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PROJECT BASICS
POWER SUPPLY
SENSORS
INTRODUCTION
LIGHT SENSOR
LDR
PRESSURE SENSOR
RELAY
CURRENT BUFFER
BIDIRECTIONAL CURRENT BUFFER
PARALLEL PORT
LEVEL SHIFTER
WIRELESS COMMUNICATION
PROJECT IDEAS
 

 

 

LIGHT SENSOR

The light sensor is used to detect the presence of light. The light sensors are of two types:

  • Photovoltaic sensor
  • Photo Conductive sensors

The photovoltaic sensors are those which produce electricity when light fall on them. Their response time is less but the relation between voltage produced and the light intensity is proportional while the photo conductive sensors are whose resistance changes when light falls on them. Their response time is less but the relation between the resistance and the light intensity is linear. Hence it is easier to manipulate photo conductive light sensors e.g. LDR. Next we discuss some of those sensors:

 

 


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