Total cost for these is less than £200 for the pair. You will have to consider these issues when building your own version.ĪPA102 pixel strips (4圆0leds 144leds/m) The trade off is that the battery will only last roughly half an hour when using images with lots of white in them.
Therefore, I am not using a 5v level shifter for these leds, but you can easily fit one (I am saving the remaining space for a flash memory add-on). I decided to go for lightweight, short, fast spin potential, simple, all relating to space inside the tube housing. When designing pixel poi you need to consider: image pixel density, weight of final poi/baton, battery longevity, routine code size, length of baton / poi, brightness of leds.
The finished pov / pixel / graphic poi are 185g each, and 51cm long.īefore going further, it is important to note that my requirements for pov poi may well be very different to yours. The simple image utility for the APA102 24bit image arrays to use them in graphic poi / pixel poi can be found here:ĮDIT: weather has improved the browser based image converter utility: "If you'd like to use (or modify) my brother's enhanced version of Mortonkopf's image conversion utility, it is available here. A red light glows gentle through the plastic indicating charging. The poi are rechargeable via the single Teensy micro usb port, so no opening up to change batteries. The attached code is written to accept any strip length, and uses the FastLED library.
The images are displayed by loading pixel data held in arrays stored in flash memory, and patterns are made mathematically / through code routines. Here is a build example for using apa102 led strips with a Teensy 3.1 as an example of making some relatively cheap pixel poi that are capable of displaying images or patterns.
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