Classification of Robot Sensor: Robot Sensors senses and capability includes vision and hand eye coordination, touch, hearing, sensors will divided into the following categories.
[1] Vision Sensor: Robot vision is made possible by means of video camera, a sufficient light source and a computer programmed to process image data. The camera is mounted either on the robot or in a fixed position above the robot so that its field of vision includes the robots work volume.
[2] Tactile Sensor: Tactile sensors provide the robot with the capability to respond to contact forces between itself and other objects within its work volume. Tactile sensors can be divided into two types:
2.1 Touch Sensor is used simply to indicate whether contact has been made with an object. A simple micro switch can serve the purpose of a touch sensor.
2.2 Stress Sensor is used to measure the magnitude of the contact force. Strain gauge devices are typically employed in force measuring sensors.
[3] Proximity Sensor: They are used to sense when one object is close to another object. On a robot, the proximity sensors would be located on or near the end effectors.
[4] Voice Sensor: Voice programming can be defined as the oral communication of commands to the robot or other machine. The robot controller is equipped with a speech recognition system which analyzes the voice input and compares it with a set of stored word patterns. When a match is found between the input and the stored vocabulary word the robot performs some actions which correspond to the word.