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build the $50 robot and add the BlueSMiRF from sparfun.com
Inductive transmission might be a solution, but, you must somehow ensure that a given magnetic coupling will be extremely local, and it won't be influenced by other sensors' magnetic coupling.ZigBee is one solution.Adding a small IR led to each sensor, along with a microcontroller, to modulate the data would be another idea. IRDa might be another solution.Or you could use the nordIC RF chips, or something like CC1000.