This project uses small quadcopter drones, open-source research platforms known as Crazyflies, which are light enough to fly safely inside an ordinary room. Since GPS is unavailable indoors, position has to be established by other means, and these drones rely on a room-tracking system called Bitcraze Lighthouse. Small base stations mounted around the flight area, originally developed for virtual-reality headsets, sweep invisible infrared light across the space, while a receiver board on each drone detects these sweeps and computes its own position onboard many times per second. With four base stations placed around the room, the same calibrated setup can track a single drone or a small group.