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Rotary Encoder LED Ring Breakout Board - Green

The Rotary Encoder LED Ring is a position indicator for rotary encoders. Traditional knobs with indicator lines do not give accurate representation of an encoder’s value since rotary encoders have no start or end point. The Rotary Encoder LED Ring has through-hole or shaft mounting for most standard encoders and uses a Texas Instruments TLC5925 shift register to interface 16 green LEDs to any microcontroller through SPI. A microcontroller can be programmed to output any desired sequence on the LEDs.

  • [Schematic](http://cdn.sparkfun.com/datasheets/Components/Switches/Rotary Encoder LED Ring Schematic.pdf)
  • Datasheet(TLC5925)
  • [User Guide](http://cdn.sparkfun.com/datasheets/Components/Switches/Rotary Encoder LED Ring User Guide.pdf)
  • Product Page
  • Arduino Example Code

Rotary Encoder LED Ring Breakout Board - Green Product Help and Resources

Core Skill: Soldering

This skill defines how difficult the soldering is on a particular product. It might be a couple simple solder joints, or require special reflow tools.

2 Soldering

Skill Level: Rookie - The number of pins increases, and you will have to determine polarity of components and some of the components might be a bit trickier or close together. You might need solder wick or flux.
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Core Skill: Programming

If a board needs code or communicates somehow, you're going to need to know how to program or interface with it. The programming skill is all about communication and code.

3 Programming

Skill Level: Competent - The toolchain for programming is a bit more complex and will examples may not be explicitly provided for you. You will be required to have a fundamental knowledge of programming and be required to provide your own code. You may need to modify existing libraries or code to work with your specific hardware. Sensor and hardware interfaces will be SPI or I2C.
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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.

  • NickVD / about 12 years ago / 2

    Hey everyone!
    I was lucky enough to be one of the few to beta test these for Mayhew Labs. Let me first say that while the idea is simple, the execution is amazing!
    I've put together a few videos of the rings in action which you can check out below:
    Ring used as a MIDI VU meter from Traktor
    Ring used a encoder feedback indicator
    3 Rings daisy chained together with a flashy demo

  • JoeWalnes / about 11 years ago / 1

    I have a demo and some code that shows how to drive the LEDs from a Raspberry Pi. Hope someone finds it useful.

  • Member #120290 / about 11 years ago / 1

    Does anyone know what the voltage regulator is that is shown in the schematic? For the life of me I can not find it anywhere and am needing a small SMT, low component count, 2V regulator just like it.

  • I noticed on the Mayhew Labs page for this product that they are available in Red, Green, Yellow, and Blue and are "available from Spark Fun Electronics." What happened to the yellow one? I have an application in which I want Red, Yellow, and Green ones. There doesn't seem to be a way to order them directly from Mayhew Labs, so I'm stuck.

    • I second this - I would love to have more colors. Yellow is great, but also maybe orange, white, or maybe one of the pink ones that you guys just found...

    • MarkMayhew / about 12 years ago / 1

      DClarke -
      Contact us directly and we can supply them for you. SparkFun may carry the yellow LED units in the future, but don't currently.
      Mayhew Labs Contact

      • Constantin / about 12 years ago / 1

        Hi Mark,
        Any chance that you would publish this assembly as a Eagle library file so others can incorporate your design as a drop-in assembly into their PCB designs? At least that's what I'd like to do, but the relative hole locations + sizes are not published, hence one cannot design a PCB to accept it (with standoffs and all), AFAICT, but then again, I'm a newbie so please excuse my ignorance if I missed something. Cheers, Constantin

  • ThinkerT / about 12 years ago / 1

    does this include a treadmill and Spectrum shield?

  • Nakor / about 12 years ago / 1

    Cool! I was going to design one of these but I don't see why I should bother now.

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