Much of the technology we’ve mentioned so far are great additions on their own but are even more effective when used together. Take motion sensors for example. These clever pieces of technology make for excellent burglary deterrents and prospective burglars will be put off by the presence of them on your home or business premises. In this post, we’ll look at why you should use motion sensors, what types are available and how they work in the dark to provide 24/7 protection.


Why use motion sensors?

They can detect movement in an area of your home or business where there shouldn’t be. They can then trigger a floodlight, an alarm system, automatically contact the police, or simply send you a notification.

What types are available and how do they work?

Motion sensors are designed to detect motion or movement within a designated area. They are a popular alternative to CCTV systems, but both can be used in conjunction with one another.

Although the most common form of motion sensors are passive infrared (PIR) motion detectors, some use active infrared (AIR) technology, while others use microwaves or ultrasonic radiation.

As described in our ‘how far can a security camera see at night’ post, PIR sensors detect the temperature of a body within the area.

AIR sensors on the other hand emit an electrical signal that connects to a light detector. Once the beam is interrupted by an intruder, the motion sensor will sound the alarm.

Microwave sensors emit a continuous wave of radiation to measure the reflection of a moving object. If the continuous wave of radiation is disturbed, the alarm is triggered.

Finally, ultrasonic sensors emit ultrasonic waves that are reflected back when an object appears in its proximity. Once the sensors note a change in the reflections, the alarm is triggered.

Depending on your security requirements, you can also opt for a dual technology motion sensor. These combine some of the above features. For example, you could have a dual technology motion sensor that includes both a PIR sensor and a microwave sensor.

Do motion sensors work in total darkness?

Absolutely! Motion sensors don’t require any imagery to detect motion.


Most home and business security solutions now include PIR motion sensors, but any of the above types will be beneficial for your home or business, as they can work during the day and in complete darkness.

For further information or to book a consultation, you can contact us directly at or via our contact form. As South-East Queensland’s leading home automation and security company, we are happy to help with any questions you may have. Servicing Brisbane, Ipswich, Gold Coast, Sunshine Coast, and the Redlands, we are dedicated to helping all of our customers find the perfect fit for their home automation, security, and most importantly, peace of mind.

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