Animated Matrix Dice

thingiverse

This electronic dice is a re-creation of Thomas Angielsky's Shaking Arduino Dice. The original project can be found on Hackster.io at https://www.hackster.io/tangielsky/shaking-arduino-dice-39fc6a. Video: --------- The video demonstrating the functionality of this remake is available at https://youtu.be/xUGiYDywZfw. Design: -------- The goal was to minimize the size of the final unit, making it no wider than the LED Matrix itself. To achieve this, I replaced the Arduino Nano with a Digispark board and later swapped it out for a single ATTiny85 IC. This required modifying the software to fit within the ATTiny85's constraints and adjusting the interrupt handlers since the ATTiny85 only supports one interrupt vector for detecting pin changes. A custom PC board was designed to house the vibration switches, ATTiny85, power switch, and 3.7V 120mA/Hr battery. This board was created using the Toner method and is soldered onto the pins of the MAX7219/8x8 32mm Matrix board. Included are the Eagle files and Digispark sketch. I programmed the ATTiny85 chip on my homemade Digispark board, tested it, and then transferred it to the custom PC board for final assembly. The software will work seamlessly with a commercial Digispark board as well. Parts Used: ----------- 1 x ATTiny85 1 x 32mm x 32mm 8x8 LED Matrix with MAX7219 board 1 x 3.7V 120mA/Hr battery 1 x 2 Pin JST 2mm right angle socket 1 x 0805 1K5 resistor 1 x SMD slide switch 2 x Vibration switches (cylinder & ball bearing type) Software: --------- The sketch is included, with well-documented code.