Your 3.3V devices like gyro or SD card might go up in smoke if directly connected to a 5V Arduino board. Similarly, your Raspberry Pi will get damaged if connected to a 5V device directly. To get over these issues you need a device that can safely shift 3.3V signals up to 5V or 5V signals down to 3.3V. This four channel bi-directional logic level converter is such a device. It can simultaneously shift 4 signals from 3.3V to 5V or vice versa. It also works with 2.8V and 1.8V devices.
This level converter is very easy to use. The board needs to be powered from the two voltages sources that your devices are using. Connect high voltage (5V for example) to the ‘HV’ pin, low voltage (3.3V for example) to ‘LV’. Connect ‘GND’ pins from both of the devices together and you are ready to use it.
1. Compatible logic levels: any voltage level between 1.8V to 5.5V.
2.Maximum baud rate for serial communication: 115200.
3.Tested to work with I2C and SPI communication.
4. Number of channels: 4
5. Bi-directional communication, data can be sent from Low voltage side to high voltage side and vice versa.
6. Application: use it to connect your Arduino to raspberry pi, digital gyro, accelerometer & compass, SD cards, external EEPROM, EGBT-045 bluetooth board etc.