https://hackage.haskell.org/package/pi-lcd https://github.com/ppelleti/pi-lcd I recently bought an Adafruit LCD+Keypad Kit for Raspberry Pi. The LCD+Keypad Kit has a 16x2 character LCD, an RGB LED backlight (depending on the model), and five buttons. It works on all models of Raspberry Pi, and plugs into the GPIO header. https://www.adafruit.com/categories/808 Adafruit only supplies a Python library for communicating with the LCD+Keypad Kit. I wanted to program it in Haskell, so I wrote this Haskell library for communicating with it. The library automatically handles Unicode, using the LCD controller's built-in characters where possible, and using the "custom characters" feature, along with a 5x8 font bundled with this package, to emulate Unicode characters which are not built-in. The user of the library can also define their own custom characters. Everything you need to use one of these LCDs is exposed in the System.Hardware.PiLcd module. The submodules are only exposed because they might be useful to reuse for other types of hardware, such as if you are using an MCP23017 port expander or an HD44780 display controller in some other context. But if you're using the Adafruit LCD+Keypad Kit, all you need is System.Hardware.PiLcd. Before using this package, you'll need to make sure that I²C is enabled on your Raspberry Pi, under "Advanced Options" in raspi-config. Using PiLcd is as easy as: {-# LANGUAGE OverloadedStrings #-} import System.Hardware.PiLcd main = do lcd <- openPiLcd defaultLcdAddress defaultLcdOptions updateDisplay lcd ["Hello,", "World!"] setBacklightColor lcd Cyan closePiLcd lcd There are additional examples in the "examples" directory. This library is specifically designed to work with GHC 7.6.3 and up, and to not use Template Haskell, so it will work with the system-supplied version of GHC on Raspbian "Jessie." Just do "sudo apt-get install ghc cabal-install" and you're good to go. (You should also increase the swap space by editing /etc/dphys-swapfile.) There are other ways to install more recent versions of GHC if you want; see the "Raspberry Pi" page on the Haskell Wiki for details. This is a fairly early release, and there might be breaking changes in the future. Please contact me, by filing a GitHub issue, or by email, if you have any feedback on the library. I'm considering adding support for other LCDs, such as the Display-O-Tron 3000 and/or Display-O-Tron HAT. Let me know if you'd like to see support for those displays. I'd also be curious to hear how the library is being used!