This device is a balcony sentinel. The Raspberry Pi keeps a constant watch, snapping a photo the moment it detects any disturbance. Images are instantly uploaded to the cloud, where the popular YOLO model analyzes them. Is it a bird? If so, its coordinates are sent back. From detection to identification to firing decision, the whole process takes just 500 milliseconds—faster than a pigeon’s reaction time. It then automatically calculates the angle, adjusts the turret, aims, and fires in one seamless motion. What it targets isn’t the bird itself, but its courage. A small, precise, and harmless jet of water is enough to make pigeons feel that this place has bad feng shui. You can also monitor the feed and review past incidents anytime via your smartphone. If you have the skills, you can retrain the backend model to recognize cats and dogs, or even detect whether a child is sitting properly while doing homework. The essence of this project lies in using heavyweight AI vision technology to solve the lightweight nuisance of pigeons causing trouble. This mismatch—like using an anti-aircraft gun to swat a mosquito—is precisely the romance of maker culture. With some plastic, a development board, and a few lines of code, you can create your own quiet, sovereign corner. The most hardcore form of comfort is telling the world that even pigeons must follow the rules on my turf. I’m Lao Li, a seasoned enthusiast. Follow me to embark on the romantic journey of making.