Animated Digital Dice w/printable enclosures

thingiverse

The project features four sets of plans for Arduino and AVR-based animated digital dice, along with 3D models for printing enclosures for two smaller designs. Updated on September 10th, 2014, a new documentation file named "documentation-with-oshpark-links.html" has been introduced, which includes OSH Park links for ordering circuit boards as batchpcb.com was sold to OSH Park. The files dice.zip and dice.tar.gz contain full documentation, source code, .hex files, Eagle CAD files, Gerber files, OpenSCAD enclosure models, rendered .stl files, etc. These materials are distributed under the TAPR Open Hardware License. The project demonstrates various AVR and Arduino features such as button debouncing, sleeping the device using power down mode, awakening from sleep with a change in voltage on INT0 pin, enabling and disabling watchdog timer interrupts, software PWM using a timer/counter compare interrupt, and implementing simple timed delay functions. The necessary hardware includes a microcontroller with at least eight digital I/O pins, seven LEDs, seven current limiting resistors for the LEDs, a momentary push-button switch, a pull-up resistor for the switch, an optional bypass capacitor for the microcontroller, and a power source like a 3V coin cell or two AAA batteries. C language source code for AVR-GCC is provided, tested on Arduino Duemilanove (ATmega328p), ATtiny24, and ATtiny2313. The same source code file can be used for all three processors and as an Arduino sketch. While the projects are intended for Arduino, ATtiny24/44/84, or ATtiny2313/4313, the sources can be built for other processors with possible changes. The documentation also includes links to order individual boards from OSH Park starting at $10.95 for three small boards. For complete instructions, see the index.html file in the dice.zip or dice.tar.gz files. For printing enclosures, each part (enclosure lid and enclosure bottom) is in a separate .STL file. The dimensions favor a 0.3mm slicing height, but any setting can be used. The enclosures' fit is intentionally loose for printer calibration differences, but once screwed shut, it won't matter. Slice the parts with 100% infill and 3 or 4 shells; use rafts if desired. For medium-sized enclosure screws, use four #1 self-tapping screws of 5/16 - 3/8 inches (1.4 - 1.5 mm) length, and for the small enclosure, use two #0 self-tapping screws of the same length.