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WiFly Shield - SparkFunâs WiFi Shield mainstay, this shield equips your Arduino with the ability to connect to 802.11b/g wireless networks. Then it can act as either a web server, client, or both. Arduino Wi-Fi Shield - This is the Arduino Ethernet Shield sans wires.
Some shields use every pin on the Arduino, while others only use a couple. When stacking shields, itâs important to make sure they donât use overlapping pins. Some shields communicate with the Arduino via SPI, I2C, or Serial, and others use the Arduinoâs interrupts or analog inputs.