Step 1: Parts Needed
Poster Board (found at Micheal's arts and crafts)
5mm RGB LED's (I bought at www.besthongkong.com, also at Fry's Electronics)
Resistors for my project I used 330 ohm 1/4 watt resistors, but whichever kind you need for your LEDs, how I have found out is by going to http://led.linear1.org/led.wiz which is a LED calculator, you plug in your information and it tells you the array and what resistors to use. (I bought at www.besthongkong.com, also at Fry's Electronics)
Copper Tape (found at Micheal's arts and crafts)
Wire (found at Fry's Electronics, but I am sure Radio shack has them too)
9 volt battery harness (found at Fry's Electronics, but I am sure Radio shack has them too)
9 volt batteries (found at Fry's Electronics, but I am sure Radio shack has them too)
Choice of wood 1x4x8 (Home depot, Lowe's)
L shape metal Brackets (Home depot, Lowe's)
Screws fir Bracket (Home depot, Lowe's)
Fogged Plexiglas (or clear Plexiglas sanded with medium grit sand paper) (Home depot, Lowe's)
Hot Glue Gun
Skill Saw, or Chop Saw
Carpenters square or Ruler
Step 2: Deciding and Starting on Layout
I decided on 25 RGB LED's
Each square 4 inch's X 4 inch's
25 squares, 5 squares X 5 squares, which makes the main board 20 inch's X 20 inch's
So measure out a 20" square piece of Poster board and start cutting, MAKE SURE IT IS A PERFECT SQUARE!
Step 3: Building Frame
So the poster board is 20 inch x 20 inch, so I cut two of the boards 20 inch long, and then two of the 22 inch long since the boards were 1 inch think, and the longer ones cover two ends of the 20 inch boards. Once you have the boards cut simply butt them all up together in a square, Lay in the poster board and make sure it fits! Then layout out the brackets, and screw it all together!! Easy as that.
Step 4: Prepare Board
Now that you have it all laid out, grab a drill and drill bit. Choose drill bit size that is a little smaller then the end of the led itself, example: if you are using 5mm LED's then maybe go for a 3 or 4 mm drill bit. Now in the center of each box you should have an X, and at the cross of the X should be the very center of each box. So that is where you need to drill the holes!
Step 5: Making the Boxes
Cut 8 strips of the Poster board, 20 inch's in length and 3 inch's in width. I choose 3 inch's in width because that gives you enough room behind the main board for wires and batteries, but also enough on the front for a thin piece of Plexiglas.
Once all those are cut, now measure out and draw a line every 4 inch's. Then another one down the center, which in my case is in 1.5 inch's. For example take a look at the pictures below.
Next you want to cut notches into these poster boards, cut the notches half way down each of the four lines. Cut each notch the width of the poster board. See pictures below for examples.
Step 6: Preparing the LEDs
A trick I figured out is to put the LED on something and then pour the Hot Glue onto the LED while rotating the LED so it doesn't drip.
Step 7: Putting It Together
When all of the poster board is in place and the glue dried, you can slide all of the LED's in the holes. It might help to bend the leads (the two wires) out a little bit so when you flip the board over they will not fall out.
Step 8: Wireing It Up!
Start off by flipping the whole thing over so you can see all the LED leads sticking up out of the main board. Take a look at the LED leads, bend all of the positive leads (longer leads) one direction, and then all of the negative leads (shorter leads) the other direction. It is very important that this is correct or else some of the LED's will not light up.
For Junction points or soldering points I used copper tape, you don't have to do this. Rather you can just solder the wires and resistors straight together, I did this because for me it was quicker and cleaner.
You will want to place one copper strip under the Positive lead so you can solder the positive lead to the strip. You can look at the image below.
The Negative lead will have a resistor soldered to it, so I placed the copper strip at a right angle to the right of the lead. This was so I could solder the resistor to the negative lead, then the other side of the resistor to the copper tape. You can see in the images below.
Once that is set up, you need to decide on how many LED's you want to put on the power source(s), I choose to use two 9 volt batteries. So that makes it 13 LED's on one battery, and 12 LED's on the other. You could use a plug in power source if you like, then you could put them all on one circuit.
Then just start throwing in some wires connecting all of the positive copper tapes together, and all of the negative copper tapes together. Figure out where you want the switch, and where to mount the batteries, then solder the negative end of the battery holder to one of the negative copper tape tabs. And solder the positive to a positive copper tape tab.
At this point you should be able to plug in the batteries, or your wall plug and see the beauty of 25 little boxes changing colors lighting up a room!