So this is kind of a simple-minded project and I'd be surprised if it was an original idea, but I thought I'd show how I used EMS' "fine DIY and open source hardware" to make a simple Arduino clone. Just a fun little project that can be tossed together in about an hour.
On the other hand, a person could just go with EMS' Diavolino kit. At $13, it could well be cheaper than the target board approach, especially if you don't have the incidental components laying around as I did. And the Diavolino also has the Arduino form factor. So it depends what you want. The target board approach has more of a DIY flavor as opposed to a kit.
C1,2 18pF ceramic, or as needed to match crystal*
C3-6 100nF ceramic
C7 10uF 16V electrolytic
J1 2x3 ICSP HEADER
J2 6x1 FTDI HEADER
LED1 Red garden-variety (Pin 13 LED)
LED2 Green garden-variety (Power LED)
S1 SPST MC NO Tact switch
n/a ZIF or other 28-pin DIL socket
n/a Evil Mad Science ATmegaXX8 Target Board
*EMS sells a 16MHz Crystal and Capacitor Set, which is what I used, but of course they could also be purchased individually, or a resonator could be used instead.
|Arduino-compatible built on EMS target board|
|Action shot ;-)|