Archive for November, 2013

light painting

a quick first attempt to photograph the light staff

Light painting seems a logical progression to the led pov sticks. As the WS2811 leds aren’t too good for the POV work, I thought that I may as well use them for something else. They are fine for use in slower moving projects and static projects so I put together a light staff for light painting: Take a look at the light painting page where I will post some images and a description  

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scrolling text top hat

scrolling text tophat

So, I finally managed to get the top hat sorted out using the Teensy 3.0 and the scrolling text code to display messages. A short video of it is below. The Leds in the strip are bright enough to shine through a very thin mesh that I used to hide the leds strips. Its actually a piece of material from a pair of tights. the hat has two controls at the back, one is an […]

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Led graphic poi displaying BMP image from SD card

POV using ws2811 leds

The Graphic poi (pixel poi) project is now coming to a close. The final stage was to enable the leds to be updated from a series of BMP files held on an SD card. This way, it is possible to hold a large number of images on the device. The poi run off a Teensy 3 micro controller (see the other posts about this). I’m not happy with the result from these WS2811 leds, they […]

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led POV and BMP from SD card with Teensy 3

Moving from one bmp image to the next on the sd Card

I have been looking at storing a larger volume of predefined images and displaying these on the Pixel / Graphic poi. Well, it finally seems to be working. Using the Teensy 3.0 with an SD card breakout board, the poi can grab the data from the SD card using the usual file format (Fat), with a 24bit BMP file. The files are only 60 pixels wide, as thats the number of leds on the poi, […]

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ws2811 and POV

Using the Teensy with led strips for pixel poi

well, I have been experimenting with using the ws2811 high density strips for persistence of vision batons (pixel poi) using the Teensy3 to run the show. Unfortunately, the chips inside the WS2811 leds just aren’t fast enough, as you can see from the image below: the problem is that the frequency of PWM is too slow. Its unfortunate as this strip is 144leds/m, and that gives a nice length of poi for 60 pixels. oh […]

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