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Arduino Wifi Shields

Arduino Wifi Shield integrated antenna or external connector R1,317
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The Arduino WiFi Shield enables your Arduino to connect to your wireless network and setup is  a few simple instructions. Now it is easy to start controlling your world and arduino through the internet!  
Requires an Arduino board such as the Ardiono Uno, Arduino Mega (not included)
 
  • Operating voltage 5V (supplied from the Arduino Board)
  • Connection via: 802.11b/g networks
  • Encryption types: WEP and WPA2 Personal
  • Connection with Arduino on SPI port
  • on-board micro SD slot
  • ICSP headers
  • FTDI connection for serial debugging of WiFi shield
  • Mini-USB for updating WiFi shield firmware

Arduino Wifi Shield Description

The Arduino WiFi Shield allows an Arduino board to connect to the internet using the 802.11 wireless specification (WiFi). It is based on the HDG104 Wireless LAN 802.11b/g  system in-Package. An Atmega 32UC3 provides a network (IP) stack capable of both TCP and UDP. Use the WiFI library to write sketches which connect to the internet using the shield. The WiFI shield connects to an Arduino board using long wire-wrap headers which extend through the shield. This keeps the pin layout intact and allows another shield to be stacked on top.

The WiFi Shield can connect to wireless networks which operate according to the 802.11b and 802.11g specifications. There is an onboard micro-SD card slot, which can be used to store files for serving over the network. It is compatible with the Arduino Uno and Mega. The onboard microSD card reader is accessible through the SD Library. When working with this library, SS is on Pin 4.
 
Arduino communicates with both the Wifi shield's processor and SD card using the SPI bus (through the ICSP header). This is on digital pins 11, 12, and 13 on the Uno and pins 50, 51, and 52 on the Mega. On both boards, pin 10 is used to select the HDG104 and pin 4 for the SD card. These pins cannot be used for general I/O. On the Mega, the hardware SS pin, 53, is not used to select either the HDG104 or the SD card, but it must be kept as an output or the SPI interface won't work. Digital pin 7 is used as a handshake pin between the WiFi shield and the Arduino, and should not be used.