Jacek Fedorynski has recently created an air mouse, a device that attaches to a hat and functions like an actual mouse. Hat mouse, you ask? Instead of controlling it with hand movements, it requires you to use your head. Based on Adafruit’s Feather nRF52840 Sense, this air mouse works by reading accelerometer, gyroscope and magnetometer data, and connects via Bluetooth to run on Windows, Mac and Linux.