When an intruder enters the room, the PIR sensor measures the heat radiation from that person and converts these measurements to a digital signal, which is then communicated through the wireless network to the main alarm unit. The PIR is physically mounted in a room and communicates, typically via WiFi, with the main alarm system elsewhere in the house.
Most of these devices already communicate wirelessly, so what I'm suggesting is a rather small adjustment that might just change the way we think about security.Ĭonsider a classic PIR based surveillance system, where the PIR unit is divided into two parts: An infrared sensor and a wireless communication part. In some cases, this could avoid the cost of physically mounting traditional burglar alarm systems, such as the widely used Passive InfraRed (PIR) sensors, ultra-sound sensors, door contacts, motion detectors, or glass break detectors. These applications could lead to a new generation of security or monitoring systems for detecting physical intrusion by humans in your home or workplace, using only the radio frequency (RF) signals of your wireless network.
It's a high tech surveillance system that not even The Night Fox of Ocean's Twelve could capoeira his way out of without triggering the alarm. WiFi is routinely used for such applications, connecting people and allowing information to be transferred from one person to another (file sharing), between a person and a computer (streaming and Internet use), or between two or more machines (cooperating robots).īut very different applications are under development at the Technical University of Denmark (DTU) and the IT University of Copenhagen (ITU) in Denmark, (here and here), which use WiFi Internet for very different purposes: To identify and track the movement of people within a building covered by a wireless network.
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