4-channel I2C-safe Bi-directional Logic Level Converter - BSS138
Ever wanted to use an Arduino compatible device with Raspberry Pi or vice versa? Now you can! Just pop in this Logic Level converter to connect 3.3V and 5V circuits seamlessly including I2C and TTL Serial Signals! 5V inputs get pulled down to 3.3V levels and 3.3V signals get boosted to 5V!