Make magazine recently did a series of three articles on a wifi processor that can be had for $5 - $7 USD. They've even added an arduino library. http://makezine.com/2015/04/01/installing-building-arduino-sketch-5-microcontroller/ http://makezine.com/2015/04/01/esp8266-5-microcontroller-wi-fi-now-arduino-compatible/ http://makezine.com/2015/04/01/designing-breadboard-adaptor-5-esp8266-microcontroller/
Join the conversation! The forum activity is now at GOATeach.org! We are working to cross pollinate our conversations. Document and share tools at farm hack and talk at GOAT! Also join GOAT riot and introduce yourself and your projects!
Cheap wifi option