Shields are boards that can be plugged on top of the Arduino PCB extending its capabilities. The different shields follow the same philosophy as the original toolkit: they are easy to mount, and cheap to produce.
The Arduino WiFi Shield connects your Arduino to the internet wirelessly. Connect it to your wireless network by following a few simple instructions to start controlling your world through the internet. As always with Arduino, every element of the platform – hardware, software and documentation – is freely available and open-source. This means you can learn exactly how it's made and use its design as the starting point for your own circuits.
GAMBY is a built-it-yourself Arduino shield kit featuring an LCD, 4-way directional pad, buttons and speaker in a form factor reminiscent of several classic handheld video game consoles.
The PCB Proto Shield MEGA for Arduino makes it easy for you to design custom circuits. You can solder parts to the prototyping area to create your project. It has got extra connections for all of the Arduino I/O pins and it has got space to mount through-hole and surface mount integrated circuits.
The PCB Proto Shield UNO for Arduino makes it easy for you to design custom circuits. You can solder parts to the prototyping area to create your project. It has got extra connections for all of the Arduino I/O pins and it has got space to mount through-hole and surface mount integrated circuits.
The Arduino Ethernet Shield allows an Arduino board to connect to the internet. It is based on the Wiznet W5100 ethernet chip providing a network (IP) stack capable of both TCP and UDP.
Adding GPS to your Arduino has never been easier. Multiple GPS receivers attach easily to the shield, and with the example sketch (check below), you will be able to locate your exact position within a few meters.
The Cellular Shield for Arduino includes all the parts needed to interface your Arduino with an SM5100B cellular module. This allows you to easily add SMS, GSM/GPRS, and TCP/IP functionalities to your Arduino-based project.
The IOIO (pronounced "yo-yo") is a board specially designed to work with your Android device (OS versions 1.5 and greater). The board provides extensive and robust connectivity to an Android device via a USB connection.