Category: Graphic Poi

Pixel Poi image converter utility for 24 bit leds

Teensy pixel poi image converter

If you are using home made Led pixel Poi, you need to convert your images to pixel array to upload to your micro controller. Here is simple utility that converts your image to an array for APA102 leds or any other 24 bit leds. This outputs an array that you can copy and paste into your micro controller file. The output is set up for Arduino or Teensy output. You can convert your images here: […]

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Teensy3 APA102 Pixel Poi POV Baton

This is the APA102 Pixel poi / graphic poi with Teensy 3

I have updated the Pixel Poi to use some cheap and easily usable led strips. These APA102 strips are better than using individual leds soldered together, and are the first strips that update fast enough to make pixel poi with uploaded images. Go here for > APA102 pixel poi writeup

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Go take a look at Teensy microcontrollers

Using the Teensy with led strips for pixel poi

If you haven’t yet done it, go and have a look at the Teensy micro controller from PJRC. Its powerful, small, has lots of libraries available and, one very large bonus, a very friendly developer and user community forum. You will usually find someone who can point you in the right direction or perhaps even provide an answer to something that has been holding your dev back. I am not associated with teensy, I just […]

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not all pixel poi leds are equal – beware


I have been through a number of different spec leds over the last few years, and this a warning, beware, not all led pixels are equal. Look at the specs and do your research as they are manufactured for different reasons, and so have different specs and limitations. Some, like the WS2811, are manufactured in high density strips and are really easy to construct into batons, BUT… they have a timing issue and colour set […]

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pixel poi, visual poi, graphic poi are all the same thing

Graphic Poi using ws2811 and Teensy 3.0

I have had a few people ask me about the difference between pixel poi, graphic poi and visual poi. Well, they are all names for the same thing. However, the term pixel poi is a registered trade mark of the Feeding the Fish performance group, as “pixel-poi” with a hyphen I believe. Thats why other companies selling and using these types of poi use different names. Here’s an image of a pixel poi, graphic poi, […]

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Wireless control of Led matrix using Teensy 3.0 and adafruit cc3000

teensy 3.0 micro controller with CC3000 breakout board

This is a small project to control an led matrix using wifi, set up to go over a local router. The idea is simply to have a system whereby the led matrix will play animations from software running on a computer that is further away from the led matrix, or where using cables is not wanted. The set up currently works for an array of 8 by 30 leds and uses the freeware pixelcontroller software: […]

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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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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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