Arduino 7×20 LED Matrix Marquee

with serial interface and therefore Bluetooth capability 🙂




The circuit diagram for the Marquee can be found here
I’ve adapted some Arduino code discussed in the forum (see code below) to work with this device and added a serial interface. The rows are adressed directly via a ULN2003 chip and the colums are adressed through 74HC595 shift registers. The code multiplexes the rows and therefore has less flickering. The device uses a total of 10 microcontroller pins (1 per row and 3 for all the shift registers).




Here’s the project in its compact version with an Atmega328 (arduino bootloader) and a 5V Voltage regulator.




matrixboard

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