Walmart isn’t known for their scary Halloween decorations, but that doesn’t mean they can’t ‘become’ scary. That’s the idea that software engineer Charles Wolfe had in mind when he designed his animated doorknocker using a 5-buck decoration and a Digispark development board. To get the knocker to look and function as something the Addams family would have, Charles cut the eyes out of the plastic face and inserted a pair of RGB LEDs to give it a more frightening look.
On the opposite side of the monster’s mouth is a small servo that actuates the doorknocker, which is all controlled by a Digispark development board. In fact, even an Arduino board can be used as long as it’s small enough to fit inside the plastic head. While this may be enough to scare some kids this Halloween, Charles plans on upgrading it to scare the kids next year (who may have caught on that it’s not exactly possessed) with a motion sensor and scary sound via a Bluetooth connection. See more about this project, and to build one yourself after this link.