5. Indoor Autonomy
Inside, GPS is unreliable, and a slammed door is enough to throw off the barometric sensor, so Drone relies on other techniques. A sonar constantly pings the floor, gauging the drone’s height, and five infrared transceivers bounce signals off the walls and ceiling. The device’s micro-controller parses this data a thousand times per second to determine whether Drone is in the right position—or heading for a wall.