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31  Using Arduino / Project Guidance / Re: Video capture ! Possible? on: February 22, 2013, 02:47:50 pm
Isn't it about time we had an "Arduino and Video - Crushing your expectations" sticky thread? smiley-wink
32  Topics / Device Hacking / Re: Using screen from IPad3 on: February 18, 2013, 01:32:26 pm

Sell the LCD to someone that can use it for it's intended purpose.

// Per.

...and use the money to buy a more suitable display for your Mega smiley-grin There are some reasonably good serial TFT displays out there for not a lot of money, but you're never going to drive a tablet display without comparable hardware.

When thinking about a project plan, ask yourself if it's been done before, and if not - why not! Technical limitations get in the way of a lot of good ideas. Or at least, they do for me!
33  Using Arduino / Project Guidance / Re: Diode Guidance on: February 18, 2013, 12:38:40 pm
You might want to consider a 5V voltage regulator with built-in protection circuitry, and forget the diode.
34  Using Arduino / General Electronics / Re: What transistors have around a 2-3v turn on on: February 18, 2013, 12:36:25 pm
Quote
should campasistors be used too

I don't think campasistors are due to be invented until sometime next decade.  smiley-wink

Lefty

I dunno... some of the tropical fish caps look pretty camp to me smiley-wink FABULOUS colours.
35  Using Arduino / General Electronics / Re: Component identify & simplify. on: February 18, 2013, 12:17:10 pm
It's an inductor. You can get them from more or less anywhere... farnell might be a good bet in the UK smiley
36  Using Arduino / Project Guidance / Re: AC for running the transformer on: February 14, 2013, 04:28:08 pm
Did you look for other examples to check where you might have gone wrong? 555 circuits are one of the first things anyone should learn about. Using two 100ohm resistors and a 200nf cap will give you 24khz at 66% duty cycle. I find that with a suitable transistor to drive the primary winding it works quite well.

It's not really AC you need anyway, more like pulses of DC. You want to get the transformer core to store as much energy as possible then collapse the magnetic field as quickly as possible so you get nice big spikes of voltage for your arcs and sparks!
37  Using Arduino / Project Guidance / Re: AC for running the transformer on: February 14, 2013, 03:04:56 pm
Have a 230V to 11V transformer. Want to run it to have a spark gap.
First thought creating an Sine Wave would be easy with arduino but apparently not that easy.

Just a couple of thoughts here... first, don't use "normal" transformers this way. They're not very good at it. If you want a spark gap, use a high-frequency ferrite core transformer, like the baby flybacks you find in plasma globes. You may get a painful shock/small burn if you're not careful, but you're quite unlikely to die unless you decide to experiment with it naked covered in salt water.... so don't do that :p

Also, don't throw a microcontroller at a project that doesn't need one. It'd be easy enough to knock together a 555-based oscillator with some big fat power transistors to make an appropriate driver circuit, and a lot less hassle if you burn something out. Google "flyback driver 555" for some ideas, it's not difficult. You can vary the output voltage by varying the duty cycle of the 555 oscillator.
38  Using Arduino / Programming Questions / Re: cruise control on motorcycle, need to read timing between wheel RPMs on reed swi on: February 13, 2013, 01:57:36 pm
Not knowing what the bike is I can't be sure, but if something brown DID hit the fan, couldn't you just click off the kill switch and roll yourself to a gentle stop?
39  Community / Bar Sport / Re: How do you misuse sticky tape? on: February 12, 2013, 04:30:25 pm
I once witnessed some fantastic misuse of sticky tape at my work... a colleague from the production department used some double sided tape to attach his iPhone to the desk to stop it moving around (don't ask me what goes through that boy's head). All went well, work was done, tunes were listened to and nothing fell on the floor.

But when it came time to remove the phone from it's moorings, the tape turned out to have much more grab than expected and completely shattered the glass back-panel. I expect he'll make management grade one day with problem solving skills like that smiley
40  Using Arduino / Project Guidance / Re: DIGITAL CLOCK on: February 11, 2013, 03:37:48 pm
Your code's going to need some serious alteration, once you're able smiley As it stands, what you're doing could easily be accomplished with a handful of logic ICs. You could throw together a counter-upper-thingy in an couple of hours with no need to write any code at all!

41  Using Arduino / General Electronics / Re: Agilent has oscilloscopes to 63 GHz /160GS/s. How is that possible? on: February 06, 2013, 12:43:01 pm
Based on EEVblog tear-downs I've watched, I think the answer is "dark sorcery and witchcraft" smiley-grin
42  Using Arduino / General Electronics / Re: 4 digit LED serial display on: February 06, 2013, 12:41:26 pm
This does not sound like a "serial" display, you might want to check out these:
https://www.sparkfun.com/products/11441

which you control by sending ASCII characters down the serial line.

I'm not sure what you mean there, they sound EXACTLY like serial displays to me. A 3-wire serial interface is a very common way of driving lots of digits and I've had good success with things like that using the ShiftOut function. Those sparkfun things are crap anyway. I bought one once, never again.
43  Using Arduino / Project Guidance / Re: AV transmitter 720p h.264 on: February 05, 2013, 02:35:14 pm
Not by a long-shot. In pieces of equipment I've pulled to bits, I've often seen "arduino"-spec microcontrollers doing things like driving LCD/LED/VFD displays and reading pushbuttons, knobs and encoders (of the rotary kind), but for all the actual work, they use whopping great ICs designed especially for the purpose in mind... and they're rarely prototype-friendly.
44  Using Arduino / Project Guidance / Re: AV transmitter 720p h.264 on: February 05, 2013, 12:34:24 pm
In a word, no. Unless the arduino's only role is processing user control input, like buttons and knobs or whatever, and passing them on to something else. If you want it to do any of the video stuff you're talking about, you're out of luck.
45  Using Arduino / General Electronics / Re: Small power source for one century on: January 27, 2013, 03:46:44 pm
John, that is actually an awesome idea smiley-razz Crowdsourced power. The one thing you won't run out of in the next hundred years is curious people.
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