Tuesday, October 16, 2012

AVR Dragon Jumpers - ISP for Atmega 168/328/etc

I've been trying my hand at etching pcb's lately. As a result I needed to burn a bootloader on a Atmega 328 and I didn't put a ISP header on my target board. I really need to get in the habit of doing that. Usually I just stick it in my dragon, connect it up with a bunch of jumpers and burn it.

A while back I saw someone had made a whole set of boards for this purpose. You just plugged in the board and never get a wire crossed again! I made a brief search for them but couldn't find anything useful (schematic, pcb layouts, etc). So I made my own. So far I have made the ISP for the 168/328. Sometime I will make the HVPP for these and both for the 644/1284.

You may notice that I have a mix of male and female headers. When I got my dragon I put mostly female headers on (excluding JTAG and ISP) so I could use normal jumpers rather than special female ones. I still think it was a good idea, but most people use all male headers, so the board could use all females.

I only put the used headers for ease of use and cost control. For soldering I put all the headers in place on the dragon then added the board. It keeps everything perfectly aligned.

Etch-resist was a laser printer transfer, cupric chloride etch solution. I'll do a post on that whole process later.

I intended to attach the KiCAD Schematic and PCB file here, but I can't see how to do that (might not be possible), so I posted it over on TryThisTv.com

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