I am still trying to figure this out and I know some out there has asked this same question with different words, but can I build a prototype on my uno r3 and then build for real off just the chip and (i assume we need) a crystal?
I found this http://www.hobbytronics.co.uk/image/data/tutorial/arduino-hardcore/atmega328-arduino-pinout.jpg
and it looks like the start to my question but i want to know things like:
can i still have a reset button?
What are pins 20 21 & 22 (ARef)?
I have never seen a chip with power not on the corners but i am to believe that +5v is on pin 7 and ground is 8?
What is the voltage tolerance?
Should i even ask what SPI (pins 17,18&19)& I2
thanks for the support in advance!