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Anyone that has played with sensors has ran into the problem of the different voltages. Not all sensors are 5V compatible. They come in a variety of different voltage requirements, which can be a nightmare to set up correctly without frying your sensor or development board. The Bi-directional Level Shifter allows you to set the high and low voltages that you need, and then allows communication between your micro-controller and the sensor without frying either one. Each Level Shifter has four channels each having a high and low side.
How to use:
You are going to need two power sources: a high voltage, and what your sensor or breakout board is going to use. Then you are going to hook up the high voltage (say +5V) positive to HV and Ground of the high voltage to the GND on the HV side. Do the same for your low voltage (3.3V down to 1.8V) side.