Which Rotary Encoders Do I need?

[Kenpilot]

I'm new to using rotary encoders and was wondering which ones I need for the Heading and Course knobs on the HSI for the A10, as well as the Attitude Indicator. I'll be using them with arduinos. Thanks! 

[Savvy]

I doesn't really matter from what I've seen. I think most of the ones I use for things like heading/course knobs are 20step encoders.

[Kenpilot]

Just now, Savvy said:

I doesn't really matter from what I've seen. I think most of the ones I use for things like heading/course knobs are 20step encoders.

Do they allow for 360 degrees continuous rotation and in either direction?

[Savvy]

Yep, they sure do.

[Kenpilot]

Just now, Savvy said:

Yep, they sure do.

Awesome, thanks Savvy! 

[No1sonuk]

I've found that when I used EC11s, I needed 0.1uF capacitors from the signal lines to ground to kill noise spikes.