ATmega328P HUB75 16x32 matrix display driver

thingiverse

This is a custom 5x5cm Arduino UNO board that enables easy connection to HUB75 interface LED displays. If you're not familiar with these displays, you can purchase one from Adafruit's 16X32 RGB LED MATRIX PANEL or Aliexpress. HUB75 interface LED displays typically come with a flat cable for data and power cables. After soldering this PCB, all you need to do is connect the power cable to the screw terminal and plug in the flat cable to the PCB and LED display. The pinout is compatible with Adafruit's "RGB matrix Panel" library, but I wanted to understand how HUB75 interface works, so I created my own library. Five free pins can be used to connect sensors or other devices. See examples below. Gerber files for Seeedstudio Fusion PCB service are attached, which will cost $10 to produce 10 of this PCB. Also, Eagle schematic and board layout files are attached. I designed this board as follows: Schematic: You'll need the following parts: ATmega328 with Arduino Optiboot (Uno) Resistor 10k Capacitor 22pF x2 Capacitor 100nF x5 Crystal 16MHz Capacitor 470uF x2 DC Barrel Power Jack/Connector like this Two pins screw terminal block 3.5mm pitch like this Switch like this, optional if you want a reset button DIP Socket, 28 Contacts, optional Two jumpers Break Away Headers 18 pins like this Resistor 330 Ohm x5 (optional) RUEF250U Fuse (optional) Ribbon Cable Connector 2x8 like this The board: As you can see, there is no USB interface on the board, so you'll need a USB to serial cable to upload sketches. I use SparkFun FTDI Basic Breakout - 5V. Using jumpers, the board can be configured for panels with 3 bits of row address (A,B,C) usually 16x32 or for panels with four bits of address (A,B,C,D) usually 32x32 panels or larger. For panels with 3 bits of row address, you need to short NOD1,NOD2 jumper as seen on the picture. For panels with 4 bits of row address, remove jumpers from NOD1,NOD2 and put them on NOD3,NOD4. There is no USB interface on the board, so you'll need a USB to serial cable to upload sketches. I use SparkFun FTDI Basic Breakout - 5V. Using jumpers, the board can be configured for panels with 3 bits of row address (A,B,C) usually 16x32 or for panels with four bits of address (A,B,C,D) usually 32x32 panels or larger. For panels with 3 bits of row address, you need to short NOD1,NOD2 jumper as seen on the picture. For panels with 4 bits of row address, remove jumpers from NOD1,NOD2 and put them on NOD3,NOD4. References: atmega328p: http://www.atmel.com/images/atmel-8271-8-bit-avr-microcontroller-atmega48a-48pa-88a-88pa-168a-168pa-328-328p_datasheet_complete.pdf Inline assembler: http://www.nongnu.org/avr-libc/user-manual/inline_asm.html HUB75 interface: https://learn.adafruit.com/32x16-32x32-rgb-led-matrix/how-the-matrix-works