HDSP2111 — Retro LED Display Driver

The HDSP2111 is a gorgeous retro alphanumeric LED display, and this library lets you drive two of them from an Arduino using just two I2C wires. The trick: a MCP23017 port expander handles the parallel interface so your Arduino only needs I2C. Pinout diagrams and a Hello World demo are included to get you started.

View on GitHub

Quick Facts

LanguagesC++
LicenseSee license.txt
HardwareHDSP2111 LED display + MCP23017
Community⭐⭐ 2 stars

If you’ve scored some HDSP2111 displays and want to put them to work, this is the only Arduino library that drives them over I2C. Two wires. Two displays. Done.

Key Features

  • Drive two HDSP2111 displays with only 2 I2C wires
  • MCP23017-based — parallel interface handled for you
  • Wiring pinout diagrams included as images
  • Hello World demo gets you displaying text in minutes

Browse all of Red’s open-source projects on GitHub, or see the full code project archive on this site.