/diy/ - Do It Yourself

>>121233
>You used most of your processing power on that, right?
Well, surprisingly not :) There is this thing called DMA (Direct memory access), embedded in most 32-bit microcontroller newer than 2005 which make all of it possible.

The bottleneck would be:
Storing the data in non-volatile memory (micro-sd would be the most used thing in embedded) which down the capture rate to about 0.5 to 10 fps (depend on your processor SDIO module capabilities).
OR
Showing your picture in LCD which bugged down your capture rate to about 5 fps.

This would be a good start to watch what 72 MHz ARM capable of (not a product I have btw):
http://www.youtube.com/watch?v=mSUoOcNYQkU&feature=player_embedded

>>104661
Metallurgy time! (read a good book this weekend on it)

Iron and carbon goes through phases (like water has liquid, solid, and gas), some of which are soft and some of which are hard. Most steel is shipped in its soft phase so it's easy to work. There's three kinds of iron you care about; ferrite with carbides (soft pure iron with floating bits of carbon), austenite (hot iron with carbon atoms inside the atomic structure), and martensite (cold iron with an atomic structure much like austenite's). All three can be made from the same piece of steel.

When you heat steel past about 780C, the soft structure of ferrite starts to loosen up and get bigger, turning into austenite, and the small carbon atoms from the carbides rushes into the gaps between the big iron atoms. At 815C or so, depending on the steel, the ferrite should be fully transformed.

If you cool it back down slowly (in the air), the carbon atoms get squeeze back out of the austenite and turn back into carbides as the austenite becomes ferrite again. BUT, if you cool it down quickly (plunging it into water), the austenite atomic structures clamp down on the carbon, trapping it- and in turn the austenite structure gets "stuck" in the more open state, even though it's cool and it should be ferrite. This is martensite.

Martensite is hard but brittle (Rockwell 50-60), ferrite is soft but ductile (30-40).

Shop where a business would shop. A commercial t-shirt screenprinter does not pick up their shirts from walmart, they order them by the case from Importer/Distributors like SanMar, Broder, Alpha or a whole host of others.

If you are in a larger city or the metro-area of several large cities there should be several to choose from nearby. Not everyone will deal with non-commercial buyers and be prepared to buy at least 72 (common case amount) in some situations. Call around.

Unless you handle a Lot of shipping, consider picking up for yourself too. Tshirts get pricey when you start shipping them around, even at freight rates (which you will not get)