4-channel I2C-safe Bi-directional Logic Level Converter - BSS138

I used one of these to convert 3.3V to 5V and drive an Arduino shield. It wasn't a pretty-looking project, but it was fun and got the job done:

I needed to interface RaspberryPi and Arduino Uno to 3.3v I2C buses. These do the level shifting I need in a minimum of space and are so cheap I can't build them for this price, much less this size.One comment, please could you supply right angle pins w

Not done anything with the board yet.(Needs the header pins soldering in)Got them for some future I2C projects. Normal Adfruit high quality board.

Was advised by Roy to use this to boost the signal from a sparkfun colour sensor, so I could use over long distance from microcontroler. Worked perfectly!!!

Using these for SPI at 1 MHz ( 5 <-> 3.3 ) and just works perfectly...

I like that it follows the method recommended in the NXP application note.I had connected a GPS to the Arduino over i2c using 3v, hoping it would work, but it did not. I plugged this in between them and it worked immediately.