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Circular LED Bargraphs - Blue

These circular LED displays are a lot of fun. Essentially, these are what you would get if you could 'wrap' one of our LED bargraphs around a circle. They consist of 16 blue LEDs arranged so that each quarter of the circle has a common ground and four anode pins, resulting in 20 pins total on the device. Because they're simply a bunch of cleverly packaged LEDs, they're just as easy to use as our LED bargraphs. These are great for indicating the position of a rotary encoder!

  • 16 Blue LEDs
  • Max Forward Voltage: 3.0V
  • Dominant Wavelength: 465nm
  • Continuous Forward Current: 30mA

Circular LED Bargraphs - Blue Product Help and Resources

Core Skill: Electrical Prototyping

If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.

3 Electrical Prototyping

Skill Level: Competent - You will be required to reference a datasheet or schematic to know how to use a component. Your knowledge of a datasheet will only require basic features like power requirements, pinouts, or communications type. Also, you may need a power supply that?s greater than 12V or more than 1A worth of current.
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Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • TWRackers / about 7 years ago / 2

    I feel like I've been cheated. I bought two of these in blue and two in red in January, and didn't discover until they arrived that they have a completely useless pinout if you're restricted to 0.1" grids... and this weekend I learned that the breakout boards are discontinued. I don't have the facilities to use the Eagle files or anything else to have custom PC boards made, so I've got $40 worth of hardware I cannot use.

    Why on earth would you continue selling these without putting on the description above BREAKOUT BOARD NO LONGER AVAILABLE?

    • M-Short / about 7 years ago / 2

      Sorry about that. The LEDs are actually being discontinued and so we flipped the switches to stop buying the entire line. It looks like we just ran out of the breakout boards first. I'll look into bringing the board back for a limited time

      • TWRackers / about 7 years ago / 2

        That would be very good if you can do that. If you've got 250+ of the blue ones (haven't checked the red ones today), there's got to be some demand for the breakout boards. Maybe that will help you sell off the remaining bargraphs quicker? I'd even consider getting some of the encoders and knobs to go with the bargraphs. ^_^

  • MDGeist / about 7 years ago / 1

    Hi there, I am thinking of picking a couple of these up, but I can't find the red board as shown in the last picture. Can someone point me towards it?

    • It's actually been retired from our catalog, but if you'd like to reference the datasheets (or use the Eagle files to build your own version), you can find all of that here.

      • MDGeist / about 7 years ago / 1

        OKay, thanks, but it seems weird to me that you have about 800 red and blue combined of these, but you retired the red board that allows you to use this product??

        • While I agree that does seem very strange, the breakouts simply didn't sell to a point that justified keeping them in the catalog. The LEDs themselves do sell however, so it's likely that the customers buying them are using them in custom applications where the breakout board is not needed. It's hard to predict what folks will use, and what they won't :/

  • jonesinator / about 7 years ago / 1

    Would be nice if the serial data output pin on the second shift register was broken out so the board could be daisy chained with other shift registers. One can solder a jumper wire to the pin on the chip itself in order to do this fairly easily, but it would still be nice to have a pin on the board to accomplish the same thing.

  • v8media / about 8 years ago / 1

    How you would use this with a front panel for a project? Would you cut out a circle to show the ring and have the slightly raised circular plastic set beneath the panel? It seems you'd be stuck then having the potentiometer completely exposed like on that red board. I really like the idea, but I'm having trouble thinking how to use this in a finished way.

    It would be great to have a combo of the RGB encoder and the ring LEDs but with a finished center, so that you couldn't see the business end of the encoder. Hmm, or maybe 3d print a black cap for the center that snaps onto the open spaces on the edges of the encoder?

    Also, the last photo shows the little breakout board to mount this and the rotary encoder. Is this a purchasable part? Or does it come with the circular LEDs?

  • Member #451179 / about 9 years ago / 1

    This would be an even better product if the colours went from red to green! Any chance of this? Or is it possible to replace the existing LEDs for custom colours?

    • Kamiquasi / about 9 years ago / 1

      is it possible to replace the existing LEDs for custom colours?

      Not really - it's not discrete LED components underneath the segments, but dies and bonds straight onto the board.

      This would be an even better product if the colours went from red to green! Any chance of this?

      The company that makes them seems to allow them to be produced with one of four colors (red/orange, yellow, green and blue - ah, if only they offered white) for each quadrant. But whether they stock that configuration, and how much it would cost to get that (either piecewise or for SparkFun to get a bunch in one go) is not mentioned. If you've got a steady hand you could splice a red and a green together to your desired configuration ;)

      Alternatively, you could check out the Rotary Encoder LED Ring Breakout Boards. Those do use discrete LED components that you could swap out.

  • Someone tell me how to right one of these up to a mini photocell or lilypad light sensor so that it roughly measures the amount of light coming in. Is it possible?

  • Member #383166 / about 10 years ago / 1

    How good of a Arc Reactor would this make?

    • Kamiquasi / about 10 years ago / 1

      I'm assuming you mean the chest piece. It would make for a very small one; check the image with the rulers. You'd also have to add appropriate masking to get the design of arc reactor you'd be after (Mark II has 10 sections, for example - you could only get 8 disparate sections with this bar graph, so instead you'd have to light all 16 up and block unwanted areas instead).

      • Member #383166 / about 10 years ago / 1

        Haha, I can always trust people on Sparkfun to give me a logical answer. I was mostly kidding, although I was thinking about making one with Arduino Lilly pad components.

  • I just received a blue one. It has 32 leds and they seem to light up in pairs. A common anode version would be more interesting so I could drive it with a shift register. Still, I really like it when you come up with products like this. Keep up the good work.

    • stevenvh17 / about 8 years ago / 1

      It has 16 LEDs, as you can read in the description and on the mechanical drawing. It's just that each LED has 2 windows. A pity, I would have loved a 32 LEDs version.

    • MikeGrusin / about 10 years ago / 1

      You should still be able to drive it with a shift register (see the RingCoder breakout below); you'll just need to drive the register output to the opposite state.

  • MoriFi / about 10 years ago / 1

    I see a direction indicator for a homebrew antenna rotor coming up.

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