Welcome to RPLCD’s documentation!


RPLCD is a Python 2/3 Raspberry PI Character LCD library for the Hitachi HD44780 controller. It supports both GPIO (parallel) mode as well as boards with an I²C port expander (e.g. the PCF8574 or the MCP23008). Furthermore it can use the pigpio library to control the (remote) LCD.

This library is inspired by Adafruit Industries’ CharLCD library as well as by Arduino’s LiquidCrystal library.

For GPIO mode, no external dependencies (except the RPi.GPIO library, which comes preinstalled on Raspbian) are needed to use this library. If you want to control LCDs via I²C, then you also need the python-smbus library. If you want to control the LCD with pigpio, you have to install the pigpio library.


Already implemented

  • Simple to use API
  • Support for both 4 bit and 8 bit modes
  • Support for parallel (GPIO), I²C and pigpio connections
  • Support for custom characters
  • Support for backlight control circuits (including PWM dimming when using the pigpio backend)
  • Support for contrast control (when using the pigpio backend)
  • Built-in support for A00 and A02 and ST0B character tables
  • Python 2/3 compatible
  • Caching: Only write characters if they changed
  • No external dependencies (except RPi.GPIO, and python-smbus if you need I²C support)


These things may get implemented in the future, depending on my free time and motivation:

  • MicroPython port

Supported I²C Port Expanders

  • PCF8574 (used by a lot of I²C LCD adapters on Ali Express)
  • MCP23008 (used in Adafruit I²C LCD backpack)
  • MCP23017

Indices and tables