I am trying to build a standalone with an atmega 2560.
QuoteI am trying to build a standalone with an atmega 2560.How to do it depends on what you want.The simplest implementation requires the chip itself. and that's it.Bells and whistles can be added but whether they should be depends on your applications.
I would put the chip on a breakout board, I think this onehttp://www.schmartboard.com/index.asp?page=products_qfp&id=70And add 16 MHz xtal, two 22 pf caps, 10K pullup resistor for reset, 4-6 100nF caps on the Vcc, AVCC, Aref, and reset pin to bring out as DTR signal.Connect 6 pins for ICSP - +5,GND, Reset, MISO, MOSI, SCK - and program away.
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