Atmega328 - Newbie design

Question

Hi All,

A little new to the Eagle PCB, so please bear with my silly questions. I had designed a single sided board and all ready for etching. Printed the circuit on paper, only to find out that ATmega328 does not fit in the printout. Download all available libraries of eagle and non seem to be working.

Any help would be appreciated.

anishkgt · Accepted Answer

nope it was not. It was the driver of the printer that had the generic rather the manufaturers recommended driver. installed the driver and all worked well.

jc2048 · Answer

That's a horrible layout (in my opinion). Did an autorouter do it? If the primary of your transformer has mains on it, you need much better spacing there than the minimum default setting. The ground layout on the secondary side could be much better too. Having the output cap for the regulator up next to the switches at the top seems like an odd placement. You might also want to increase the widths of the tracks (for current handling ability) around the load switch and the snubber components. The isolation figure for the opto device controlling the triac is meaningless if you push tracks from the low voltage side between the pins on the high voltage side.

If you have to have a single-sided layout, perhaps consider a few wire links on the top rather than the very convoluted paths on the bottom layer.

Sorry if that sounds like a bit of a brutal critique. It's meant to be helpful (so you can improve the layout) rather than stop you in your tracks (so to speak).

Atmega328 - Newbie design

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