Because the Arduino (and Basic Stamp) are 5V devices, and most modern sensors, displays, flash cards and modes are 3.3V-only, many makers find that they need to perform level shifting/conversion to protect the 3.3V device from 5V.
The SparkFun logic level converter is a small device that safely steps down 5V signals to 3.3V and steps up 3.3V to 5V. This level converter also works with 2.8V and 1.8V devices.
It is the most easy and reliable way to connect the Xbee module to a PC via USB port.
This is a simple SD or MMC adapter card. It allows you to interface with any microcontrollers. It is perfect for mass storage, WAV/MP3 player and data logging.
MinM is a tiny smart LED that's designed for wearable technologies, UAVs and handheld devices.
Looking for a micro USB connector to connect to your project? This'll do it!
This is a simple MicroSD adapter card, that allows you to interface with any microcontroller.
Sometimes it would be very nice to be able to add connectivity to your Arduino/Freeduino project. The Adafruit Ethernet shield kit lets you add network connectivity!