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Awesome project! It would be great if you had links to as many items you used as you can though. I'm wondering in particular what is the exact camera/transmitter/screen you used?
You know, I pretty much based this tutorial off of another tutorial I found so I just did what they did. Now that I know a little bit more about this chip though, I think you bring up a good point. You may be able to omit connecting 5V to pin 21 depending on what you're doing. I suppose you could try not connecting it and see if something doesn't work. If everything is OK, then don't worry about it.If you're working with analog components and need a 5V (or other voltage) reference, then you would hook it up. I experimented with it a little bit a couple years ago. I would just do a Google search on Arduino (or ATMega329) AREF.
I have no idea about using multiple microcontrollers together. However, you should do a Google search about Arduino and charlieplexing - charlieplexing allows you to control more things (like LEDs) than what you have pins available for. It may be a solution for you.
I'm not sure about what your question is...
Hi RyanKranz,This circuit isn't to (re)program the MCU. It is meant to allow your MCU to run it's program *after* uploading your code from the Arduino IDE...without an entire Arduino board such as the Duemilanove/Uno/etc. You need to add extra hardware to this circuit to be able to upload code to it. Or you can pull the chip and pop it in a Duemilanove/Uno/etc to upload your code then put it back on this circuit.
I'm sorry AbduA6, but I'm not sure what you're asking...
Excellent Instructable, thank you for creating/posting it!
I haven't had to so far...Thanks for reading!