Wireless Internet CCTV - Adding PIR Sensors

The new breed of CCTV cameras referred to as wireless internet CCTV cameras or IP cameras is totally digital, more such as a computer than the usual traditional camera. This new form of camera detects changes in the digital image that its sensor "sees" to determine whether something has moved within the picture. This approach of detecting movement may be increased with the addition of an inactive infra-red (PIR) sensor to the camera, as this information explains.

There's a limitation to using internet CCTV cameras to detect movement. These cameras determine whether movement has occurred of their field of view by examining changes in the digital images that the camera's optical sensor produces. One trouble with this method is that changes in the digital image may have been caused by something other than the usual person moving around. Like, if a street light Motion Detector Alarm System occurs outside a room where in fact the camera is located, there would have been a big change in the digital image because it will be suddenly brighter. The camera will notice this change and will raise a motion detection alert - a false alarm in this case. There are several approaches to resolve this dilemma, for instance by utilizing sophisticated image processing software in the camera or on a central computer so that individuals are "recognised" as people and an image-wide change in light level is ignored. An easier solution, however, is to employ a PIR sensor.

A top quality wireless internet CCTV camera will often have a tiny block of connectors referred to as an I/O or input/output port, which includes several purposes. The port is simply some holes where wires could be attached and tightened with a screw. The pair of connectors known as the input connectors are those used if you wish to connect a sensor such as a PIR sensor. The inputs are utilized since the sensor is sending a sign in to the camera, in place of the camera sending a signal outwards.

You'll need to decide on a PIR sensor which will assist the camera. The camera's ports will have the ability to accept incoming signals of a particular wattage and voltage, and attaching anything to the input ports that sends in electrical signals above the allowed range could damage the camera. Fortunately most PIR sensors have a reasonably standard output signal, and cameras are created to work with many them. Select a top quality sensor that can be adjusted for sensitivity and set to exclude the movement of small objects such as for instance pets. To create fitting easier, choose one with an integral battery. Although it is achievable in theory to power the sensor from the camera, in practice it's tricky to get enough power to the sensor and often better to choose the battery option. Next we will look at how a sensor is mounted on the camera.

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