The storage device for the sensor helmet will be the Sparkfun Openlog. This is a simple serial feed sniffer that drops the data it reads on to a micro SD chip.
I had a chance to try some test sensor data read from the pro mini. The pro mini let me choose a software serial port to output to. Once that was setup, I was ready to connect the Openlog and start it. It really is that simple.
The program I loaded read analog data from 2 different sound sensors and put the values into some variables. All I had to do besides this was output the variable values in the code.
The only thing the Openlog needed was VCC, Grn, and the data line. Once everything was connected I powered it on the data started to log. When I was satisfied with the amount of data, I just removed the power.
To read the data, all I had to do was remove the micro SD chip and insert it to my PC. There it was, all the readings! I could copy the data and import it to Excel, Dashware, or Topofusion for visuals.