Neopixel Mini Cube

thingiverse

This compact cube is made up of six 4x4 WS2812B panels, featuring a total of 96 individually addressable RGB LEDs. Inside the cube, an ATTiny85 microcontroller runs on a 120mAh Lithium Ion battery. A mercury switch and two transistors are also present to turn the cube on. The cube automatically turns off after displaying various animations. Video: https://youtu.be/mVqQSdfhl90 Assembly: 3D print the holder for the panels with supports and a raft. After removing the support and raft, drill out the holes using a 2.5mm drill bit and create a thread with a 3mm tap. Next, wire up the six WS2812B panels by starting with the four side panels. I used 0.5mm tinned copper wire. Each time you complete a panel, test it on a former and adjust the wires as necessary to get a good fit without straining the connections and having the screw holes lined up. Connect fine insulated wire (I used wire-wrap wire) to the VCC, DIN, GND on the first side panel and VCC, DOUT, GND on the last side panel. Screw on the sides using M3 x 6 or M3 x 8 screws. Next, connect the bottom VCC, DIN, GND to the VCC, DOUT, GND wires of the last side panel and screw it in-place. (See Sketch for a wiring diagram showing how all the panels are ordered and connected). For the top panel, connect the VCC, DOUT, GND to the VCC, DIN, GND wires of the first side panel. Add wires to VCC, DIN, GND of the top panel. These will be connected to the custom PCB. Eagle files have been included so you can manufacture or make the board yourself. Mine was made using the Toner method. I left small holes for attaching wires and connecting the board to my Digispark Development System (https://www.thingiverse.com/thing:3975240). This allowed me to develop the software. In theory, you shouldn't need to do this as you can just program the ATTiny85 and solder it to the board. (Note: The picture of the V2 PCB shown above was my development board. The 1K5 resistor tacked on the board has been incorporated on the V3 board.) The Sketch is included. To program the ATTiny85, I used my AVR programmer (https://www.thingiverse.com/thing:3882262) to burn a Digispark bootloader onto the chip and then programmed it using my Digispark development system. Parts: 6 x WS2812B 4x4 16-Bit Full Color 5050 RGB LED Lamp Panel Light 1 x ATTiny85 SMD 1 x 120mAh Lithium Ion battery 3 x 1M 0805 resistors 1 x 100K 0805 resistor 1 x 330R 0805 resistor 1 x 1K5 0805 resistor 2 x 0.1uF 0805 capacitors 1 x 100uf 10V 3528 Tantalum capacitor 1 x AO3401 P-Channel MOSFET SOT-23 1 x 2N3904 NPN Transistor SOT-23 1 x 0805 Red LED 1 x JST-PH-2-THM-RA socket 1 x 5mm mercury switch