Multiple flipflop (piano switch)

[GrahamR]

Hi all.
I thought this would be a straightforward development from a "two-key piano switch", ie an ordinary flipflop, but it's got me baffled, which admittedly doesn't take much.
I can't find anything online. Is it so easy that nobody's bothered posting it? Or am i searching for the wrong thing?
Thanks very much,

 

[Nigel Goodwin]

I've not got a clue what you're asking, I'm not surprised google doesn't help - EXACTLY what are you trying to do?.

 

[Ian Rogers]

A piano switch is normally an on off affair. ( basically a row of switches that look like a piano)

I take it you are attaching to logic to toggle when operated. is this what you are looking for?

 

[GrahamR]

Ok, maybe I'm showing my age.

Do you know those mechanical multi-button switches you used to get on radios etc for MW, LW, VHF...? You pressed one button down and the previous one popped up, and so on? They were colloquially called "piano switches". I don't know their actual name, if they had one.

I'm thinking of an electronic version. Obviously an ordinary flipflop will do the same thing as a two-button one. You "press" one side, electrically, and that side stays high while the other side goes low, and vice versa.

I'm trying to think of a "multi-button" flipflop, where "pressing" any stage sends that output high whilst lowering all the others.

Is that clearer?

Thanks,

 

[Nigel Goodwin]

Ok, maybe I'm showing my age.

Do you know those mechanical multi-button switches you used to get on radios etc for MW, LW, VHF...? You pressed one button down and the previous one popped up, and so on? They were colloquially called "piano switches". I don't know their actual name, if they had one.

I'm thinking of an electronic version. Obviously an ordinary flipflop will do the same thing as a two-button one. You "press" one side, electrically, and that side stays high while the other side goes low, and vice versa.

I'm trying to think of a "multi-button" flipflop, where "pressing" any stage sends that output high whilst lowering all the others.

Is that clearer?

Thanks,

As far as I'm aware they have never been known as 'Piano switches', as they have no relation to how piano keys work - they are known as 'radio switches', and are even called that in Delphi and Visual Basic etc.

As soon as you use the correct name, loads of options pop up:

Electronically Interlocking Radio Buttons (*improved!*)

Electronically Interlocking Radio Buttons (*improved!*): The term "radio buttons" comes from the design of old car radios, where there would be a number of push buttons pre-tuned to different channels, and mechanically interlocked so that only one can be pushed in at a time. I wanted to find a...

www.instructables.com

It could be done with flip flops, and would have been decades ago, but in any remotely modern times a micro-controller makes far more sense.

 

[Ian Rogers]

How many buttons? it would be easier with a parralel load shift register

The old radio buttons were mechanical.. Ali express even calls them Piano switches. LOL

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