Embedded Sensor – Proximity

Real Time Usage of Proximity Sensor

On Mobile

           Proximity sensor installed on the front of an iPhone 5 next to the earpiece automatically turning off the touchscreen when the sensor comes within a predefined range of an object (such as a human ear) when using the handset.

See Image : https://en.wikipedia.org/wiki/Proximity_sensor#/media/File:Proximity_sensor_on_iPhone_5_front.png


On Parking Sensor

Ultrasonic parking sensor : Source

Parking sensor on a fender




Type of Proximity

  • Capacitive Proximity Sensors
  • Inductive Proximity Sensors
  • Magnetic Proximity Sensors
  • Optical Proximity Sensor
    • Photoelectric
    • PhotoCell
    • Infrared Proximity Sensor (Passive Thermal)
  • Ultrasonic Proximity Sensor
  • Hall Effect proximity Sensor


Proximity Application

  • Parking sensors, systems mounted on car bumpers that sense distance to nearby cars for parking
  • Ground proximity warning system for aviation safety
  • Vibration measurements of rotating shafts in machinery
  • Top dead centre (TDC)/camshaft sensor in reciprocating engines.
  • Sheet break sensing in paper machine.
  • Anti-aircraft warfare
  • Roller coasters
  • Conveyor systems
  • Beverage and food can making lines
  • Improvised Explosive Devices or IEDs
  • Mobile devices
    • Touch screens that come in close proximity to the face
    • Attenuating radio power in close proximity to the body, in order to reduce radiation exposure
  • Automatic faucets


Other Proximity Sensor

PRD-12-8DP Inductive Proximity Sensor


  • Types NPN
  • Type : PNP
    • Data Sheet : Inductive Proximity Sensor Detection Switch PNP Model: LJ12A3-4-Z/BY
    • Specification :
      • A component widely used in automatic control industry for detecting, controlling, and non-contact switching When proximity switch is close to some target object, it will send out control signal.
      • Model: LJ12A3-4-Z/AY
      • Output Type: PNP NC(Normally Close)
      • Detecting Distance: 4mm±10%
      • Theory: Inductive Sensor
      • Wire Type: 3 Wire Type (Brown, Blue, Black)
      • Switch Appearance Type: Cylinder Type, Aluminum Shell
      • Supply Voltage: DC 6-36V
      • Current: 200A
      • Detect Object: Iron
      • Diameter: 12mm
      • Cable Length: 1M/3.3Ft
      • 1 x Inductive Proximity Sensor Switch
    • Price Approximately :340rs (India)


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