This project is basically a stick that shakes with a fake pig tail. I recently took apart my old talking stuffed animal toy called Piggy Says. It was an interactive game based on Simon Says. I wanted to reuse parts of it, such as the switch in its tail and the vibration motor that made it seem like it was laughing. The 3 AA battery compartment was from another toy I took apart, because the one from Piggy Says was corroded. The switch was designed to signal an integrated circuit which means it can't handle much current. That's why I added a MOSFET which can handle a higher current. I put a capacitor across the motor to protect the MOSFET from inductive spikes. I added a pull down resistor on the MOSFET to prevent it from turning half on which would cause it to get hot.
|The motor with unbalanced weight.|
|MOSFET with heat sink (which wasn't really necessary)|