Creating a device to measure activity levels of slow-walking people

hi,

i wondering if advice start creating device measure activity levels of slow-walking people.

i use arduino microcontroller along triaxial accelerometer (+/- 2 g good, pretty high precision because need measure slow walking accelerations accurately). in addition, have external memory (such sd card) , wireless transmission of data can transmit raw accelerations pc. looking add in gyrosensor sense incline of lower/upper limb , gps track location. finally, add in lcd display display relevant information user.

so far, i've heard using xbee wireless transmission of data, don't know else. i've programmed different microcontroller before in c along lcd display, think learning program arduino pretty simple.

any ideas on kinds of components should using interface arduino microcontroller? also, thinking of getting 2 microcontrollers, 1 capable (i'm not sure whether choose uno or mega or else) , 1 miniature , size limb sensor (maybe nano). choices? i've read bit shields don't understand much. great!

i'm quite new electronics apologize if i'm asking trivial questions. thank you!

well, arduino can use pretty stanard sensor, pick sensor.  gps module interface via serial, that's easy enough.  rest twi or i2c (just variation on serial), lcd you'll 4-bit parallel , you'll need couple of switches user input think.

what describe isn't complex, largest gotcha keeping 2 linked wirelessly sense incline.  might suggest adding wired sensor upper arm, device being torso-mounted.  relative position going largest pain design.

"shields" boards make connection of various addons easier.  xbee shield makes easy plug in xbee module, ethernet shield adds ethernet controller. 

any arduino job.

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