What are the differences between various motion sensors?

What are the differences between various motion sensors?

There are several types of motion sensors, including passive infrared (PIR), ultrasonic, and microwave sensors. Each has its own strengths and weaknesses.

Can you explain how passive infrared sensors work?

Sure! PIR sensors detect motion by measuring changes in infrared radiation, typically from warm bodies like humans or animals.

What about ultrasonic sensors? How do they differ?

Ultrasonic sensors emit sound waves and measure the time it takes for the waves to bounce back. They can detect motion even in complete darkness.

Which type of sensor is best for outdoor use?

For outdoor use, PIR sensors are often preferred due to their ability to ignore background noise and their lower false alarm rates.

Are there any sensors that combine different technologies?

Yes, some sensors combine PIR and microwave technologies to enhance detection accuracy and reduce false alarms.