SparkFun Electronics

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FTDI_SmartBasic
The FTDI SmartBasic uses a multiplexer to allow you to multiplex multiple serial devices into the hardware port on your Arduino Pro, Pro Mini, or other compatible board while still allowing you to program the board via the bootloader.
microSD_Shield
A microSD shield for the Arduino Uno form factor, available from SparkFun Electronics
FemtoBuck
The FemtoBuck is a small 6-36V 350mA constant-current LED driver, with analog or PWM dimmable control options.