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Hello all,

I would like to build a small DIP board with as minimum on components as possible.

It would be nice to use them as a workshop for children +12 yrs

This is a nice way to teach them the basics of soldering / programming and construction.

Why the DIP version: because it is easy to change the chip and get them started on a new project maybe I leave the chip on the PCB and use as Arduino Pro style board.
The minimal 18F2550 through-hole-part (ignoring the SMD nano switch) PCB at http://www.valpoder.com/?p=348 is, well, pretty minimal. The maker posts from France - I've recently successfully assembled his minimal 2550 SMD PCB.
I'd consider using breadboards (small ones starting from 2~3 Euro) plus firm, solid core (non-litz) wire (with easily removable plastic isolation) on reels together with pretty cheap DIP 18F45K50 or 25K50, which require neither crystal nor voltage regulation, running directly from USB 5V. So almost everything would be reusable. There should be plenty room for soldering e.g. multi-pin connector/strips, adapters a.s.o.

Find cheap breadboards here:

http://www.pollin.de/shop/suchergebnis.h...teckboards

http://www.pollin.de/shop/dt/MDM2OTg0OTk...YB_46.html

http://www.pollin.de/shop/dt/NTI4OTg0OTk...board.html
Thank you for your replies.

I made a small test pcb design to see how small it can be with conventional parts.

Even fitted a chunky USB B on it. The small pins from the micro B are a bit to small for children to solder them.

Maybe a nice board to distribute later on. It can be a nice priced little board.

Gerard
First sketch to get started.

Opted for the external oscillator though.

Gerard