Advice for small form factor, wireless, low power solution

hello, arduino community.

today reaching out suggestions , recommendations specific devices purchase project involved in.

my research team , developing embedded systems canes/walkers/etc assessing users' activities. have developed solutions using texas instruments products, want move towards more popular, more accessible platform.

my question is, given small housing space--e.g., 2 cm diameter x 12 cm length cylinder--which microcontrollers , wireless modules (a) fit in space, (b) provide robust wireless communication, , (c) amenable established iot platforms?

i found several resources (links below), i'm not sure how distill of information since iot not area of expertise (i software engineer on team).
(1) arduino/xbee wireless tutorial
(2) wireless buying guide via sparkfun
(3) jy-mcu bluetooth module arduino
(4) rfm12b 868 mhz
(5) erf 0.1" pin spaced radio module


i grateful in matter!

thanks.
-josh

hey other josh,

for 2cm diameter, looks pro mini barely fit:

https://www.sparkfun.com/products/11113

i highly suggest starting regular old uno feet wet first though.

for wireless transmission, going depend on other constraints are.  data rate, power, distance, architecture (one one? 1 many? mesh?), security, etc.

i've heard great things nrf24 chipset, , have exact set sitting on desk @ moment:

http://www.amazon.com/nrf24l01-wireless-transceiver-arduino-compatible/dp/b00e594zx0/

i haven't gotten around doing yet, $7 2 , has lots of arduino support, might not bad start.

i'm not date on buzzwords, don't know internet of things is.  it's 1 of phrases keeps getting tossed around doesn't mean me.  maybe focus more on goals (requirements) , solving problems fitting product / project definition might not achieve want do.  or maybe call in backup hardware person them define iot means them .

as side note, interested in learning more you're working on.  feel free send me pm if don't want broadcast it.

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