Adafruit 757 logic level converter i2c safe bi directional 4 channel adafruit 757 p the adafruit i2c safe logic level converter lets your 5v arduino or other microcontroller talk to 3 3v sensors displays and flash cards over i2c ordinary level shifters won t work with i2c but this bi directional shifter from adafruit is specifically designed to do just that it uses 4 x bss138 fets with 10k omega pull up resistors allowing 10v on one side and as low as 1 8v on the other plus it also wo