scrolling text top hat

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

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

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

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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FastSPI_LED2 Teensy 3 and const array access

So, I am moving my Graphic (Pixel) POI over to using a different LED and Microprocessor. The reason for this is to experiment with using a high density prebuilt strip of LEDs. These strips are 144led/m, individually addressable. To do this I need to use the new driver library for FastSPI. The new library is called FastSPI_LED2 and drives the WS2811 pixels slightly differently. This meant that the syntax for determining the colour of each […]

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OctoSW2811 Teensy 3.0 and Bluetooth

As an update to the scrolling tex project, we now have bluetooth control over the text. I have been working with the btinterface app on android. This is free app, and has the capacity to set up buttons to trigger specific events, but also has a terminal that allows text to be input. I have put a description of how to do it and where to find the app, and some code over on the […]

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scrolling text colour

In a previous post I showed you the code for getting the Octows2811 library to display scrolling text. That code just had a basic colour set into it to get the thing working as a basic test. If you want to control the colour of the text that is being used you can easily change it. Once you implement a small additional piece of code, you can use whatever colour you want. To do this, […]

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graphic poi /pixel poi code

Using the Teensy 2.0 with the 6803 leds is a little bit outdated now, with led strips being available at decent densities. But I thought that I would post some code up as this is still useful as a concept for using programme space, getting values, and structuring methods. update is posted on the graphic poi page mortonkopf

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Graphic Poi Update

Theres an update on the “how to build your Graphic Poi (pixel Poi)” to discuss library setup. And a picture of the different LED approaches available. Here is an image of a visual comparison between making a row of LEDs for the POV from a set of single individually addressable LEDS, and next to it a strip of individually addressable LEDs that are now available to buy. So much less weight and a little bit […]

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