**If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The Bidirectional Logic Level Shifter is a small device that safely drops the signal from 5V to 3.3V and rises it from 3.3V to 5V This level shifter is also suitable for 2.8V and 1.8V devices. The board needs to be powered by two voltage sources (high and low) used by the system. The high voltage (e.g. 5V) is connected to the "HV" pin, the low voltage (e.g. 3.3V) is connected to the "LV" pin, and the ground is connected from the system to the "GND" pin.

Wiring Instructions:

LV(1-4) input and output 3.3V TTL,

HV(1-4) input and output 5V TTL,

LV(1-4) and HV(1-4) two-way interchange**