not use an Arduino?

Use a mini, and have your PC-side "programmer" simply be AVRdude in a pretty dress?  (okay, let's not EVER use that slang in relation to AVRdude again.  It's just...not right.)

Your PC side app downloads your executable directly to the arduino, which is then carried over and plugged into the remaining hardware.  On both sides, you have power, so your "key" needs no internal battery or whatever.  This is a lot simpler (and therefore cheaper as well as more likely to work) than trying to implement on hacked-together SD card interfaces.  All your user sees on one side is the PC-side USB, and you can purchase pretty much any type of connector for the "other end" which plugs into your device.  Instead of moving just the data, move the whole computer (the Arduino, that is), and it becomes easier.

Seems that you are trying to bring the mountain to Mohammed, so to speak.  Arduino minis are just about the right size to be made into a keyfob sized device.. so what you really need is a connector, and some creative code.  Don't take the data to the arduino, take the arduino to the data.  Just my take on one way to approach the problem.. with mini's being in the $20 range even in single units, it makes sense.  It also allows you to completely update the firmware of your device at any time, adding features or fixing problems.

Good luck smiley
948  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Arduino Duemilanove How to trigger the camera? on: December 09, 2010, 03:56:19 pm
You aren't likely to be able to PTP (usb protocol), but you can use the shutter release on your Canon.. it's a simple 2.5mm stereo plug; for your 5d you can use infrared but I've not done that myself.

For the circuit and a little background, you can check out "High speed water droplet photography" or "camera Axe" here in these forums, I've also written on it in my blog:

It's actually a quite simple project, but I will recommend that you do use an optoisolator when connecting to your (very expensive) camera body to help prevent damage if you make any unfortunate mistakes.

In terms of a trigger circuit, I'd use a phototransistor and a laser possibly... but read up on the water droplet photography another user has been doing here, in the exhibition forum- he's had a lot of success, so I'd take a good look at what he's done..
949  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Newcomer to Arduino. Point me in right direction? on: November 07, 2010, 03:22:42 pm
Well, torque is usually expressed as an ability to move a weight a certain distance.  In Imperial units, that's foot/pounds, metric it's Newtons (kg/m, yes?).  You are basically going to have to determine about how much force you will need.. and the movement above assumes that you are working against gravity, vertically.. so if you need to move two pounds, you don't necessarily need two foot/pounds of force.  You just need enough to overcome friction and inertia.  Also, speed works into this... a geared motor might produce a lot of torque, but turn to slowly to be useful for example.

You are going to need to browse some physics texts to get it exact.. otherwise, I'd suggest looking for motors that are being marketed for robotics use, for roughly the same use, and taking a look at those specs.. RPM, Torque, and Current draw. RPM is how fast, and current draw is how much power it's going to use doing it.  Find roughly the specs you need, then try to get as close to those as you can afford.

Typically, a good resource might be a good R/C car and plane hobby shop- they frequently can help a lot in these kinds of things...
950  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: New to Arduino on: November 07, 2010, 08:12:51 pm
Order what you need off Ebay.  It'll take a little bit to get there if from China, but you'll get great prices.. just got 300 LED's (100 each red, green, white) for $12.  

Just don't shop Radio Shack.. you'll go broke!
951  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: IR-LED as heat source on: October 17, 2010, 04:21:55 pm
Infrared lighting a Fornicarium?  Sounds like hidden-camera porn to me..
952  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: PIC or AVR? noobie question(s) on: October 13, 2010, 05:11:41 pm
I still have not picked up an "actual" Arduino at this point.. I use an Adafruit BoArduino- a minimal design that is set for plugging directly into a standard breadboard... the USB connectivity stays in the cable, further reducing cost.  I think they go for around $15..  even cheaper is the Anarduino, which even skips the voltage regulator.. runs about $10.. and there's even some goof that just piggybacked the resonator and such directly on the back of the 328.. can't get more basic..

For me, the site and general feel of the project is what makes it superior to PIC.  Hardware on both sides will be roughly equal, give or take- so it comes down to usability and support... and on that, Arduino is the winner, IMO.  Even other "generic" AVR-related sites don't have the community that seems to have grown here.. some places can be a little unfriendly to new people and/or "silly" questions..
953  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Noob question on: October 13, 2010, 04:54:35 pm
Well a short might draw a bunch of current, you might fry the traces off the board if you tried to pull enough through them.  I think it's pretty unlikely that anything more than the LED fried- you weren't sourcing or sinking to a microcontroller pin, so the current draw at best might hurt the power supply - and at a short duration, you'll probably get lucky.  If you did fry the regulator, a 7805 regulator only costs a buck or so and can be replaced pretty easily.

I wouldn't make a habit of it though.. (this, coming from me?)
954  Forum 2005-2010 (read only) / Bar Sport / Re: I'm New To The Arduino Fourms :) on: January 10, 2011, 08:10:32 am
The main reason you really need to use resistors is of course to  support "The Resistance".  Those courageous Resistors are out there, giving their all, for you.  I saw all about it in a film, black and white- must have been carbon. 

Vive Le Electron!
955  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: December 26, 2010, 01:16:23 pm
Osgeld-  Canon makes a pretty good printer for the price.  They may not be vry fast but they do have nice image quality.  If you're printing a 100-page document, go get some coffee-- but if what you want is ten pages, with half of them full of color graphics- the Canon will do quite nicely.  Not used their WiFi versions, but I've been a fan of the Canons for their price/image quality.  Note that the inks sometimes take a few minutes to completely dry into their final colors though- particularly skintones can look VERY red until fully dry...
956  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: December 12, 2010, 10:56:43 pm

First shot:  Rovio, monitor showing webpage with streaming video from it.

Second shot: Stunning self-portrait taken with the Rovio via it's onboard WiFi Web interface, with streaming video and audio.  It would be drivng about the room if it had a battery that kept it going off the base.  Right now it starts off...and then has no power since it disconnects from its base.  At the time I took the shot, it was running proxied through my firewall, that shot (even though on desk a foot or so away) was taken via the web.  Sweet.

The camera raises and lowers, shoots video and stills, LED headlamp is a bit lame and I need to read up on IR LIDAR system it supposedly has.  Score one for junk stores!

Turns out a battery connector/wire needed a touch of solder, it looks like- but since I'll be rigging a battery of my own, no love lost.  The original spec is something like 3000mAH @ 6v, pretty sure I can come up with something creative in that range or better.  I won't be able to test out the navigation and drive train until it's got a mobile power source.  

957  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: December 12, 2010, 06:16:20 pm

For The Win:

A WowWee Rovio "Mobile Webcam" from a surplus and return joint... box is busted, parts may be missing.. I'm assuming it's broken, but for parts alone it's a dream come true.  It's a WiFi enabled mobile platform with a VGA color camera.. infrared navigation system.. web-controllable, even self-charge Lithium battery.  If even half the parts work, it's the buy of the year, for me.  This thing is a hardware geek's dream... and since I got it for cheap money (instead of the $149 it costs!), I feel no remorse in tearing it apart if that is it's destiny.


The kicker..... FIVE BUCKS.  

>>> FTW <<<

(NOTE:  After unboxing and testing, it is FULLY functional, only missing it's battery.  Camera, platform, WiFi all functional!)
958  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: November 11, 2010, 11:37:13 am
Brannigan's Law.

That being said, you are right Crossroads... Futurama is copyrighted, wouldn't want to show kids it's okay to violate intellectual property restrictions...

Otherwise, well within international interrogation treaties, unless Barney was on, which then would place it in a War Crimes category.  I agree totally with the situation, she may have vital knowledge of national security importance.  Obviously, she's an Undercover(s) agent.

Keeping America Safe, One Hottie At A Time (tm).
959  Forum 2005-2010 (read only) / Bar Sport / Re: Your last purchase? on: November 06, 2010, 05:07:07 pm
After becoming a confirmed addict with my first- an Adafruit BoArduino- my son has grown interested in my little projects, at fifteen he's capable of handling the language and hardware with a little help.  So..

2x Arduino (Real ones.. though I *love* the adafruit, I feel I should own at least ONE of the real thing.  Mega sometime down the road.  Oh yeah, and one for my son too...), as well as breadboard, jumper sets, 400 LED's of various color ($5 per hundred.. what's not to love), resistor assortment, 2x 16x2 LCD, and some assorted other basics.  Amazing what you can get these days for short money-- and these are shipping from Canada and Cali- a lot better than Hong Kong.....

In short, everything required for him to become a junkie too.. ;D
960  Forum 2005-2010 (read only) / Bar Sport / Re: How much soldering should one do per day? on: January 06, 2011, 04:08:45 pm
I take 'roids to enhance my soldering performance.   Now every idiot that wants to look trendy wears a stupid rubber wristband that says "Rosin Strong".

I for one picked up soldering and Arduino so as to look useful to our (coming, and not a moment too soon) Robot Overlords.  Riding a bike only impresses Al Gore.  The robots will give me wealth and dominion over thousands.  

However, this new ROHS Lead-free solder might be better than the 60/40 we used back in the day- it must have been imported from China.  No matter how much of the old stuff you ate, you were still hungry again in an hour. (twitch) (twitch)

Or, combine the two.  "Flux Armstrong" - Now I really am showing my age
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