Using PIR Sensors - Notifications & PTZ Presets

The benefits of using External Detection.

We have spoken previously about Alarm Notifications from your Hikvision CCTV system, and end-users are finding these real-time alerts a nice feature. The only downside to these motion based notifications is how they work. A camera will look at pixel changes in the area that has been selected, but the camera itself cannot decipher between a shadow being cast on the image, light shining across it or a person walking through the picture. Enhanced analytics and future developments which allow for 'human form' detection will help to filter out some of these false alarms. Even futher than that there are a number of additional devices which can work alongside your CCTV cameras to help provide more accurate alerts.

Hikvision have now started introducing PIR sensors into some cameras (Such as the DS-2CE71H0T-PIRL-2.8MM - Now in stock) which works with the false alarm filtering within the DVR motion settings. The false alarm filter essential means that motion will only class as being detected if there is a pixel change paired with the PIR detecting a warm body in the frame. This can be a neat and tidy solution for your TurboHD customers where notifications are an important feature, a single power source will power the camera and the PIR and is easily mounted as a single unit, however there are limitations in PIR distance and the PIR will only work in the same direction as the camera is facing. The camera's PIR can also be used to trigger an internal LED which can be set to strobe (flash) or constant and may be enough to add an extra deterrent to your customers property (the other advantage to this is that it could get the attention of an intruder and force them to look straigt at this new light source meaning you get an image of their face).

The most popular choice of detection would be a PIR (Passive Infra Red) Detector, and we supply PIR sensors from GJD and Luminite.

The basics: A PIR sensor works by having a special material which is sensitive to infra red light. With no activity in the area the IR reading across this material should be the same (or at least very similar) throughout the IR sensitive material. When a blocking material with two slots is placed in front of this material, the reading at the two slots should be the same. When a warm body enters the detection zone one of the slots will measure a positive differential change. These pulse changes are what triggers the detector.
Lenses within various detectors can be used to alter the IR reading distance and width.

These sensors are tailored for filtering false alarms and there is a wealth of options for range of detection, angle of detection, wired/wireless detectors and now IP detectors.

For this guide we will be taking a look at the GJD Elite and show how it can be used alongside your CCTV to provide accurate notifications.
The GJD Elite is an affordable option with a wide angle and multiple modes of operation, two volt-free relays and programmable parameters (duration of timed changeover, pluse count and choice of detection ranges from 10m to 35m). Power input from 9V to 15V means that it works well with most standard CCTV power supplies. These can be mounted at any height but optimal height is 3m.

Products use in this demonstration blog are as follows:

Hikvision DS-2CD2143G0-IS Anti Vandal IP dome camera with Alarm inputs/outputs
GJD 023 Elite PIR Detector
Smedz 802.3af/at POE Splitter 12VDC, 10/100Mbps
2-way DC splitter
Smedz POE Injector 802.3af/at

Making Connections:
For this demo we're using a POE injector but if the camera was connected to a POE port of an NVR then the injector would be surplus to requirements.
1. A Cat5e cable is run from our network to the LAN port of the POE injector.
2. A Cat5e cable from the POE output of the is connected to the POE Splitter.
3. The RJ45 connection of the POE Splitter is connected to the Camera's RJ45 input.
4. The 2-way DC splitter is connected to the DC output from the POE Splitter.
5. Power from the 2-way splitter is then connected to the camera and to the PIR detector.
6. The PIR detector's alarm outputs are connected to the Camera's alarm inputs.

    

Configuration.
The GJD Elite detector has quite a lot of configuration that can be done in itself, but we'll use it in its default state and use the Alarm 2 output.
From the recorder that the Camera is connected to we will use the web browser to configure the settings.
Web browse to the NVR's IP address . ie. 192.168.1.100


Go to configuration, Event, Alarm Input.
From the dropdown list select the IP address of the camera followed by the alarm input number (in our case we only have one alarm input). The alarm input in this case is 192.168.1.6<1


From the linkage actions you can choose what happens when the alarm is triggered. Audible warning, Send Email, Notify Surveillance centre and Full screen monitoring. You can also trigger and Alarm output from the recorder (a Siren or strobe for example) and you can choose which channel number is triggered for recording (and event image). If you have a PTZ connected then the alarm input can also trigger a PTZ Preset, Patrol or Pattern

For this demo I will choose 'Notify Surveillance Centre' so that I will receive a notification through the Hik-connect app.

With everything connected and configured when the GJD PIR detects any movement then it send a notification to my hik-connect mobile app.

Please Note: Hik-connect reports the alarm input notification as an IO Alarm but doesn't yet take the alarm name that has been set within the DVR/NVR.

This blog has covered using a GJD detector connected to an IP camera and making use of the POE splitter to power it allowing the use of a single Cat5 cable to the cameras location. Of course the detector can be used independently of the IP camera for use with a Turbo HD system but in this case the detector would require a cable to power the detector and a cable to run back to the Alarm inputs of the recorder.

Using a Detector to trigger PTZ Actions.

As a further demonstration we will show how a GJD can be used to trigger a PTZ preset. An example of use for this kind of feature would be where a PTZ has been set-up to sit in a Park Preset position to watch over an entrance way, this would mean that the PTZ has a blind spot behind the PTZ's facing position and the extra detection can be used to cover this blind spot, and trigger the PTZ to turn 180 degrees to see what has triggered the detector. The set-up within the recorder or Camera is very similar to the above, only this time instead of choosing 'Notify surveillance Centre' as the linkage action we are selecting PTZ Linking and choosing Preset 2 for this PTZ camera. *Important factors to consider for this kind of set-up is how many Alarm inputs the PTZ has (although you could also wire the detector back to the recorder if required/possible) and how you will provide power to the GJD detector.

Please watch the video below for a visual representation of how this works.

The video is only a very basic demo of how the products can work together, but by using the detectors in such a way means that the PTZ can be used much more effectively to cover multilple areas.