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Adafruit 8 channel Level Shift

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£8.99

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.

Although one can use resistors to make a divider, for high speed transfers, the resistors can add a lot of slew and cause havoc that is tough to debug.

That's where this lovely chip, the TXB0108 bi-directional level converter comes in. This chip perform bidirectional level shifting from pretty much any voltage to any voltage and will auto-detect the direction. The only thing that doesn't work well with this chip is i2c (because it uses strong pullups which confuse auto-direction sensor). If you need to use pullups, you can but they should be at least 50K ohm - the ones internal to AVRs/Arduino are about 100K ohm so those are OK!

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