http://img191.imageshack.us/i/arduinoschematic.jpg/ , however they are also applying voltage to the AREF pin, sometimes direct, and sometimes through a resistor. Is this necessary or not? I've never used the aref pin on my duemilanove for anything.]
Also, some are not using a pull resistor on pin 1 reset, and others are. Is the resistor pretty important, or not really?]
And I don't get why, if the voltage regulator can by made with just the chip and 2 capacitors, why is the rbbb kit (and others) using 3 capacitors, and a diode? (plus an led, but I understand the point of that).]
All the info just varies so greatly from different sources.I hate asking so many questions, but I'm just baffled by how hard of a time I've been having finding this basic info. I've searched for "minimal", "standalone", " bare minimum", and others, and read at least 50 pages of so called minimum arduinos, and none of them are minimum. They all have tons of extra parts for programming, and generally are pretty full fledged programmable arduinos. I mean, thats good for a diy arduino that you can work on, and those are very cool. But if you already have a working project with all the bugs worked out, then it shouldn't need any extra programming. If you want to make it permanent, or make multiple permanent copies of it to give to family, or other situations like that then there is no point in wasting time and components, using anything more than the bare minimum components, and minimum connections. Seems like something 95% of the arduino users would want to do this. Make permanent minimal installations of successful projects. Yet info such as a simple accurate schematic of the bare minimum for a stable working chip, without anything extra, has been near impossible to find.
you don't have to power the AVcc and ground, just the one side Vcc and ground.
Quoteyou don't have to power the AVcc and ground, just the one side Vcc and ground.This is WRONG. If a chip has multiple ground and power pins, they should ALL be connected to the appropriate supply rails. Otherwise you get (by definition) undefined behavior. Some things may work, others may not. There may or may not be an internal connection on the chip that is sufficiently low-resistance to insure proper operation of the other parts of the chip...The diode prevents you from destroying the chip if you happen to plug in a wall-wart with the wrong polarity.The capacitors each serve slightly different purposes; they may or may not make each other unnecessary. The regulator should have input and output caps (already discussed), and the AVR should have a "bypass cap" for each power pin. (missing bypass caps were one of the problems I noticed in your schematic.)
what of these bypass caps you speak of? I never saw them on other's schematics
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