Proximity Sensor Circuit

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Proximity Sensor

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation (infrared, for instance), and looks for changes in the field or return signal. The object being sensed is often referred to as the proximity sensor’s target.

Proximity sensors are used in a wide variety of applications, including:

  • Consumer electronics: Smartphones, tablets, laptops, TVs, and other consumer electronics often use proximity sensors to detect the presence of a user. For example, a smartphone’s proximity sensor will turn off the screen when the phone is held up to the user’s ear.
  • Industrial automation: Proximity sensors are used in industrial automation to detect the presence of parts, objects, and machinery. For example, a proximity sensor might be used to detect the presence of a metal part on an assembly line.
  • Automotive applications: Proximity sensors are used in automotive applications, such as parking sensors, blind spot monitoring systems, and adaptive cruise control.
  • Security and safety systems: Proximity sensors are used in security and safety systems to detect the presence of intruders or other hazards. For example, a home security system might use proximity sensors to detect unauthorized entry into a building.

Proximity sensors are a versatile and useful technology that is used in a wide variety of applications. They offer a number of advantages over other types of sensors, including non-contact operation, high accuracy, and fast response time.

BC547 Bipolar NPN transistor

This is a general-purpose NPN transistor. BC547 has a gain value of 110 to 800. The maximum amount of current that could flow through the Collector pin is 100mA. This transistor can be used as a switch. It operates in the saturation and cut-off region.

Application

  1. Relay Driver
  2. LED driver
  3.  Audio amplifiers
  4. Signal Amplifier
  5. Darlington pair

Component Required

  • BC547
  • LED
  • Variable Resistor – 200k
  • Resistor – 100 ohm
  • Resistor – 47k
  • IR Transmitter and Reciever
  • 3.7v to 5v power Supply

Circuit Diagram

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