Identification Technique

Discussion in 'Wireless & RF Design' started by Oliver Azren, Aug 13, 2015.

  1. Oliver Azren

    Thread Starter New Member

    Aug 13, 2015

    I'm building a 20cm x 20cm table that is divided into cells, it has 4 rows and 4 columns.
    There will be different external blocks that have numbers, each block can stand on a single cell, each block has different number.

    each cell on the table should be able to detect and recognize different blocks, so that i could know which block on which cell ...

    The problem is, what technique can I ably inside the table/matrix to detect and identify these blocks so that, for instance, i know that the block with the number 5 is on the 3rd cell.

    I'm thinking of NFC technology where each cell will has NFC reader and inside each block will be NFC tag but it's not practical due to the size and cost of the reader. any suggestions (it could be wired or wireless technique )?

    Thank you in advance,
  2. ISB123

    Well-Known Member

    May 21, 2014
    Magnets of different sizes could be placed inside the boxes which have different EMF and then use hall effect sensor to detect the position.
  3. BR-549

    Well-Known Member

    Sep 22, 2013
    More information is needed.

    There are 16 possible locations, are there only 16 possible numbers?

    Can a cell not have a block?

    Is the labeled number the only physical difference in the blocks?

    Are you always using the same blocks? Just changing locations?

    What exactly are you doing and why are you doing it?
  4. ericgibbs

    Senior Member

    Jan 29, 2010
    That is a question I would like to see answered.
  5. alfacliff

    Well-Known Member

    Dec 13, 2013
    why not a bar code reader and bar codes for each cell?