UBW (USB Bit Whacker)

[Arkham00]

I've seen the famous UBW project (**broken link removed**), a simple development environment for 18F PICs. The site has 5 different versions of the board/schematic with an easy-to-use 28 pin DIP package.

Do you know if (and where) it's possible to buy just the PCBs of some of the 5 versions? The only way I know is to buy a complete kit, assembled or not, from SparkFun (here).

I'd like to build some boards but most of the board revisions need double face PCB with holes metallization ... to complex for DIY.

 

[3v0]

If you do not mind having the PCB abut 1/4-1/2 inch longer I can make is single sided for you.

 

[Arkham00]

Thank you, 3V0. You are very kind and I'll contact you directly to arrange the thing.
But ... don't you really know anyone who builds and sells boards (maybe on eBay or similar) for this interesting project apart from the sparkfun kit?
Did you build all your UBWs "by hand" in single side?

 

[3v0]

I have only built ones that had application specific changes.

I enjoy this sort of thing and so making this for you is not a big deal.

This is a rough layout. The red top layer is to be replaced with jumpes. If you feel you can etch and build it I will clean it up and fix the clearances. There are a few lines between traces and one jumper under the PIC.

EDIT: uploaded better image.

 

[3v0]

Another option. The required PCB files can be downloaded from the UBW website. You could have a professional PCB board house make them for you.

I would be happy to finish the SS layout if you wish (no charge ) if you want to etch them yourself.

3v0

 

[Arkham00]

Thank you, 3V0. I'd be glad to try etching your SS board, when you'll finish it.
I never tried toner transfer technique but this is the right moment to try it .

Have a nice 2009.

 

[3v0]

Sounds good. Give me 24 hours.

 

[Analog2008]

USB Design using PIC18F

Check the following article:

**broken link removed**

 

[3v0]

Agian if you are etching this board to save money you would be better off flipping burgers for a week. It would be faster and in the end you would have a few dollars left over. The right reason for doing this is because you want to learn to do toner transfer.

Three files are attached.
The .zip contains Eagle files. Only the .brd file is modifed, the rest are as Brian provided them.
28DIPA_SS.pdf shows the layers in color, jumpers in red
28DIPA_SS_PRINT_ME.pdf is the actual image you need to print if you do not use Eagle.

I increased the size of pads and spacings to make it easy to drill and solder. The pads on the USB jack are close together. After etching check to be sure they have not been joined. Note that I have not constructed a UBW from this exact layout but the schematic is unchanged and there are no unrouted wires etc so it should be OK. (cover my butt)

You are in for a bit of an adventure. Feel free to ask questions.

3v0

 

[Nibble]

Sounds very interesting.

3V0 is very kindly sharing his work.

I want to know if Arkham00 has built one and if there are any change. I am about to build one, with a PIC18F2450 (it will work with this pic, right?),

A BIG thank you!

 

[3v0]

I think I have one of them in a UBW. Has more memory too if I recall correctly.

Let me know if you have problems.

 

[Arkham00]

Hi Nibble,
I got my first batch of 5 circuits a couple of days ago and I'll mount and test them in the next few days. I'll let you know.
Thanks again to 3v0!

 

[Arkham00]

At last!

Hi 3v0.
Here is the UBW done with your PCB (as you can see).
It's working perfectly.

Thank you again.