The ATEXTWIFI is a complete IEEE802.11b+g WLAN evaluation and development kit for 32bit AVR UC3 microcontrollers. The kit contains the HDG104 WLAN module from H&D wireless AB, which offer the low power consumption, high communication speed, and long range. The WIFI extension board has an SD card form factor, and connects easily to any 32bit AVR UC3 evaluation kit with a SD card socket. The WIFI TCP/IP stack is included in the AVR UC3 software framework, and supports both SPI and SDIO communication to the board.