Not the first and not the last. I was bored tonight.
I took cues from a few different places. The FDTI cable is connected funny because I don't have any extra long male headers right now.
Blink sketch, etc. Auto reset, etc.
Before someone says anything, that green LED lacks a resistor because it has an internal resistor (designed for 5V operation).
I did this because I plan to make a permanent custom Arduino on some soldering protoboards.
Only problem I had was switching TX and RX and subsequently having major issues, but I eventually figured that out. (Careful, this mistake caused some heating in my case.)
I'm posting this hoping it will be useful to someone.
You've got a circuit and partlist somewhere?
I suppose I could throw something together.
1 - ATMEGA328p/168 (28-pin DIP package)
3 - 0.1uf capactitor
2 - 10k resistor
1 - 1k resistor
1 - Tactile pushbutton switch (Normally Open)
1 - 16MHz ceramic resonator
2 - LEDs of your choice for pin 13 and pilot light
1 - Jumper wire kit or 22 guage solid wire
1 - FDTI breakout or FTDI cable
As for schematic, I don't have any suitable software right now, but I'll offer this:
I copied most of this design:
Though available everywhere, I made sure I wired up the auto-reset trick properly with ladyada's Boarduino schematic:
For the FDTI breakout:
GND goes to the ground bus you chose on the breadboard/protoboard.
+5V goes to the +5V power bus you chose on the breadboard/protoboard.
TX goes to pin 2 of the ATMEGA through a 10k resistor.
RX goes to pin 3.
Auto-reset functionalityh is accomplished by connecting the green wire of the FDTI cable (opposite the black ground wire), also labeled RTS by ladyada, to pin 1 through a 0.1uf capacitor.
I did not put a power supply on that version because I was just testing it. I'd just use an LM2940 or 7805 regulator and some capacitors. A 1N4001 protection diode and PTC would be good too, but I don't have any PTCs. The pictured circuit would not be pleased if you reversed the power supply, so at least a 1N4001 would be needed.
(Cathode to the VCC/+5V bus, anode to the GND bus)