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[on:]

Hello,

I've designed an Arduino compatible board that can be easily build with throught hole components. It uses an modyfied version of avr-cdc.

- Can run at 5V or 3,3V (selectable with a switch).
- jumper for driving it competely over USB.
- uses avr-cdc for USB to TTL (modified version that gives you autoreset).
- uses an attiny2313 (avr-cdc) and an atmega328p (optiboot).
- runs with 19200 baud.

It is currently work in progress, but i would like to get some constructive feedbacks from you :-) 

You can find the current state of the project on my Blog:

http://www.cmdrkeen.net/2012/09/11/building-the-keenduino-ghettoino-rev-2/

I'm happy to see some comments :-)

[Reply #1 on:]

I like the concept --  very "back to basics" idea, hole through parts and all.

I think you could actually split this into three stages, building it up:

Stage 1: No USB/Attiny, no power regulation. Basically just 328p and crystal. Program via ICSP, or USB->TTY board.
            Bring your own regulated power supply at 3.3 or 5.0V.
Stage 2: Add power regulation, but still have to program by ICSP or USB->TTY board.
Stage 3: Add USB/Attiny, can now program by ICSP, USN->TTY board, or USB.

Good work! 3.3V is a nice option.

[Reply #2 on:]

Hello pico, thank you for your feedback :-)

yep, it's a very good idea to offer also a basic design, it would give newcommers a better understanding of what is essential for an arduino board.
There are plans for an ICSP port (because it is simply a must have). but sadly i didn't had the time to add it, but it is planned for the first update.

my plan is to make a pinout for the attiny2313 too and connect both to the ICSP port, so you have the abillity to reprogram both MCU's.

[Reply #3 on:]

The other thing that would complement your design nicely is a small pcb layout, perhaps one that could be made to fit the size limits of the inexpensive "10 boards for $10" pcb board makers (itead/seeed etc.) Just a thought, if things could be made to fit. That would be a pretty slick "DIY Arduino" project, then, I think.