The document discusses the mechanism and applications of Passive Infrared (PIR) sensors, which detect infrared light from movement, primarily human bodies. It details the working voltage, range, and how these sensors can be integrated into various systems such as security alarms and smart home technologies. Additionally, it highlights the importance of PIR sensors and their adaptability to new applications in different domains.

1. Mechanism of PIR
Sensor

2. Name ID
1.Wahid Bin Walid Badhan 19-40845-2
2.MD. Rokon Islam Emon 19-43417-2
3.Sanzidul Islam 19-40849-2
4.MD. Bakhtiar Azim Niloy 19-41011-2
5.Shobhan Kumar Saha 19-40911-2

3. Contents:
1.Introduction
2.Mechanism
3.Application
4.Uses
5.Conclution

4. What is Sensor?
a device, module, machine, or subsystem
Purpose
 to detect events or changes in its environment
 send the information to other electronics
 Types of Sensor :
1. PIR Sensor(Passive Infra-red sensor).
2. IR Sensor (Infrared Sensor)
3. Pressure Sensor.
4. Light Sensor.
Infrared
Sensor
Pressure
Sensor

5. Passive Infrared Sensor (PIR) Sensor:
measures infrared (IR) light radiating from
objects in its field of view.

6. Work of the PIR Sensor:
 Working Voltage: 5v-12v DC
 Ranging Distance: 3m-7m (Adjustable)

7. Mechanism of PIR sensor
 Consists pyroelectric
sensor

8. Mechanism of PIR sensor
 Detect movement
 Frenzei lens focuses the infared signals onto the pyelectric sensor.

9. Mechanism of PIR sensor
 let’s connect to the module to the Auduino mode.
o 3pins ground
o a VCC for powering
o a output pin
o two potentiometers
 This time can be adjusted from 0.3 seconds up
to 5 minutes.

10. How PIR sensor works for Human Body
 Human body
clothing received
the pyroelectric
sensor
 In this surveillance mode the
pyroelectric sensor sees the
moving human body
 IR constantly
changes the
temperature of the
pyroelectric
material
IR outputs a
corresponding signal,
which is the alarm
signal

11. • PIR sensor based Security Alarm Based System
Switch on the circuit initially
The PIR sensor is powered and detects the IR rays emitted form
any human.
The sensor range of 5meters adjust the pot provided to vary this
distance.
when a presence is detected, the PIR sensor outoutas a logis
valueof 3.5V-5V
this voltage is applied as input to the siren generator IC

12. PIR sensor other uses:
 smart home
 elevator
 all outdoor Lights
 common staircases
 for Basement or Covered Parking Area
 shopping Malls
 for garden lights
 many more…..

13. Application of PIR sensor in Smart Home

14. The Application Of PIR Sensor In Smart
Home
 Smart Lighting:
 Thermostat:


15. The Application Of PIR Sensor In Smart
Home
 Sensory Switch:
 Environmental Monitoring:

16.  Conclusion :
 Importance
 Advanges

17. Precautions
 the use of voltage surge absorption elements is highly
recommenend.
Overvoltege

18.  Adapting PIR Sensor technology
to New Applications
 Motion sensing for Robot hands
 Car parking
 Market opportunities