Power to open source hardware! Thanks for sharing!
No doubt! And I'm glad to share. After all, I wouldn't have gotten where I am without others sharing as well.
And talking about Open Source in general: I got the inspiration to finally do a 32u4-based board from the work of KK6GIP (https://github.com/johnboiles/tinytrackuino
) who did a port of the Trackuino 1.4 source from the 328 to the 32u4.
And just to say thanks for this work - which saved me considerable time - I'll be giving him one of my assembled Revision "E" boards for the cost of shipping.
So you are using ATMEGA32U4-AU? Isn't sparkfun micro pro using the MU?
Yup. I really like the 32u4 for the extra memory and the "free" serial port (is way cool to have 'Serial' for debugging and 'Serial1' for the GPS). I do hate the $6+ cost (quantity 10) and it's limited availability (but I see the 328p is now over $3 in small quantities).
I'm interested in working with this processor (AU so I can hand solder). Where did you get the EAGLE part? Just asking.
The TQFP part came from Sparkfun's library. I see that Adafruit has it as well.
Oh, I guess you have 3 (or multiples of 3) purple boards for each revision?
Wonder how you knew that? :-)
What about the micro SD slot? Would you be willing to provide some information?
Certainly. But I suspect you'll be disappointed because I'm using the same socket from the same vendor. The footprint I found on these forums. I'll do a follow-up posting tomorrow with a few pictures of the revision "E" board and the post the Eagle files that that time.
I am using this one I got from dipmicro on one of my designs. The pins are not very long so I struggled a bit with it while learning (burning stuff of course) SMD soldering:
Well there is a bit of a learning curve going SMD soldering for any new part. If it would help, I've got at least a dozen unused PCBs with the 32u4 on one side and a microSD slot on the other. I use 805 (mostly), 603 (4x LEDs), and 402 (3x) parts on this board. Plus a SOT23-3, a SOT23-5, and even a 1206 part. Plus 0.1" headers.
I'd be glad to give a couple of them to you (or anyone else) who would be willing to pay a couple of bucks (via paypal) for the shipping cost. They won't work but are good to practice soldering on. Heck I've got a few parts rattling around that I could throw in as well (some 0805 parts that fell on the floor and some others that I haven't bothered to re-use because they are unidentified).
You'd have to supply a sacrificial microSD socket and TQFP CPU but I thought it might help...