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Level Convertion
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Adafruit 8-channel Bi-directional Level Converter – TXB0...
$10.39 CADBecause 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.
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PCA9306 Level Translator Breakout
Sometimes, voltages collide. When you have parts that expect/speak at different voltage levels, you have to build a mediator to smooth things out. This SparkFun BOB-10403 uses PCA9306 two-channel bidirectional voltage-level translator on a nice, small breakout board.$9.09 CADIn stock
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Solarbotics I2C Shift Leveler
This little I2C adapter will have you shifting signals with ease in no time flat.$11.69 CADIn stock
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Sparkfun Logic Level Converter
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.$6.69 CADIn stock
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