8 Channel Logic Level Converter
 
Voltage level: 1.8V-6V
Dimension: 38mm x 31.6mm
Conversion  level  range:  1.8 V-6 V
Instructions for use:  (3.3 V,  5 V  to  each other)
4 pairs of power supply interfaces, supports more situation
Using tantalum capacitors for power filter, provides more stability
VCCB 5V  power supply  (can  be an external  5V power supply)
Raspberry Pi 8 channel Level Switching (3.5V to 5V) IO Module Logic Level Converter is able to convert signals from 5V down to 3.3V (and vice versa) meaning you can safely use 5V or 3.3V devices with the Raspberry Pi (compatible).
Because raspberries GPIO is  3.3 V, so regular 5 V sensor is not easy.
Therefore the product realization 8 – channel high – voltage logic and logic low voltage bi-directional transformations embodiment Ax and Bxbi-directional conversion between the two.
 
How to Use?
In the case of translating between 3.3V and 5V system:
    VCCA/VA connects to the 3.3V power supply
    VCCB/VB connects to the 5V power supply
    GND connects to power negative pole respectively, the two power supply should be common-grounded with each other
    When Ax has TTL 3.3V input, Bx will get TTL 5V output
    When Bx has TTL 5V input, Ax will get TTL 3.3V output
    NO direction control required
 
Features :
VCCA Raspberry 3.3 V
8 channels bidirectional voltage translation between different logic level, translate between Ax and Bx automatically
4 pairs of power supply interfaces, supports more situation
Use tantalum capacitors for power filter, provides more stability
VCCB 5V  power supply  (can  be an external  5V power supply)
GND connect the negative pole