[sdiy] request for help re arduino module pcb

[Paul Anderson]

On 27-Jul-09, at 1:54 PM, Jason Proctor wrote:

> hey all,
>
> i'd like to turn the arduino module design into a PCB for all to  
> share, but i don't know any design applications and with my schedule  
> being the way it is i'm not going to get time to do so anytime soon.
>


It can be dramatically simplified if you wish, as well.  There's logic  
on the arduino for selecting power source, and ancillary parts for the  
FT232R chip.  You can buy a cable from FTDI that has TTL outputs and  
an FT232 inside it, obviating the need for the chip itself on the  
final board.  The arduino uses a 16MHz crystal, there's a couple  
options there.  You can configure the AVR chip to use it's internal RC  
oscillator, a crystal or a ceramic resonator.  Digi-key has 20MHz  
ceramic resonators that include the appropriate loading capacitors in  
the package.

Aside from prototyping, I've moved to using the AVR chip directly.  I  
keep a tube of ATtiny45's around.  They're a little 8-pin  
microcontroller, and sell for about $1.50.  I set them up for RC  
oscillator, and use a USBtinyISP programmer to program it.  Just apply  
power and she runs, easy as can be.

---
Paul Anderson
wackyvorlon at gmail.com
http://www.andersonloco.com