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Description: 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!

Features:

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

Documents:

Comments 9 comments

  • 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?

    • 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?

  • How good of a Arc Reactor would this make?

    • 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).

      • 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.

    • 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.

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


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