If you are using the shield with an older board, you need to connect the shield's IOREF pin to 3.3V. The WiFi board uses the IOREF pin on newer Arduino pin layouts (Uno rev3, Mega2560 rev3, and later) to sense the reference voltage for the I/O pins of the board to which it is attached. ![]() If you are using the WiFi shield with an Arduino earlier than the Uno rev3, you need to make the connection below for the board to work. Once the sketch has been uploaded, you can disconnect the board from your computer and power it with an external power supply.ĭigital pin 7 is used as a handshake pin between the WiFi shield and the Arduino, and should not be used. To upload sketches to the board, connect it to your computer with a USB cable as you normally would. ![]() To use the shield, mount it on top of an Arduino board (e.g. The WiFI library is similar to the Ethernet library and many of the function calls are the same. It is strongly recommended to install this update per these instructions The firmware for the WiFi shield has changed in Arduino IDE 1.0.4. The WiFi Library is included with the most recent version of the Arduino IDE. ![]() The Arduino WiFi shield allows an Arduino board to connect to the internet using the WiFi library and to read and write an SD card using the SD library.
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