HD44780 module I2C converter for LCD 1602 display for Arduino Raspberry

HD44780 LCD 1602 I2C converter for ESP8266, ESP32, Arduino, Raspberry Pi

I2C converter designed for displays with the HD44780 controller. It lets you control the display using only four lines: SDA, SCL, 5V, and GND, which greatly simplifies building microcontroller-based projects.

The module has a built-in potentiometer for smooth contrast adjustment and also allows software control of the backlight on or off.

Key technical specifications

• Supply voltage: 5V
• Communication interface: I2C
• Converter IC: PCF8574
• Controller compatibility: HD44780
• Contrast adjustment: via built-in potentiometer
• Bus address change: via soldered jumper (A0, A1, A2)
• Backlight: jumper to permanently disable backlight
• Indication: LED indicating module operation
• Dimensions: 42 x 20 mm

Benefits

• Microcontroller pin savings - requires only two signal pins (SDA, SCL)
• Fast and simple integration with popular development platforms
• Convenient display parameter adjustment thanks to the built-in potentiometer
• Hardware I2C address change allows multiple devices on one bus
• Easy power management via software or hardware backlight switching

Example applications

• Weather station projects displaying sensor data
• Operator panels in home automation systems
• User interfaces in measurement devices and testers
• Systems monitoring machine and equipment operating parameters
• Educational projects in microcontroller programming