I have a need to add data logging to a project.
the ability to use a full on data logging shield is at the edge of the envelope.
however, it looks like I could either re-design the board and all the RTC and microSD card. the flip side is to add pins for two add-on boards, a RTC and a SD card.
The re-designed SD card board http://www.ebay.com/itm/200958993125?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
or some such.
Since I only need one in every 10 boards with the data logging, I am tossed.