I am trying to implement a concept for somebody else. 

Basically, I want to create a smart surface. I want to create a surface I can throw one or more tagged objects on that should all be recognized. 

I am unsure how to this and what sensors I should use. I have been thinking about using one of the NFC ICs from NXP. However, designing a circuit board and buying this IC is too expensive for our idea. I'm also unsure of whether the surface area will cause problems, because it'll be quite large (think of a small coffee table). 

I've also been thinking about other ways to recognize objects, but I have not come up with anything yet. I am probably not using the correct term. 

Does anyone know of a type or sensor or technique to implement this? 

Note: I am a computer engineer, not an electrical engineer. I know the basics, but really not much more than that, so I prefer a solution that is available as a simple IC or a complete circuit board with the really complicated things done for me by the experts :) 


Question: Is there a list of Mitzvot and their corresponding body parts?
Answer: Biblical mitzvos are in bold. Items that are minhagim or otherwise are not mitzvos are listed for completeness but are not bold. -- Each is followed by the corresponding (set of) body part(s)


30 days of blowing shofar (in Elul) -- 30 in the feet
10 offerings brought on Rosh Hashana -- 10 in the ankles
2 approaches to the aron(?) -- 2 in the shins
5 people called up to the Torah -- 5 in the knees
1 day of Rosh Hashana -- 1 in the thighs
3 types of shofar sound -- 3 in the hips(?)
11 sounds blown with the musaf -- 11 ribs
9 b'rachos in the amida of Rosh Hashana -- 9 in the arms
30 verses recited in that amida -- 30 in the palms
18 b'rachos in the daily amida -- 18 vertebrae
9 shofar sounds with the daily offering -- 9 in the head
8 shofar sounds with two bowings -- 8 in the neck
5 books of Torah -- 5 cavities
6 books of Mishna -- 6 in the heart



Disclaimers: This might be a partial list, a complete confound, or not what you're looking for. Some numbers may need to be doubled for dual limbs. The above most likely does not add up to 248. It comes from  מחזור רבא - נוסח ספרד - ראש השנה, published by שי למורא, on page 198 in my edition. It is part of an inserted piyut in the k'dusha of musaf. A very similar list appears in a number of other machzorim (example) and some translation assistance was provided by this machzor. 

Some of the items on this list are mitzvos, even if it is intended for a purpose other than explication of the statement of Rav Simla'i in Makos that you linked. If they don't count toward the general total then some body parts must double count.