View source for Arduino WIFI shield

== Introduction ==
The Wifi Shield is based on Serial to Wi-Fi module Wizfi210 from Wiznet and compatible with Arduino and its clones. The Wifi Shield offers you a quick, easy, and effective way to add Wi-Fi capabilities to Arduino. The Wifi Shield allows you to achieve Wifi communication via UART by sending AT commands, which is an ideal solution for whom with limited or no Wi-Fi or RF expertise. The Shield supports data rates up to 11 Mbps, and is compliant with 802.11b.


== Features ==
*Serial(UART) to Wifi.
*Simple AT commands for configuration and data communication.
*DHCP/Static IP, TCP/UDP, Server/Client, DNS.
*Operates with standard 802.11 b/g/n access points at speed up to 11 Mbps (802.11b).
*802.11i Security (WEP, WPA, WPA2-PSK, Enterprise).
*High-throughput hardware AES and RC4 encryption/decryption engines.
*Limited AP Feature (Direct Connection to iPhone, iPad and Android-Phone without AP).
*Ultra low power consumption through dynamic power management.


==Specifications==

*Wifi Chip: WizFi210
*Radio Protocol: IEEE 802.11b/g/n Compatible
*Supported Data Rates: 11, 5.5, 2, 1 Mbps (IEEE 802.11b)
*Modulation: DSSS and CCK
*RF Operating Frequency: 2.4 - 2.497 GHz
*Antenna Options: Chip antenna and U.FL connector for external antenna
*Networking Protocols: UDP, TCP/IP (IPv4), DHCP, ARP, DNS, HTTP/HTTPS Client and Server(*)
*Power Consumption(Typical): Standby = 34.0 µA Receive = 125.0 mA Transmit = 135.0 mA
*RF Output Power (Typical): 8dBm ± 1dBm
*Security Protocols: WEP, WPA/WPA2–PSK, Enterprise, EAP-FAST, EAP-TLS, EAP-TTLS, PEAP
*I/O Interface: UART, SPI(*), I2C(*), WAKE, ALARM, GPIOs
*System Working Voltage: 3.3V

== Hardware settings ==
=== Selectable UART connection ===
Users can use the jumpers to connect the WIFI_TX and WIFI_RX pins(5V) of Wifi Module to any D0, D1, D4~D7 pin of Arduino.

'''Users must be aware that which Digital pin of Arduino connects to WIFI_TX needs to act as Arduino RX pin(Hardware/Software), and which connects to WIFI_RX needs to act as Arduino TX pin(Hardware/Software).'''

The following figure shows users how to use jumpers to configure UART communication between Wifi Shield and Arduino.


=== Indicator LEDs ===
There are four indicator LEDs(PWR, MODE, WIFI, LINK) on the Wifi Shield, users can know about the working phase of the shield based on the four indicator LEDs. Detailed information please refer to the following table:

=== Antenna Interface ===
The shield comes with a '''2.4G''' antenna; Make sure the antenna is assembled and antenna pad is buckled properly.

=== Buttons ===
There are three Buttons on the Shield. '''Reset''', '''Function''' and''' Alarm1'''.
*'''Reset Button''' is used to reset the Arduino.
*'''Function Button''' is connected to GPIO21 of Wizfi210. If you click the Function Button twice consecutively, the WizFi210 is restored to factory default and changed <Limited AP mode>. And if you click the GPIO21(GPIO10) button three times consecutively, the WizFi210 is restored to factory default and will change to ad hoc mode to configure the WizFi210 via WiFi. (IP:192.168.1.254/Subnet:255.255.255.0/Gateway:192.168.1.1)
*'''Alarm1 Button''' is used to wake up wifi module from Standby Mode.

=== Switch ===
There is a '''Data/Command Mode Swtich'''（connected to GPIO29） on the shield. This switch only operate when user already set up the connection(TCP server/TCP client/UDP), which means module is data mode(can data communication). In this case, when you switch it to command mode, you can setting the module by using AT commands. When you switch it to data mode, you can data communication.

There is a '''Run/Program Mode Swtich'''（connected to UART1_RTS） on the shield. This switch allow user to pogram Wizfi210 chip


==Wireless Communication between Wifi Shield and PC==

===Hardware needed===
*Arduino UNO processor x1
*WIFI shield x1
*WIFI Antenna x1
*Rounter x1

===Preparation===

#Stack the WIFI shield to the Arduino Uno and connect the antenna to the WIFI shield
#Program a simple code as blink without delay for your Arduino UNO first to avoid the serial communication conflict.
#Set the jumpers to connect the WIFI_TX and WIFI_RX pins to enable PC com port to send AT command to WIFI shield directly 
#Set the "Run/Program" Switch to RUN side

===Configure the WIFI shield setting via Serial monitor===

#Please set the baud rate to 115200 bps and Carriage return
#Open the com port of your Arduino UNO. And enter the "AT" to test the communication between WIFI shield and the USB port
#Enter "AT+WS" command to scan the network and get the list of found networks
#Enter "AT+WAUTO=0,TP-ROCKY4M" to Set the SSID of the target router
#Enter "AT+WWPA=geeetech" to set the password for the WPA2 
#Enter "AT+NDHCP=0" to disable DHCP
#Enter "AT+NSET=192.168.1.150,255.255.255.0,192.168.1.1" to set the static network parameters
#Enter "AT+NAUTO=1,1,,5000 " to set the wifi shield as TCP server with port 5000
#Enter "AT&W0" to save the file
#Enter "ATC0" to disable auto connection on next reboot
#Enter "ATA" to start Auto connection