Jurek and the Amazing Techno, Colored DreamWall

Jurek and the Amazing Techno, Colored DreamWall

The title is mostly a placeholder, as I haven't really figured out a name for it yet. This project is a wall hanging that consists of semi-large triangular pixels using discrete RGB LED's and PWM to control intensity levels of each LED, resulting in a 4096-color display.

Monday, May 16, 2005

Color mixing

I put in another order with Digi-Key today. This order consists of the correct sizes of resistors and capacitors (hopefully). I also ordered a couple PLCC sockets for the uC as well as 3 uC's (just in case) and some other random sockets and headers I may or may not need.

My order of test LEDs from SuperBrightLEDs came in today.
I was hopefuly of the 3-color LEDs, but it turns out that the colors come out parallel, so that there's a small amount of overlap of colors, but the cones are all in a line and would never mix properly. Oh well, that's what testing is all about.
I also got 3 bright individual colors and used those to test instead. I had never really had a good setup to test mixing of colors; it was always just me trying to hold 3 different LEDs at 120-degree angles and all focused at the same point on a piece of paper while looking through the acrylic from the other side. Basically, a real hack job.
I grabbed some cardboard from a shipping box and cut out a square and then used a triangle pattern to form a triangle box to mount the LEDs. I lined this little box with aluminum foil and then taped a white paper triangle in the center. I cut slits in the middle of each of the walls, to hold the LEDs and... viola... this is what resulted:

Not especially snazzy, but hell, it works. Here's a bunch of pictures from the results of my test:

The white is kinda weak in the green and a little heavy in the red, but I think I can play around with that fairly easily. The top diffuser I used was just a white sheet of paper between the triangle box and the acrylic, so it's rather chunky and not really what I'm looking for in a diffuser.

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