The top board in the photograph is an ESP board that just happened to be on the breadboard. The lower Arduino is being used as a 5V power supply, relegated to such duties in the face of such a superior computing device.
You can see his code here on his GitHub. After his proof-of-concept, [Ivoah] also made a video of it working and began to program a graphical interface for controlling the LEDs. Video after the break. Sometimes you design the hardware around the software, and sometimes vice-versa. These long wires snagged on stuff, and pulled the solder connections apart. The fix? Alternate rows of left-to-right with right-to-left to minimize wiring and make nice, robust connectors for the ends, and a much more elegant implementation at the expense of more complicated software to drive the device.
Alternating rows have to be flipped horizontally, so this means custom driver routines. Once the signal got to the first pixel, though, everything was fine. The solution? Add a single pixel at the front of the chain to buffer the SPI lines and serve as a bonus status indicator. Thanks [prpplague]. Because blinkey glowey projects are the best projects, [Adam] had to have one. His tests open up some interesting possibilities in the world of blinkey LED stuff, including a polar coordinate display that would be perfect for low-res games and LED clocks.
The LEDs are sequentially arranged on the DotStar disk spiraling inwards, and after mucking about with some terrible code, [Adam] realized he could control a pixel with only its distance from center and angle from the connector. This makes plotting circles easier, but it also opens this display up to some interesting applications; circular Pong would be cool, and LED clocks are the bees knees.
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