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I'm working on an interface to control a variable-brightness LED. The obvious choice to me is to use something like a slider. The LED can be adjusted within the GUI or externally, so I need to allow the user to change to setting, and also display the current setting, so it seems like a slider is not the ideal in that regard.

What are some approaches that have been used to display input and output at the same time in a slider format? What would be a good way of approaching this problem?

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Do you really need to see the current position, or just cater for the possibility that it could be set from another interface? Is it relevant to show the current position at all, or is it just the ability to alter the brightness that is needed? –  Babossa Jun 2 at 21:28
    
Why not bind the slider position to the actual value, then the user can change the value and see it change immediately in GUI when changed via other (non graphical) UI? –  Danny Varod Jun 3 at 0:52
    
If you look at some of the audio controls, they also use the slider with the control bound to the current value. I think the analogy is similar enough that users will understand. You can also reference mobile phone light controls. –  Michael Lai Jun 3 at 22:33
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