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.
Geography of robotics
Robots of the United States include simple household robots such as Roomba to sophisticated autonomous aircraft such as the MQ-9 Reaper that cost 18 million dollars per unit. The first industrial robot, robot company and exoskeletons as well as the first dynamically balancing, organic, and nanoscale robots originate from the United States.