It is doable, but I decided to KISS… If while I am playing with this the Teensy 3.1++ comes out, may try it out, but this may be fun in this form factor to fit it with the XBee. I cut out trying to get to these other pins, as I said it would be a pain to solder the adapter on and have it aligned properly… Also because once you bring every possible pin through, it becomes a real pain to route all of those wires as everything is taken up by the pins. If you add on something like 14 pins on the two rows, that implies the board is now. I agree that the it would be nice to get to all of the functionality, but everything is a trade off. Would be cheaper to produce them in China at SeeedStudio (I think the price was about $22 for 5… This is the one who took over for Sparkfun, they were $34 for the three. I decided to try out OSH Park sales to fabricate 3 boards. But then again don’t really need to work on these now… Or I think you can get some real cheap through either Sparkfun or Seeed studio, but these may take a long time. Bit more expensive, but don’t need to create and send gerbers, they work directly from the data, did this on the last board I did which worked fine. Could also use the default one that is set up with Diptrace. I have used PCBfabexpress for several boards, which has worked out fine. Will play with this a little more and then may order a couple to be fabricated. Simple enough to do like I have done on other boards and simply remove center wire out of jumper and route to signal pin which is near by… There are simple jumpers where you can jumper the added functionality to the default pin or remove it… Also added places for through hole resistors to allow you to add PUs on SCL/SDA. So this decision caused me to remove where I routed those pins to as well… Also decided I did not need the 3 pin connectors for UARTS. But this just seams like a pain, especially getting it properly aligned such that they go through the holes on my board with the other pins as well. I have read up on Teensy forum, that there are parts you can buy that are a 2x7 through hole pin to rectangular SMD pad part, that you can solder on. I updated my Part/pattern for the Teensy, to remove the 14 pins that are surface mount on the bottom of the teensy.
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