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Wifly Shield

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The WiFly Shield is a nifty piece of hardware that equips your Arduino with the ability to connect to 802.11b/g wireless networks. This version breaks out the PI09, FORCE WAKE, and the hardware reset lines. In addition to having a different crystal than the older revs, this version uses Roving Network’s RN-131C wireless module and an SC16IS750 SPI-to-UART chip. The SPI-to-UART bridge is used to allow for faster transmission speed and to free up the Arduino’s UART.

Power is taken from the Vin pin of your Arduino, regulated to 3.3V, and provided to both the RN-131C and the SC16IS750. You’ll communicate with the WiFly Shield over SPI using Arduino digital pins 10-13 (CS, MOSI, MISO, SCLK respectively).

I’ve gone ahead and had the headers pre-installed so you don’t have to bother with soldering them on before getting your project started.


  • Qualified 2.4GHz IEEE 802.11b/g transceiver
  • Max 4Mbps sustained data rate with TCP/IP and WPA2
  • 8 Mbit flash memory and 128 KB RAM
  • Accepts 3.3V regulated or 2-3V battery
  • 10 digital GPIO
  • 8 analog inputs
  • Uses digital pins 10, 11, 12 and 13 (CS, MOSI, MISO, SCLK respectively)
  • Part: WRL-09954


Get in touch if you have any questions, or ideas for something you want me to build.