# Does a Drum Encoder exist, or Barrel Encoder?

**URL:** <https://discourse.nodered.org/t/does-a-drum-encoder-exist-or-barrel-encoder/33531>\
**Category:** General\
**Created:** [29 September 2020 23:46 UTC](https://discourse.nodered.org/t/does-a-drum-encoder-exist-or-barrel-encoder/33531 "2020-09-29T23:46:23Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Alacritous](https://avatars.discourse-cdn.com/v4/letter/a/9fc29f/32.png) [@Alacritous](https://discourse.nodered.org/u/Alacritous)\
**Post date:** [29 September 2020 23:46 UTC](https://discourse.nodered.org/t/does-a-drum-encoder-exist-or-barrel-encoder/33531/1 "2020-09-29T23:46:23Z")

</div>

Was just wondering has anyone made a drum encoder for NR yet? I don't need one. I'm just curious if it's a thing.

I used to do ladder logic programming(PTOOEY!!) and the one I used had a drum encoder built into the functionality. A drum encoder is not a rotary encoder or optical encoder. It's like a music box or a Jacquard Loom. A cylinder with pegs on it to trigger a sound(or event) in sequence and in time with other events and it repeats after a full rotation(virtually).

It's represented like this.

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/d/adecafdec6edf3a77fc407a3ed1d24b3ce5bf805.png)

As the drum turns, different contacts are triggered that would be linked to functions or anything you might want to turn on/off.

It could be timer based or each step could be triggered on demand.

Like synchronizing Christmas lights or tones as in a music box or whatever.

I did a search, but who knows what the heck someone might have called it.

Anyone?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [28 November 2020 23:46 UTC](https://discourse.nodered.org/t/does-a-drum-encoder-exist-or-barrel-encoder/33531/2 "2020-11-28T23:46:39Z")

</div>

Closed on 28 November 2020 23:46 UTC

This topic was automatically closed 60 days after the last reply. New replies are no longer allowed.