Circular LED Bargraphs - Green

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 green 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 Green LEDs
  • Max Forward Voltage: 3.6V
  • Dominant Wavelength: 535nm
  • Continuous Forward Current: 25mA

Circular LED Bargraphs - Green 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?

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  • Nikarus / about 10 years ago / 2

    SO I wonder, are we ever going to see a version of this with RGB LEDs installed? For example, make a temp gague or something, and as it heats up colors shift from blue to green to yellow to red to flashing or other silly things like that.

    • MikeGrusin / about 10 years ago / 1

      We'd love that too, and are actively looking for such parts. If you know of any, let us know!

  • Thetinkerer / about 9 years ago / 1

    Is there EVER going to be a 12 led version?

    • Kamiquasi / about 9 years ago / 1

      As per Mike's.. just use 2 LEDs (appears as 4 bars), or 1 of 2, for e.g. the 3, 6, 9 and 12 hours, you can place a custom mask over top to make it appear as being 12 segments. (As it is, this mask has 32 segments)

      I did start design on a circular LED assembly once, allowing various configurations (multiples of 3, 4 and 5, specifically) and an open center (space for uC, rotary encoder, etc.) to be soldered by hand, but never finished it. My backlight just died, so I'm not likely to finish it now, either :) Getting it manufactured in quantity would be a bigger challenge.. Soldering teensy SMD LEDs by hand gets tedious. Maybe once things are up and running again.

      There's probably some cheap 12-LED watches available for cheap somewhere that you might be able to yoink the display from, too.

    • MikeGrusin / about 9 years ago / 1

      Not unless we find that part. :( But these do work nicely for clocks, they just are on 16 divisions instead of 12.

      • What about something like this one by Seeed? (24 white SMD leds, no mask)

  • Member #439309 / about 9 years ago / 1

    holly ROCK AND ROLL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !

  • 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?

  • Thetinkerer / about 10 years ago * / 1

    What is the current draw of this with all the leds on, does each led add 25ma draw? aka, would all of them on draw 400ma?

  • Thetinkerer / about 10 years ago * / 1

    I really wish the pins were breadboard compatible. If there are pcbs with the zig-zag
    kind of hole arrangement, please let me know.

    • MikeGrusin / about 10 years ago / 1

      You mean like these?

      • Thetinkerer / about 10 years ago / 1

        Ideally what I need is a square pcb with the outside pins in the zig zag configuration and the middle normal.

        • Thetinkerer / about 10 years ago / 1

          I could probably just make it myself, thanks for the help!

      • Thetinkerer / about 10 years ago / 1

        Yeah, sort of. Just the whole board is zig-zag shaped like this pcb.

        • Thetinkerer / about 10 years ago / 1

          Nevermind, then the other stuff I need soldered wouldn't fit.

  • PhredPhidgets / about 10 years ago / 1

    This is awesome! I like the fact that the LEDS are individually addressable - I've been wanting to make a solid-state version of a tuning eye tube.

Customer Reviews

4 out of 5

Based on 1 ratings:

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Works Well, Pins are Fragile

The circular bargraph is working well for me. However, the pins are really flimsy - if you wiggle them too much, they can snap right off.

Also, I wish the divisions actually matched the # of LEDs. It seems really silly that there are 16 LEDs but 32 segments.