The creator built a neat looking project
which uses a piezoelectric element from a tweeter to detect vibrations.
He is using a Zilog eZ8 series microcontroller which seemed to be very
popular years ago.
This project dependently using a strong vibration while the enclosure has been placed on the top of vibration sensor. The LED
matrix has two eyes the wandering around effects. Whenever there is no
vibration being detected the eyes will shut down as if they were
A button was placed behind to manually switch it into various modes.
It uses a four AA batteries and can draw 150uA when asleep while it
draws for about 150mA when up.