Page 101 - Concise Encyclopedia of Robotics

Electric Eye
Electrode
array
Conductive
foam + – Battery
Electrode Current
array sensors

ADC

Microcomputer

Elastomer

being compressed.The data is sent to an analog-to-digital converter (ADC)
and then to a microcomputer, which determines where the pressure is
taking place, and how intense it is.
See also TACTILE SENSING.

ELECTRIC EYE
An electric eye optically senses an object and then actuates a device. For
example, it might be set up to detect anything passing through a doorway.
This can count the number of people entering or leaving a building.
Another example is the counting of items on a fast-moving assembly
line; each item breaks the light beam once, and a circuit counts the
number of interruptions.
Usually, an electric eye has a light source and a photocell; these are
connected to an actuating circuit as shown in the block diagram. When
something interrupts the light beam, the voltage or current from the
photocell changes dramatically. It is easy for electronic circuits to detect

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