Overview of PIR Sensors and its Working Principle

 sensors functions. Pyroelectric components used in these sensors absorb thermal energy and produce an equivalent amount of electrical power.

• The capacity of some materials to produce a momentary voltage when they are heated or cooled is known as pyroelectricity.
• The crystalline substance used to make pyroelectric sensors produces a surface electric charge when heated by infrared radiation.

Each of the two slots in the sensor is made of a unique substance that is IR-sensitive. Both slots pick up the same amount of IR while the sensor is not in use. A warm body, such as a person or animal, will cause a difference in the amount of IR in the slots.

PIR Sensor Interface with Arduino

Automatic room light with PIR SENSOR

Automatic Room Lights System using Arduino uses a motion sensor to sense motion and turn on the lights automatically. In this way, we can conserve energy and also have automation which makes our life simple.

Program for automatic room light:

int ledPin = 13; int pirsensor = 9; int val = 0;
void setup()
{
pinMode(ledPin, OUTPUT); pinMode(pirsensor, INPUT);
}
void loop()
{
val = digitalRead(pirsensor); digitalWrite(ledPin, val);
 
if (val ==1)
{
digitalWrite(ledPin, HIGH);
}

Applications:

PIR sensors are most commonly used in motion-based detection, such as in-home security systems, smart light systems, etc.

Advantages of Infrared Sensor

• Low power requirement

• High noise immunity

• Not affected by environmental factors like rust, corrosion, etc.

• Compact in size and are reliable

• Can be applied to a large area for a real-time sensing

Disadvantages of Infrared Sensor

• High-force infrared waves can damage the eyes.

• It can only operate one device at a time in the screen and control application.

• Be obstructed by everyday items.

• A small range.

• Can be affected by Environmental conditions such as rain, fog, dust, and pollution.

• Transmission Data rate is slow compared to wired devices

Takeaway

With this information, we hope you got a clear picture of how modern devices are doing many astonishing things easily. Motion sensor technology is even used in the Qatar World Cup’s official match ball – Al Rihla as well for accurate VAR decisions and offside calls. No doubt that the PIR sensors will surely keep improving in the coming years and they will be used for many more great applications.

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Check out the Robotics and Coding courses for kids offered by Guruface Academy to make kids learn about these technologies as early as possible. This extra knowledge will boost their career choices and overall tech knowledge. You can also signup for our weekly live webinar on Robotics for Kids topic to get an understanding of how these online sessions are conducted. Register now to book your seats before they are full.