If I solder as shown in the picture and run the Basic code provided in the library, will the vibration work smoothly?
Power supply is connected to the PC via a C to C cable.
HI there,
SO , Yes… That should work fine. Both are 3.3 v devices. as long as the vibration motor is the right range for the board . everything should work. 
HTH
GL 
PJ 
Thank U, I did as you said and it works perfectly.
But if I connect it to the lithium polymer battery instead of the PC with a C-to-C cable, can I turn it off?
If I connect it with a C-to-C cable, I can simply unplug it, but I plan to solder the lithium polymer battery.
HI there,
Great to hear,
DO us a solid and Mark it as the solution 
So others can find it fast
You would need a switch, or Arduino Code to Deep sleep it and only wake up with a press of the reset button or motion in the case of a Sense version of the MCU…
Most folks go for the switch
HTH
GL PJ
