QCCAN 4-Pack 1602 LCD Display Module I2C Blue Screen Backlight 16x2 Character IIC Serial Interface Adapter Compatible with Arduino DIY Project IoT

["Working voltage: 5V; To come with a potentiometer, which is applied to adjust backlight and contrast; How to wire: GND—GND; VCC—VCC; SDA—A4; SCL—A5.","Use the i2c protocol to reduce the occupation of I/O ports, making it easier to add to the project, and less wiring is more beautiful.","Default Address: 0 x 27 for PCF8574T chip; 0 x 3F for PCF8574AT chip; Please kindly check the chip of the i2c interface; ( Please remember to download the I2C library on GitHub before uploading the code to the control board)","Application: LCD module is applied to display letters, characters, numbers, real time clock and temperature; Commonly used in: Internet of things, DIY project, home animation, smartbuilding, maker's DIY project.","Compatibility: 1602 icd display with I2C serial interface is compatible with for Arduino and for Raspberry pi."]