Check out the ESP8266 based wi-fi modules. They are dirt cheap (< $5) and tend
to have excellent range. Sparkfun has some that are nice (and more expensive)
that break out all the processor pins. The ESP8266 is a 32-bit processor with
on-chip wifi. The ESP8266 are now supported in the Arduino environment.
------------------------
If you want to use a uC as receiving partner, i would go for BT/BTLE
rather then wifi as it's easier to setup.
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