Corbin's Treehouse - Corbin Dunn, Santa Cruz, CA
Plug Bug

Archive for March, 2014

LED Cyr wheel: on/off switch.

I’m using a 6amp 120V on/off switch. I might be running up to 16 amps through it. We’ll see if this works.. The switch is fished through with wire and fishing line.

LED Cyr wheel: casting…more info

I learned some more things about casting the EpoxaCast 690. On one of the last pieces it was really opaque: I called Smooth-On the next day and asked about it. They didn’t know, so I figured I needed some new stuff and ordered some. When I got home from work that day, I decided to microwave the Part A and this made it start to become clear again. So, apparently it is rather sensitive to temperature, and it being 50-55F in my garage wasn’t good for it. I warmed it up in front of my powder coating oven and the... [read more]

LED Cyr wheel notes: casting

Here’s some notes on casting…maying for myself when I go back to do this again and try to remember what I was doing. First, to get the curve, I would cut the LEDs every 6 and re-solder them together: All us techie programmer know a curve is an approximation of straight lines; and mine are 6-pixel straight lines. Next, casting: I had two materials to cast with (see Casting experiments). Smooth-on EpoxaCast 690, and some Polyester casting Resin. The resin is fairly cheap, and they sell it at my local Tap Plastics store (I discovered that after I ordered it... [read more]

LED Strip test and resin/epoxy

Each time I wire up a new piece I test it to make sure I didn’t mess something up. Here is a test of 4 pieces, rainbow pattern: I did one section covered in the smooth on didn’t work so well. It was to liquidy and probably need more catalyst than what it says in order to cure a small thickness. The test piece sort of felt rubbery, and I forgot to add more. Rubbery might actually be good. The other resin I got was rock solid hard, so I’m trying it on a second piece (so far, it... [read more]

LED Cyr wheel: Wiring up the wheel

I have a 5 piece wheel, and I have a “top” side for reference, and the numbers go from one to five in a counter clockwise direction. This is piece 1 to 2, with the 1 insert on the right side. This right side is the location I will push the chips into. The insert can be used to push them in, and usually the insert bolts will only be removed on the right hand side. Below: The wires coming out the hole: red/black are 5v. They will be split to power each side of the wheel’s LEDs. The white... [read more]

LED Cyr Wheel: v2: Chips etc

Here’s some of my progress and notes on making my new cyr wheel. This is partially so I can look back and remember what I did if I have to take it apart for some reason. The chips that will go in the wheel: Teensy 3.1 is the main processor (black). Pololu voltage regulator (converts the LiPo 7.4v to 5v for the LEDs and Teensy). Accelerometer/gyro combo (middle right), and SD card reader from the guy who sells the Teensy. I made a cradle out of acrylic from TAP Plastics. The circles are turned on the lathe and fit perfectly... [read more]

LED Cyr wheel: WS2811 / WS2812 strip first pixel dying/burning out

I’m having trouble with the WS2811 / WS2812 strip and the first pixel dying or burning out. First off, I thought I ordered the WS2812B strips, which are supposed to be reverse voltage safe. However, I failed to take a close look at the strip I got, and it wasn’t what was in the picture from AliExpress. I have the WS2812 chips. It is too late to try to return it to China, as I took a month off to go on vacation before I came back to the project. Still, apparently people have the same problem with the WS2812B... [read more]

LED Cyr wheel: designing patterns

I’ve had to re-remember a lot of old math that I haven’t used since probably sophomore year in high school; my jr year and beyond was all calculus…which is past what I’m doing here (so far). I ran across on Mac OS X. I haven’t seriously used it before, and usually use my TI85, but I gave it a shot. Oh my gosh; it is amazing! I kept having trouble with a simple x^2 fade in/out equation I was writing. It needed to vary the output value based on: time, number of LEDs per gradient, and the LED position... [read more]

(c) 2008-2017 Corbin Dunn

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