[sdiy] GorF Update

[Neil Johnson]

Paul,

Paul Maddox wrote:
> I've uploaded the schematics for GorF, and explained some of the  
> extra bits on there ;-
> http://blog.vacoloco.com/?p=125


Excellent progress!

On your comment about the size of the ISP connector, I've  
standardised on a small 1.25mm pitch Molex connector as a mini-ISP  
connector:

http://www.rapidonline.com/Cables-Connectors/Connectors-Multipole/PCB- 
Interconnect/1.25mm-Wire-to-board-headers/72355/kw/22-3934

The crimps are very tiny, so I wimped out and bought a pack of ten  
ready-crimped leads from Farnell.

I use the same pinout as the standard AVR 6-pin connector:

1 - MISO
2 - VCC
3 - CLK
4 - MOSI
5 - RESET\
6 - GND

and the standard 10-way IDC header at the other end into which the  
programming cable plugs in.

> As much as I like Eagle, I find the the 100mm by 80mm board size  
> limit really annoying. And yes there's the "non profit" version  
> which gives 160mm by 100mm and whilst that would be fine for GorF  
> the other projects I'm working on require a board length of around  
> 240mm by 100mm. and I certainly can't afford the 1200UKP for the  
> full version of the software. It's a crying shame there's nothing  
> in between the 160mm and 'anysize' limits, in terms of cost (The  
> standard version only offers 160mm by 100mm board size limit).

I'm moving to surface-mount for larger projects, with components on  
both sides.  In this way I can squeeze even more into 100mm x 80mm :)

At the very least, Paul, if you used a TQFP for the AVR (and perhaps  
all those resistors) you'd free up a lot of space.

Cheers,
Neil
--
http://www.njohnson.co.uk