Mr. B. ,
If I wanted to do that what would I use for a card reader since the only ones I have now are shields for an UNO ? .Would I plug the shield into the mega instead of the UNO ? I already have a bare 328 breadboarded and I don't have a mega. Could I just make ribbon cables with female headers to plug into my SD shield and then solder solid 20 or 22 gauge wire leads at the other end of the ribbon cable to plug into the breadboard ? I have a phoenix screw terminal shield for my UNO that I could use for the data acquisition unit and that would allow me to run the wires from the analog inputs on the UNO screw terminal shield and then run serial lines from the Tx & Rx to the breadboarded 328 that is connected to the SD shield. Is this a plausible setup or have I overlooked something ?