nofalls

Ah ha. The Pins must have changed between the V2.2 and the V3 because I just looked at the photo of your board and see the A7 by the 5V.

Tom M'Guinn

Maybe version 3 is different...

Tom M'Guinn

Posts crossed. Looks like you're right. I have a few of both handy, never realized...

Tom M'Guinn

I'll update the schematic and specify the Nano version. Nice catch!

nofalls

Yeah, the lousy footprint i have does not have the pin markings on the silkscreen... yet. Easy to fix in the program but it would have me scratching my head for a bit.

nofalls

Still need to clean up the library files to get things to look right and have the pin parkings but it is a start.

nofalls

Eagle files for the board. Probably needs a little more love but this is where I'm at right now.

Freeware version of Eagle can be found here: http://www.cadsoftusa.com/download-eagle/?language=en

Files attached.

Let me know if you want anything changed or fixed.

Tom M'Guinn

I'll take a look (might take a bit) and hopefully others with more electronics background will do same. Joshua had suggested a diode to protect against crossed power wires, for example, and buffering the output. Neither of which seemed mission critcal to me, but no harm done if you wanted to add. (Assume you know, but the schematic you posted above shows 75c14 rather than 74c14...)

nofalls

I had to type in the name for that one. Fat fingers. Fixed on the board now.

Diode on the +12 in would be easy. No so sure about how to provide buffering to the ground signal from D7. Any ideas?

Tom M'Guinn

I'd want to test it on a breadboard first but imagine you could use an unused trigger in the 74c14 to buffer the output, so you don't have to add more parts.

nofalls

Cool. You test. I'll add if it works.

Tom M'Guinn

Ok, it may be a little while, as the car is undergoing enhancements at the moment...

BoostBuggy

@Tom M'Guinn, PM set