Analog robot
An analog robot is a type of robot which uses analog circuitry to go toward a simple goal such as finding more light or responding to sound. The first real analog robot was invented in the 1940s by William Grey Walter. The name of these robots were ELSIE and ELMER (Electro Mechanical Robot). The original circuitry was developed using two vacuum tubes and a photocell to search and follow a light. Recently a kind of analog robots was developed by Mark Tilden.
Leonardo's robot
Leonardo's robot, or Leonardo's mechanical knight (Italian: "Robot di Leonardo" or "Automa cavaliere", lit. "Automaton knight") , was a humanoid automaton designed and possibly constructed by Leonardo da Vinci around the year 1495.