Roughly speaking, using the DMA with FlexIO, the Teensy can drive up to 1 Million LED updates per second, which works out about 32 channels of 100 LEDs per channel updated at 330 frames/sec, so plenty of resource is available.
Arduino led cube 32x32x32 full#
The video does shows a peak power measurement of around this figure, for the whole array on full white, so the maths seems about right.Ĭontrol is via a Teensy 4.0 using the FlexIO function of the IMXRT1060RM CPU, and a bunch of 74AHCT595 shift registers giving 32 channels of up to 1000 LEDs per channel if needed. If we assume each LED consumes 60 mA on full-white (the data for this product link shows a peak value of 100 mA) that is still a total of 246 A or around 1 kW of power.
Now you can simply chain a column of LEDs, with the control signal passed from LED to nearest neighbour.Įarly on in the video build log, you will note there are four power supply modules needed to feed this juice. These are based on the PD9823 controller, which can be programmed as if they were a WS2812, at least according to this analysis. This would be a nightmare to drive with plain RGB LEDs, even with cunning multiplexing, but luckily you can buy indexable LEDs in a through-hole package similar to the ubiquitous WS2812-based SMT LEDs you see around. A larger matrix like this 16 x 16 x 16 LED build, has a total of 4096.
More LEDs need more power and increase control complexity considerably. It’s our pleasure to draw your attention to a lovely build, showing all the processes involved, the problems and the solutions found along the way.īuilding a small cube is somewhat of a trivial affair, especially without considering PWM colour mixing, however as simple maths will illustrate, as you increase the number of LEDs on each side, the total number will quickly get quite large.
LED cubes are really nothing new, many of us consider the building of a good sized one almost an electronics rite of passage that not so many manage to find the time or have the skill to pull off.
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