![]() ![]() (Lead Photo above) The final two-line LED sign and controller with a red plastic filter that enhances contrast. The controller board drives each row of LEDs and sends bit patterns to each row in sequence. It is designed with expertise for easy programming, great flexibility for use in public areas, stations, banks, stock exchange, restaurants, buses and trains. ![]() ![]() 'RHINO' LED DOT MATRIX SIGN BOARD, Is a new product made by Leeway Engineering & Trading Co. When you plan to create a large sign with LED dot-matrix modules, the circuits and software can seem like a big challenge. Download popular programs, drivers and latest updates easily. However, the step-by-step approach in this tutorial gives you what you need to know to make a sign of your own. I bought a used LED sign from a local electronics store and took it apart. It contained two rows of 14 large 5x7 LED modules. The display lit up with messages from an old arcade game, but I couldn’t figure out how to get it to display new information. With the help of a logic analyzer, I determined how the controller worked and decided to keep the display board, then scrap the controller and create my own. I’ll explain how to do it, and you’ll have a complete dot-matrix sign-control circuit and software along with PCB (printed circuit board) layouts and plain-text code. A programmable system on a chip simplifies controller hardware and software.C code addresses the proper rows of bits in an EEPROM to get and display characters.An MCU (microcontroller) stores and uses bit patterns to represent letters, numbers, and punctuation marks.FETs and shift registers control LEDs in a sign.You can control 5x7 or 8x8 LED modules ( Note 1). To start, look at a 5x7 LED module that provides a matrix of LEDs ( Figure 1). The LEDs for our project require common-anode connection for the rows and common-cathode connections for the columns. ![]()
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