This project is about controlling LED matrix displays. It’s about doing the hard work with a microcontroller so that the work left to do on a Raspberry Pi is minimised.
The following diagram represents the system architecture. A Raspberry Pi, on the left, sends text or image data to the display over an SPI interface. The LED controller, in the middle, transforms the display data and generates the control signals required to control the LED matrix display board. The controller then sends the data and control signals over a HUB08 or HUB75 interface to a display on the right. This project is about making the controller, the bit in the middle.
The goal of this project is to make a Pi HAT for LED Matrix displays that supports the HUB08 and HUB75 interface and can drive displays in character or graphical modes. These modes are used to classify the display. Character mode is the simplest. In this mode the Raspberry Pi calls printf style functions with strings of text to write to a display. In graphical mode the Raspberry Pi provides an array of RGB data. Graphical mode will allow you to create static or moving images on the display.
Each Friday is PiDay here at Adafruit! Be sure to check out our posts, tutorials and new Raspberry Pi related products. Adafruit has the largest and best selection of Raspberry Pi accessories and all the code & tutorials to get you up and running in no time!
Adafruit has had paid day off for voting for our team for years, if you need help getting that going for your organization, let us know – we can share how and why we did this as well as the good results. Here are some resources for voting by mail, voting in person, and some NY resources for our NY based teams as well. If there are additional resources to add, please let us know – adafruit.com/vote
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.