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what is creating the vibration of vibrobot? Answered

           It the load of coin cell or uses the energy of lithium battery.

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the create the vibration is the motor that has circle with load
when spin the motor it creates vibration because of circle with load.

a motor with an unbalanced weight on the shaft.

https://www.instructables.com/id/Itty-Bitty-Vibrobot/