ccd camera projects ? where ?

ra

When they're out of date aren't they also at a resolution too low to compete with new modules?

On the other hand, do you think Cell Phone cameras will keep getting higher resolution endlessly?

Is there market demand for cell phone cameras to be 7 MegaPixels? Is 1.3 MegaPixels only a temporary plateau for phones?

Yes, you can build a cell phone with one.

Of course there is. That's why the latest phones have 8MP sensors.

Most have more than that.

Dave.

Best regards, Spehro Pefhany

--
"it\'s the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

You might consider using them together with a DVD-RW (the -R and +R have absorption bands in the red that place a nasty dark band in your view) to make a spectrophotometer on the cheap. They are made at .74um or about 1350 lines/mm, which is nice enough that I seem to be able to resolve out the yellow mercury pair at 577nm and 579nm. I've already built such a beast using hardboard paper for the box and internal baffling, as a hand-held unit with a slot on one side to drop in the disk and an exit rectangle for viewing by eye or using a camera. If you fix the structure well enough (use a shoebox, instead?), you might even be able to calibrate the pixels with a cheap merc-argon lamp (you'll first get the argon lines then as it warms up the mercury ones will take over) and have it "stay." I'd played around a bit with that, but am not yet satisfied. Intensity calibration will be a bit more difficult, though. But it's a lot of fun and there are quite a few opportunities for experimenting with ideas for improvement for various purposes. Plant fluorescence, absorption, and reflection, for example, are uses I've read about.

Jon

Many are already above 1.3MP, but there is a bit of a plateau in that the BOM price for a cell phone camera generally needs to be

Wow... that's more like a camera with a built-in phone rather than a phone with a built-in camera!

Without a detailed ID, I'm not searching the site. Others may, though. Hopefully, something interesting there for them, though.

Jon

Here is one of the better pages on this subject:

I found that some DVD-Rs can be mechanically (and violently if you like) split into two layers, allowing the "grating" to be on the newly-exposed surface rather than being buried. (The region with the pits is normally sandwiched between two fairly thick layers of plastic, unlike a CD.) This might help if there are problems from spurious reflections from the front surface.

Chris

Thanks, that's a nice look at a kind of cludgy, but performing system. I was VERY glad to see the nice yellow mercury doublet displayed on the page. Very nice.

(I'm not sure what to expect butchering my DVD like that. I'd worry about stress-defects being generated and although the entire DVD is a bit largish it is very nice to design a system [as I have here] where I can toss away one DVD and drop in another without a moment's effort involved. It's a rigid and precise arrangement without wobble or flexure pressures, yet I can remove the disk and replace it without much effort. However, I'm going to take a crack at that -- pun intended -- and see how that works out.)

Jon

Kirwan wrote

Something like "I'm too damn lazy to search the site"

This is for the OP MR Kirwan, not you:

Roberts

Actually, it's "I'm not willing to try reading your mind." Quite another thing.

But thanks for the clarification, anyway. That's what was needed in the first place.

--
It\'s WAY too expensive.  I can get, in 1\'s, 1.2Mpixel cameras in nice
boxes for $10 US each.  That\'s with an interface to an IBM PC to
download the data.  Not the way I\'d go, anyway.

Jon

The cogs camera above is 1.3 MP and the one you mentioned is 1.3 MP. Why is that level of resolution so popular for projects? Is it just that they're no longer bleeding edge technology with big price?

Got a link for those $10 quantity one cameras?

On a sunny day (Tue, 03 Feb 2009 01:18:03 GMT) it happened Jon Kirwan wrote in :

I have a CD or DVD ( forgot what it was) glued to the front of a PC, covering the harddisk slots. Here it shows the fluorescent light spectrum: ftp://panteltje.com/pub/fluorescent_light_spectrum_img_0874.jpg those are the narrow green and purple lines.

The wide strong green bands is the daylight, coming in through a window on the side. Thought it looked nice. No deeper analysis happened.

I use some of those DVDs (the coasters basically) as decoration too. The Canon A470 CCD (not CMOS) camera has no problem with the colors.

side.

You can actually do better than that with just a CD. At glancing incidence the CD behaves like a hologram of a slit and you can fairly easily see the more prominent Fraunhofer lines in the solar spectrum.

Details of the required geometry on Maurice Gavins page:

It is one of the better uses of shovelware CDs (aluminium coated ones).

If they are going to go wrong at all in colour rendition it will probably be along the line of purples. Flesh tones have to be right. Early digital cameras had quirky response to monochromatic light. My first Kodak DC-120 was freaked out by a pure monochromatic red narroband H-alpha image. I think it relied on the green channel to determine the automatic exposure.

NB colour film has a dead spot in the mid green OIII emission line which is why old photos of nebulas are pink and blue on photographs but green to the visual observer with a big enough scope.

Regards, Martin Brown

st place.

Do you love threadjacking or what?

Is your name Crawczuk? Do you read,or do you just skim the titles.?

The original poster, Mr Crawczuk asked for data to interface to a

22T1 or similar. The Sparkfun page had a link to the data sheet as well as the 109$ dev kit. From the links on the Sparkfun page he could find enough freeware and data sheets to get him started, as well as chat groups and forums on the camera use. The 109$ price is for the readout board, not the 10$ camera. While I will admit $109 is high priced for a development kit, the data there would save Mr Crawczuk a lot of time.

Now why don't you go over to TAOS and get your self a linear CCD demo kit for your grating project and build a real interface for it.

Roberts

On a sunny day (Tue, 03 Feb 2009 14:09:56 +0000) it happened Martin Brown wrote in :

the side.

Nice, bookmarked it :-)

Yeah. It's about the minimum size being made at some point. I think they literally grind these things up into powder just to keep the market stronger for newer products, but some of them leak through as blister-packs going for near-nothing sold as impulse items.

I did, but I'll have to find another one as that sale is off -- it was more than a month ago. If I get a chance to re-look again, I'll post one for you. Won't be today as I've a very long day at the college.

The reason I looked is that I'm trying to get younger students interested in trying their hand at interesting, but cheap instruments that can be fun to use. And I needed to play with some ideas that wouldn't cost much. $10 is sometimes doable for families to consider. Much more is certainly not. A DVD isn't too much to ask and they don't have to pay for the $8 merc-argon bulb if they don't want to as they can borrow one for the purpose. Card stock is pretty cheap, too.

Jon