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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.
Again, this will create a circuit where 2 LEDs now flash, alternative, like police sirens rotating between a blue siren and a red siren. And this is how LED flasher circuits can be built with 555 timers. To see a project of an LED flasher being built with an arduino board, see Arduino LED Flasher Circuit.e can slightly modify the circuit above so that it flashes 2 LEDs. The LEDs will flash alternatively. As one flashes on, the other flashes off. This happens pretty quickly but it still can be seen with the human eye. Additional Parts. 1  1Kâ¦ Resistor. 2  Red LED.