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.
History of robots
Among the first verifiable automation is a humanoid drawn by Leonardo da Vinci (1452–1519) in around 1495. Leonardo's notebooks, rediscovered in the 1950s, contain detailed drawings of a mechanical knight in armour which was able to sit up, wave its arms and move its head and jaw. In 1533, Johannes Müller von Königsberg created an automaton eagle and fly made of iron; both could fly. John Dee is also known for creating a wooden beetle, capable of flying. 
The 17th century thinker Rene Descartes believed that animals and humans were biological machines. On his last trip to Norway, he took with him a mechanical doll that looked like his dead daughter Francine. In the 18th century the master toy maker Jaques de Vaucanson built for Louis XV an automated duck with hundreds of moving parts, which could eat and drink. Vaucanson subsequently built humanoid automatons, a drummer and fife player were noted for their anatomical similarity to real human beings. Vaucanson's creation inspired European watchmakers to manufacture mechanical automata and it became fashionable among the European aristocracy to collect sophisticated mechanical devices for entertainment. In the 1770s the Swiss Pierre Jaquet-Droz created moving automata that looked like children, which delighted Mary Shelly, who went on to write "". The ultimate attempt at automation was The Turk by Wolfgang von Kempelen, a sophisticated machine that could play chess against a human opponent and toured Europe. When the machine was brought to the new world, it prompted Edgar Allan Poe to pen an essay, in which he concluded that it was impossible for mechanical devices to reason or think.
The Japanese craftsman Hisashige Tanaka, known as "Japan's Edison", created an array of extremely complex mechanical toys, some of which could serve tea, fire arrows drawn from a quiver, or even paint a Japanese "kanji" character. The landmark text "Karakuri Zui" ("Illustrated Machinery") was published in 1796.