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what is creating the vibration of vibrobot?

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

Picture of what is creating the vibration of vibrobot?
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.
kelseymh6 years ago
https://www.instructables.com/id/Itty-Bitty-Vibrobot/