How many servos is too many?

**I apologize if I posted this in the wrong forum, I am unsure where to ask this question.

I am attempting to make a MIDI piano where the user could experience different styles of keyboards through changes in key-weights. To accomplish this, I was considering using servos/motors to apply resistance to each key via the Front Rail Pin (#4 on the diagram), similar to how the PS5 controller triggers work. Is this impractical to have one motor/servo for each individual key? Are there any alternatives to dynamically add resistance for when a user presses down on the key other than supplying 36-something motors/servos?


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My idea is probably not the best at all, but it is better than having 36 servos.

Add a potentiometer where the key would usually rotate to see the amount of force applied (by calculating the pot’s value) and maybe a spring underneath it to return it to its original position. This way you are using less power and it’s easier

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Welcome donjuanvaughn, you post an interesting question. This is done on the better keyboards (music) all the time. Try this link to get started: What Our Switch Testing Machine DOES Measure I know this does not answer your question completely but it should help.

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If you want all the keys to change together, perhaps a single bar carrying springs for each key.

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Thanks MarkT for your reply!
I was thinking sort of the same thing. My concern was if the user applied too great of a force that would offset the bar and what supports it. Maybe adding a ratchet that locks at certain heights as well?

Good point, there might be Boogie Woogie players around :slight_smile:

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