so if you do it right it does not have to look like mine however you can if you want. Therefore you be smart and do it right the first time. this is because the first time i did this i completely forgot the resistors.so i did some improvising and it is kinda backwards to normal thinking. Also you will notice that the wires are kinda on the resistor backwards to common since. As you see all columns are connected to a 220 ohm resistor the another wire comes out the top of the board and goes to the Arduino. The fifth picture is of the entire Cube board. Also all four layers come into this board and then leave to the transistor Board. (The Top) Second Make the main cube board: All that really happens on this board is that all 16 columns are connected to the Arduino through a 220 ohm resistor. (The Bottom) The Forth picture is the actual Transistor ground board. The third picture is the actual Transistor ground board. The second picture is my drawing of the transistor array controlling the 4 ground layers. The first picture is of both boards to understand how they connect to each other and the Arduino. (Look at picture 2 and it will make since. Lastly the Emitters should go to the layers on the Cube. Then all four bases should go their own pin on the Arduino. In a nut shell connect all the collectors together, theses all go to a ground pin on the Arduino. If you plan on writing your own like i did you can skip this and plug the four ground layers directly into the arduino! Its made with 4 NPN type transistors. First Make the Transistor arrays: NOTE: The transistors are only necessary for some of the codes out there. I drew these drawings if you can understand my way of labeling. Each of the four levels connects to ground via a NPN transistor when activated by an Arduino pin. Each of the 16 columns will connect to a pin on the Arduino through a current limiting resistor. (long leg is positive, short is negative) So just use a 3v battery between the two legs of the LED. I'm sure they would be pretty hard to replace. Your going to want to test you LED's before you solder them into place because it would be sad if you put your cube together and had one in the middle that didn't work. (this is determined by how long the leads are on your LED's. draw a grid to the size of the cube you want. To begin the Construction of the cube use a drill with the proper size drill bit to make holes in a piece of wood. Now if i want to light up the LED in the upper left corner in the back (0,0,3), I just supply GND (-) to the upper layer, and VCC (+) to the column in the left corner. All the LEDs on a horizontal layer share a common cathode (-). All the LEDs aligned in a vertical column share a common anode (+). The cube is split into 4 layers of 16 LEDS. So that's when i added the vertical columns of wire to solder the anodes too. After i started to do that i then realized that it would the be shorter than it is tall making it a rectangle rather than a cube. Therefore when Finally got the LED's they were a lot smaller than i anticipated, and i did not want to redo my circuit board, so i just made frames out of craft wire to hook all the cathodes to. This is because I actually made all the wiring and circuitry when i was waiting for my LED's to get here from China.(Note that it takes about two weeks for the lights to get to you). If you look at the pictures of mine the LED's are not all just soldered to each other. The first thing you must do is make the cube. Read the ENTIRE instructable before building design options mentioned in last steps. So if you already have a Arduino the cost is brought down to $40. In all the cost of this cube is relatively low at around $100 (according to where you get your parts) the Arduino was the most expensive part at around $60 For MEGA and i think a UNO is around $30.
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