I have been reading about the atmega328 family and now I am more confused about this than before.
I will be using a standalone atmega328p-au, where p stands for picopower (less power consumption), and au stands for tqfp. I hope I am correct so far?
I need to burn the arduino bootloader on the blank chip, because I need to be able to upload the code whenever necessary. Once the bootloader is burnt on the chip I will only have (direct) access to Rx, Tx, Vcc, Vgnd and RST pins.
I need some advice on how to burn the bootloader (and upload sketches) using this method: http://arduino.cc/en/Tutorial/ArduinoToBreadboard
Since the Uno atmega328p-pu (28 pins) is different from atmega328p-au (32 pins), will it be possible to use the optiboot bootloader? Do the two chips have different signatures? Arduino Nano v3.0 has the same chip I will be using. So I can just select Arduino Nano board to burn the bootloader using the same method?
I have seen some vague answers on this topic, but did not find any straightforward answer.
Thank you for your help and best regards,