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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
user81569
@allObjects
...take a look at the links found in here.
To get started, you connect an ear bud with a resistor...
Readily and cheap vibration motors - such as found in cell phones - draw quite a lot of power: ~70mA... There are better ones around, but still the 'vibe force' is defining the power consumption: Datasheet for KOTL Low Power Vibration Motors.