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 HDG204 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. 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 HDG204 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 HDG204 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. Note that because the HDG204 and SD card share the SPI bus, only one can be active at a time. If you are using both peripherals in your program, this should be taken care of by the corresponding libraries. If you're not using one of the peripherals in your program, however, you'll need to explicitly deselect it. To do this with the SD card, set pin 4 as an output and write a high to it. For the HDG204, set digital pin 10 as a high output.
If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.
Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Rookie - You may be required to know a bit more about the component, such as orientation, or how to hook it up, in addition to power requirements. You will need to understand polarized components.
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According to Arduino “NOTE: this product is currently retired and the documentation will not be kept up-to-date.” Ok that should not really be a bother but the firmware is outdated as well. Again, according to Arduino: “The firmware for the WiFi shield has changed in Arduino IDE 1.0.4. It is strongly recommended to install this update per these instructions” Look around the Internet for why they so strongly recommend it…. http://forum.arduino.cc/index.php?topic=175173.0 So, you might be able to update the firmware but if you do not think you can, think again about this item. https://www.arduino.cc/en/Main/ArduinoWiFiShield
Update:I went on the arduino.org site and to the link below (from the comments section, thank you Agent JK) to update the firmware. it was not too painful and the shield works just fine. A little bit much trouble for an $85 shield that should work right out of the box but it does work...
1 of 1 found this helpful:
This shield works very well. The one caveat I share with future buyers is the need to update the firmware. This was quite a hassle, and the description on the process is pretty vague. It's doable but this shield is anything but plug-n-play. I purchased mine around 3/2016. Hopefully future version will ship with the firmware updated.