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We don't sell this product anymore, but we've left this page here for reference.
The CC3000 microcontroller-friendly WiFi module hits that sweet spot of usability, price and capability.
All wrapped up in a lovely breakout board with an onboard 3.3V regulator that can handle the 350mA peak current, and a level shifter to allow 3 or 5V logic level.
The antenna layout is identical to TI's suggested layout and we're using the same components, trace arrangement, and antenna so the board maintains its FCC emitter compliance (you'll still need to perform FCC validation for a finished product, but the WiFi part is taken care of). Even though it's got an onboard antenna we were pretty surprised at the range, as good as a smartphone's.
New! As of 3/20/2014 we are shipping v1.1 which adds a tri-state buffer to the MISO pin so that you can use the CC3000 with other SPI devices on the same bus.
Each order comes with one fully assembled and tested breakout and a small stick of header you can use to solder in and plug into a breadboard. We don't have a detailed tutorial yet but to get you started, there's a fully working Arduino library that is based off of TI's codebase but adapted for use with the AVR. There is also example code showing how to scan the SSID's, connect to your access point and run DHCP, do a DNS lookup to IP address, ping a site and connect to a remote TCP socket such as a website and print out the page.
Please note the hardware is good, but the library code does not yet support all of the CC3000's functionality. At this moment, SSID scanning, connection, DHCP, DNS lookup, ping, and UDP/TCP client & TCP server connections (eg connect to a website and grab data or host a very short website) all work and are tested with example code. Check out Adafruits tutorial for wiring and Arduino library downloads
For use with Arduino Uno, Leonardo/Micro & Mega only at this time - Adafruit tell us they'll try to get the code ported to the Due at some point but no ETA.