how i automatically engage & disengage clutch & brake in gearbox?

Means , if i want 2 speed in planetary gearbox & then i got 1st speed when i fixes the arm & i got 2nd speed when i fixes ring gear. so, how i automatically shift gear from 1st gear to 2nd or from 2nd to 1st?
is there possible with the help of speed sensor? Means if our cut-off is 2000 rpm then if speed is greater than 2000 rpm, 2nd speed is in working & when less than 2000 rpm, 1st gear is in working? how its possible?

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