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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.
2) No, most wall warts will not give you the voltage you need to power the Arduino with only 24VAC input. You can fairly easily build a small power supply with a bridge rectifier, a few capacitors, and a small voltage regulator.All of which are fairly inexpensive.) No, most wall warts will not give you the voltage you need to power the Arduino with only 24VAC input. You can fairly easily build a small power supply with a bridge rectifier, a few capacitors, and a small voltage regulator.