Category Archives: Embedded Sensors

Embedded Sensor – Smoke

A smoke sensor is a device that senses smoke, typically as an indicator of fire. Commercial and residential security devices issue a signal to a fire alarm control panel as part of a fire alarm system , while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself. The Analog Smoke/LPG/CO  G as Sensor (MQ2) module utilizes an MQ  -2 as the sensitive component and has a protection resistor and an adjustable resistor on board. The MQ-2 gas sensor is sensitive to LPG, i-butane, propane, methane, alcohol,Hydrogen and smoke. It could be used in gas leakage detecting equipments in family and industry. The resistance of the sensitive component changes as the concentration of the target gas changes.


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 :


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)


Embedded Sensor – NTC Temperature

Thermistors are temperature-sensing elements made of semiconductor material that has been sintered in order to display large changes in resistance in proportion to small changes in temperature. This resistance can be measured by using a small and measured direct current, or dc, passed through the thermistor in order to measure the voltage drop produced. These solid state temperature sensors actually act like electrical resistors that are temperature sensitive. That is where the name, a clear combination of the words thermal and resistor, comes from. Ametherm specializes in NTC, or negative temperature coefficient, thermistors.


Embedded Sensor – Passive Infrared Sensor (PIR)


  • PIR – Passive InfraRed Sensor
  • PIR consists of a Pyroelectric sensor which generates energy when exposed to heat.
  • The module covered with Fresnel Lense Cover.
  • BISS0001 micro Power PIR Motion Detector IC.




  • Passive Infrared Detector for Anti Theft security alarm system.
  • Passive Infrared Detector based Light On/OFF.
  • Automatic Light  ON/OFF.
  • Many other motion Detection Application.


Different PIR Modules

The HC-SR501 PIR Sensor Module

  • Working voltage : 5v to 20V DC
  • Range : 3 to 7 meters
  • Induction Lens size : 23mm.
  • PCB Size : 32mm x24mm.
  • Pins Details
    • Ground pin
    • VCC pin
    • Output pin (high logic level if an object is detected)
  • Two potentiometers.
    • One for adjusting the sensitivity of the sensor
    • Another for adjusting the time (0.3 Seconds up to 5 minutes) the output signal stays high when object is detected.
  • Jumper Settings (Selecting the trigger modes)
    • non-repeatable trigger – when the sensor output is high and the delay time is over, the output will automatically change from high to low level.
    • Repeatable trigger –  will keep the output high all the time until the detected object is present in sensor’s range

Arduino Example code :






Watch Video Tutorial (ArunEworld ‘s  Playlist Embedded Sensor -PIR)


Reference :

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