By the early 20th century, naval warfare was undergoing drastic technological changes. Ships were getting better and faster engines and were being outfitted with wireless communications, while naval aviation was coming into its own. The most dramatic changes were taking place below the surface of the ocean, though, as brave men stuffed themselves into steel tubes designed to sink and, usually, surface, and to attack by stealth and cunning rather than brute force. The submarine was becoming a major part of the world’s navies, albeit a feared and hated one.
For as much animosity as there was between sailors of surface vessels and those that chose the life of a submariner, and for as vastly different as a battleship or cruiser seems from a submarine, they all had one thing in common: the battle against the sea. Sailors and their ships are always on their own dealing with forces that can swat them out of existence in an instant. As a result, mariners have a long history of doing whatever it takes to get back to shore safely — even if that means turning a submarine into a sailboat.
Continue reading “Hacking When It Counts: Setting Sail In A Submarine”
The ability to build a robot to take care of a tedious task for you is power indeed. For a few centuries, the task of helping determine one’s location fell to the sextant. Now, you can offload that task to this auto-sextant, courtesy of [Raz85].
To be clear, this robo-sextant doesn’t give you your exact location, but it does find and display the bearing and altitude of the most luminous object around and display them on the LCD — so, the sun and moon. A pair of cheap servos handle the horizontal and vertical movement, an Arduino Uno acts as the brains and nervous system, and a photoresistor acts as the all-seeing eye. Clever use of some cardboard allow [Raz85] to keep the photoresistor isolated from most all light except what the sextant is currently pointed at. Servos have a limited field of movement, so you might need to adjust [Raz85]’s code accordingly if you’re rebuilding this one yourself.
After taking three minutes to make its rounds of the sky, the Uno records the servos’ positions when fixed on the sun or moon, translating that data into usable coordinates. Don’t forget the best part, it runs on batteries making it convenient for all your wave-faring excursions!
Continue reading “Finding The Sun And Moon The New Old-Fashioned Way”