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Step 1: Materials
The PIC drives the cube without external IC's and with very few extra components.
To make your own LED cube you'll need:
-A PIC16F628A Microchip microcontroller ($2 ebay)
-27 diffused LEDs ($3.50 50pcs ebay)
-7805 voltage regulator ($0.99 3pcs ebay)
-9 330ohm resistors ($1.14 ebay)
-12 male + 12 female headers ($2.59 ebay)
-18 pin DIP IC socket ($0.99 10pcs ebay)
-Controller and cube circuit boards (make them yourself)
-16v 100uF electrolytic capacitor (recycled from old boards)
-100nF ceramic capacitor (recycled from old boards)
-Plug and small heatsink (recycled from old boards)
Step 2: The Controller
First, make the controller board (instructions here), drill the holes and tin the pads carefully.
Place all the components as shown in the picture and solder them in place.
Step 3: The Cube
Mark a 3x3 1 inch grid in a corck and hole the places for the LEDs, this will keep them aligned while you bend and solder the leads.
Place them diagonally so the leads won't touch, solder the cathodes to one side and then bend the anodes above the cathodes. Solder the anodes 90º away from the cathodes.
Repeat the process to make two more grids and place them on each other making anodes and cathodes be in the same side.
Bend the 9 protuding cathodes down and solder them in 3 columns.
I've bent the 9 anodes so they came arranged in three groups of three, you can simply solder a ribbon cable, but it won't hold the cube up as a structure.
Use the pictures to guide you.
Step 4: The Base
To plug the cube in the controller i made a base board.
It's useful for unplugging the whole cube from the controller board so you can access to the microcontroller and stract it for re-programming.
Use the circuit stencil to make your own board.
If you prepared you cube like mine, you have to solder the heathers, insert the cube in the PCB holes and solder it from upside.
Make sure the cube module fits in the controller board.
Step 5: Programming
Time to program the microcontroller!
Open your favourite programming program,
plug your PIC into the programmer,
choose the file ''LED cube HEX'' and upload it,
configure the right fuses
and program your microcontroller.
More programs can be made for different light patterns, but i don't know how to do easily.
If you know how to do it, how make your own patterns, please, tell me.
Step 6: Final Details
As finishing details i added four PCB mounting bolts to make it stand on them, that will avoid short-circuits if the cube is placed on a metal surface.
You'll also need to connect the cube to a power supply so solder a plug cable in the input pads.
I noticed that the lm7805 i trimmed off was overheating when i use a 12v power supply due to the input and output voltage difference.
It couldn't sink all that heat with the small surface i let, so i cutted a small piece of aluminium heatsink and i thermally-glued it to the voltage regulator.