“Build your own cute Spooky Scary Skeleton Robot for Halloween - Using a Raspberry Pi Pico/Pico W, HC-SR04 Ultrasonic Range finder, and an SG90 Servo
The project works in a relatively simple fashion: essentially, a Raspberry Pi Pico is charged with reading an HC-SR04 ultrasonic rangefinder. It’s all wrapped up in a 3D-printed skull-like housing. When the skeleton detects someone or something close in front, the Pi triggers a small servo hooked up to a 3D-printed gear. This interfaces with a pair of racks which drive the skull’s eyebrows up and down, and opens and shuts its jaw.
Of course, there are some major anatomical problems here. Skulls don’t have eyebrows; that’s just not possible. Eyebrows are hair attached to flesh and muscle; they simply don’t exist in the world of bone. However, it’s fair to say [Kevin]’s taking creative license for the sake of the holiday, and we can all support that.
This is a basic build, and a fun one. It would be an excellent way to learn some basic microcontroller skills, while also serving as a great little Halloween charm to scare guests going back to the fridge for another beverage.”