If you want to add wi-fi to a project, take a look at the ESP8266 wifi
system-on-a chip. It has a wifi transceiver and a 32 bit processor on a single
chip. People have been getting 300 meter range with a PCB antenna. There is
now a GCC compiler for it... lots of work going on here: esp8266.com
It loads the firmware from a serial EEPROM. There are small PCBs available for
around $5 on Ebay. Standard firmware implements serial to wi-fi.
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