This circuit uses a thin piezoelectric sensor to sense the vibrations generated by knocking on a surface; eg, a door or table. Basically, it amplifies and processes the signal from the sensor and ...

We’re always looking for more ways to make our office fun and strange. I don’t often work with my door closed, but the majority of time when someone comes into my office, they give the door the ...

Clicking a button to turn on your computer isn't particularly difficult, but if you're looking for a more personalized way to turn your PC on, Code and Life shows off how to turn your computer on with ...