Potentiometer with stop points?

What are the knobs called that have stopping points?

Like the source select knob on this amp: http://www.cambridgeaudio.com/media/20081014_152141_a1.jpg.

I presume they’re potentiometers rather than a switch?

sometimes its just the end of a wire spring hitting a flat spot or bump on the shaft

could be a rotary encoder, its probably a switch though

I have a load of pots like that where they have a number of stopping places but I also have some rotary switches which are (as Osgeld described), just a number of switches stuck inside a rotating thing (no need for analog reads - they can control different things on each position).

Rotary encoders generally have no stopping point, they just keep going round and round. I have one which has 8 positions which I am going to use for a menu scroller but I could, just as easily, have 8 different options and a labelled front panel to say what each position was.

Mowcius

Thanks. Do they have a special name?

I rubbish with online electronics shops and end up totally confused by all the things that're returned when I search.

Thanks. Do they have a special name?

Umm, dunno.

Multi position rotary switch? Not sure...

Mowcius

I've just got back from Maplin.

I wanted a rotary switch. :)

Oh good. I thought that's what they are called.

Mowcius

While you can get rotary switches these tend to be very clunky and require a lot of force, like this one:- http://uk.farnell.com/jsp/search/browse.jsp?N=500006+1000190&Ntk=gensearch_001&Ntt=wafer+switch&Ntx=mode+matchallpartial

Where as you can get rotary encoders with click stops like this:- http://www.potentiometers.com/alpsencoder.cfm The clicks type are known as 'dents' short for indentations. These tend to have a very nice feel.

The clicks type are known as ‘dents’ short for indentations. These tend to have a very nice feel.

Actually, they are known as “detents”:

Call them what you want…

:sunglasses:

Thanks both. Those with the dents do look much better, but as this is my first boxing up of a project I don't need a perfect finish.

I couldn't find the right sized bolts to mount the lcd, and I've no idea how I'll make a bezel. But at least I know what to look for next time :)

I couldn't find the right sized bolts to mount the lcd, and I've no idea how I'll make a bezel. But at least I know what to look for next time.

If it's a standard 20x4 or 16x2 then they are often M2.5s. I often use M2s though because the head is slightly smaller and for that reason, slightly more discrete.

Those with the dents do look much better, but as this is my first boxing up of a project I don't need a perfect finish.

Well that is normally governed my what knobs you stick on them. I have seen a load of nice ones of them...

If you are looking for a bezel then that is what I do! take a look at http://www.duinoaday.wordpress.com for an idea of a few things I have cut. I can do pretty much anything out of acrylic. With etched labels etc if required.

Mowcius

3mm was the smallest B&Q had (or at least that I saw). Ta for the info, at least I know what to look for now.

I had a look at your site the other day. I’m not exaclty sure what I want at the moment. Do you do custom stuff then?

I had a look at your site the other day. I'm not exaclty sure what I want at the moment. Do you do custom stuff then?

I can do custom stuff but not commercially so I do not advertise that fact. PM me if you're interested. Fellow arduino users are on my list of people I will do custom work for though ;)

Sorry for the lack of info on my 'proper site' as to what I can do (the store page still being down and all). It is getting there slowly.