We’ve of course seen many designs here at Hackster, but perhaps none as creepy as this articulated skull clock. The device is formed from a store-bought plastic skull model, along with a matching jaw. While simulated flesh is missing everywhere else, its eyes are actually very well preserved, complete with irises and red blood vessel lines that make them appear even crazier than normal.
These intact eyes are, in fact, integral to the build and rotate according to the time like the hands of a traditional analog clock. One eyeball signifies hours, while the other minutes under control of a pair of 360° servos (not continuous rotation). This would be creepy enough by itself, but the jaw is hinged, and opened by another servo, then pulled shut by a spring assembly. This allows it to “clack” away to indicate that another hour has passed.
The project is controlled by an Arduino with a DS3232 RTC module to keep track of time. Code is available on Pastebin. In addition to the core electromechanical parts, a nice octagonal clock body is constructed out of wood, making it something that can be prominently displayed around mid-October, or be kept out all year long if you need a little jolt to tell you what time it is!