load coefficient in micro

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ali_th

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I made a device with micro. in this device user can load some coefficient in micro in step size, for example user can load 1 , 10 , 100 , ... for set coefficient a in y=ax. what is your suggest for a good devise for loading this coefficient?
Keypad is very big in my devise.

Added after 7 minutes:

My friend suggest me volume controller in cosset player, these devises work like an encoder, I think it is good ideas but don’t how do they work?
thanks
 

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