Satisfaction Guarantee: If you encounter any problems in the use of welcome to consult with us, we are happy to solve all your troubles, please rest assured that the purchase The LCD2004 with an I2C port is developed to solve the multiple IOs problem. It is a high-performance serial bus with bus rules and high-speed or low-speed device synchronization required for multi-master systems. The I2C bus has only two bidirectional signal lines, a serial data line (SDA) and a serial clock line (SCL). Specification: Dimensions (LxWxH): Approx. 41.5 x 19 x 15.3mm/ 1.63 x 0.75 x 0.6 inch Weight: Approx. 5g Display: 2 lines x 16 characters Backlight: with blcak character color LCD controller: HD44780 Features: Low power consumption, easy to use Pin Definition: VCC/ GND/SDL and SCA Contrast Adjust: Potentiometer Backlight Adjust: Jumper Default Address: 0x27, 0x3F Working Voltage: 5V How to wire: GND—GND; VCC—VCC; SDA—A4; SCL—A5 Application: Used to display Characters, letters and Numbers Compatible with banana Pi, Tinker Board, STM32, ESP32 etc. Package Included: 2 x 2004 LCD Display Module 2 x IIC/I2C/TWI Serial Interface Adapter Allinan: We aim to make your work Easier & Funnier!?Widely Application?: The LCD has always been a device that acts as a window in human-computer interaction. For example, the prompt window on some instrument devices, the temperature and humidity prompt box, the device running status monitor, and the prompt screen of the counting device all have LCD figures. ?Compatibility?: LCD display module based on the popular HD44780 controller, compatible with beagle bone black, tinker board, stm32, esp32 and more.This kit contains 3pcs IIC/I2C/TWI serial interface adapter, you can start your project at any time. ?Support IIC Interface?: It only takes two I/O port thus saving more for other usages. You can adjust the contrast by the potentiometer at its back. If you don’t want the back light, you can also unplug the jumper cap at the LCD back. ?20x4 LCD Display?: The common LCD1602, LCD2004, and LCD12864 are fabricated using liquid crystal materials and communicated using the I2C bus. Totally display 20 characters in one row, 4 rows can display 80 characters. ?Programmable?: With the 2004 LCD shield, you can display whatever you want by programming the code, board. Therefore, this is a perfect choice to make your project more interesting and vivid. The interface chip separate from the displays.