Nifty LED products (37 LED hex panels)

My goal is to empty @jeff’s wallet at a distance and also spur him and others to make beautiful items. Oh and I’ll probably buy some of these too… If you find a cool LED item, please share.

I’ll start:

HEX RGB LED Board (SK6812) | m5stack-store

Slightly bigger than 1 inch (30mm edge to edge, 35mm corner to corner), this 37 led Hexagon looks like it would be fun. At under $4 (currently on sale less, $4 at AliExpress, more expensive from banggood), imagine a few of these twirling… The ring layout 1-6-12-18 (but not wired that way, it is in series, left right top to bottom…) is pretty compact so I suspect it’ll look good. Hexes tile well but don’t do 3D shapes (so no cool easy polygons)

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That price is pretty insane. A lot of the m5stack stuff is, and I think it must be heavily subsidized or operating at a loss.

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I bought (at more expensive prices from Amazon, but way faster) some of the Atom items. The Atom Matrix with a 5x5 led matrix on top and acceleramator (and the main button to press is underneath, so you push down on the display) is quite nice. The Atom Echo speaker sucks and is tinny though, so not recommended.
I’m considering getting some Atom Lites to drive LEDs in as small (and cheap) a package as possible.

I also got a M5StickC Plus, which is quite amazing, loaded with an 1.4inch TFT 135x240 screen, mic, rtc, battery 120mah, acceleramator (IMU), and more. All on top of a Pico ESP32.

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Let’s see… 37*7 is 259 LEDs which if you mount 6 around 1, would be slightly less than 4 inches wide/tall… Not nearly as big as the Polar Star but about the same number of pixels…

@jeff Did you ever do anything with these?

I just got a shipment I ordered, 25 of them (they had a sale again), and now imagining what to do with them… they will tile well (I bought enough to do a Catan style layout - 19 in a circular hex shape, plus some extras), or maybe a soccer ball of 20 (aka a truncated icosahedron). 37x19 = 703 pixels… in maybe 6 inches round? A soccer ball would under 4 inches round, for 740 pixels, but of course it would have big holes where the pentagons would go.

I need to print some mounting stuff, thinking about using something like these: https://www.thingiverse.com/thing:208591
which would let me adjust and reconnect as desired.

@Scruffynerf I have 6 right next to me but haven’t had time to do anything with them yet! Lemme know what you find in terms of power, timing, color, etc!

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Recording this so I don’t forget this great resource:

Loaded in JavaScript-y code for hex coordinates

Which thankfully, PB will handle as a XYZ done right, making yet another coordinate system it can do.

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Hooked them up. Pretty fun - I think we have some Halloween possibilities.

  • 37 SK6812 in GRB order
  • 3535 package, 5mm pitch
  • 12ma per color / 36ma per pixel

Map:

function (pixelCount) {
  var map = []
  const hexCount = 1 // However many you're hooking up; z will consistent per panel, as if in layers.
  const hexRows = [4, 5, 6, 7, 6, 5, 4]
  
  Array.from({ length: hexCount }, (element, hexIndex) => {
    hexRows.forEach((cols, row) => {
      for (i = 0; i < cols; i++) {
        y = row;
        xOffset = 7 - cols * .5; // 7->0, 4->1.5
        x = xOffset + i;
        map.push([x, y, hexIndex]);
      }
    });
  });

  return map
}
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WOW @Scruffynerf that is an very cool website. Now I’m curious if someone has made stl plans for a isohedron using 3d printing as the holder and those 37 led hex panels inserted into the faces. That would make a rad hanging “disco ball”.