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. 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.
Simpleimage python code#
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. PYTHON IMAGE SQUEEZE HEIGHT FOR LOOPS SIMPLEIMAGE CODE I decided to go for lightweight, short, fast spin potential, simple, all relating to space inside the tube housing. 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). The trade off is that the battery will only last roughly half an hour when using images with lots of white in them. You will have to consider these issues when building your own version.ĪPA102 pixel strips (4圆0leds 144leds/m)
Total cost for these is less than £200 for the pair. The APA102 leds were chosen as they are the first affordable pixels to come on a high density strip, that also have a suitably high refresh rate. Previous experiments with led strips such as the ws281* did not perform well, gave a speckled image at best, and forced a very slow rotation speed to be used to get effect at all. The APA102 were ordered from China as they were so very much cheaper than buying them from a US or European supplier. Adafruit are more expensive and sell them under the ‘dotstar’ name, I don’t know why. The leds come on a reel with joins in the continuous strip every 50cm. This may important for you, as where they are soldered together the gap between the pixels is ever so slightly greater than the rest of the pixels.
This does not make much difference in general, but was a factor in me deciding to cut the strips at this point rather than have the solder point somewhere in the middle of the poi. The Polycarbonate tube and strip were ordered with the Teensy in mind.
The internal diameter (22mm) is such that the Teensy 3.1 and the 14500 (AA size) 3.7v lipo battery can fit inside together. Polycarbonate is good material to use in that it is strong, can take a knock or two, does not react badly to strong glues, can be drilled and cut without shattering or splintering, and is reasonably lightweight. It is also readily available from mail order services that cut to size and spec. I went a such a tight squeeze so that I could keep the tube as small as possible = as light as possible. The led strips were fixed to the polycarb strip that goes inside the tube. PYTHON IMAGE SQUEEZE HEIGHT FOR LOOPS SIMPLEIMAGE CODE.
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