Neighbourhood Watch              

... the ideal Site Supervision
    in context of Neighborhood Watch

The Idea:

Over and over you can read about housebreaking particularly during holiday season.
You've got a notion that even clearly arranged residential developments just as terrace
houses, semi-detached houses or flats are not excluded from burglary.

Is is the rule that trustfulness neighbors  are going to water our plants and check if everything's
all right during our holiday absence. In some cases even the entire neighborhood is informed
about an upcoming holiday and everybody observes the property of the others.

Nevertheless, even though the mail and newspaper delivery is unsubscribed, the physical
presence is simulated via time-controlled lights etc, intrusion and vandalism happens with
significant losses.

Thieves seem to have plenty information sources and invitations for burglary. Sole by knowingly and
inevitable published information as: Our practice is closed from..., Our silver wedding..., Communion,
Confirmation..., etc. takes place at.....

The mobile NWS offers more safeness for the Site Supervision!

Application:

The buildings that have to be observed are equipped with one or more radio motion detectors. Those will
detect and report any trespass to the alert receiver, located in the neighboring house.

In the event of motion detection, special Police-advised actions have to be taken.
 

Functional description:

The NWS is a mobile, radio controlled Alarm system. It can be set up and be ready for service without
any installation hassle by any layperson within minutes.
Using coded Alarm Transmitters, a single Receiver Station is able to control several observation objects.
 

Advantages of  NWS:

• An electronic 24/7 Object surveillance

• Protection of the "plant-watering" neighbor to avoid an on-site inspection (in case of an alarm)

• Reasonable alternative compared a fix installed alert system

• Inexpensive Rental System

• No further or running costs

• No installation required (Plug & Play)

• Easiest operation for everyone

The Concept of Neighborhood Watch Systems

System overview

The NWS is an Alarm System for home observation within the scope of Neighborhood Watch.

NWS is a mobile system and requires no installation at all. It consists of a set of Motion Detectors
(Transmitters) and a Receiver unit. The data transfer happens via radio frequency. The object to be
observed is equipped with one or several (up to eight) Motion Sensors. Any trespass results in an
alert on the Receiver unit. The Motion Sensors are equipped with a rechargeable battery, enabling
an uninterrupted operation of more than 50 days. The Infrared Sensor recognizes any motion within
a range of 5 meters anr reports the movement towards the Receiver unit, which is located in the
neighboring house (max. distance 50 meters). The Receiver generates an unmistakable Alarm
sound. The room, triggering the alert can be identified.  Failures on Motion Detectors or weak
batteries are reported to the Receiver Unit as well.

Ø Every Transmitter reports continuously every 5 seconds an "Alive-Signal". Live signals of detected Transmitters are indicated via a short light pulse of the corresponding LED on the Receiver unit. If two transmitters are located in the same room, a double pulse is generated.

         Fig. :  Indication of Transmitter Modes                          Fig. : Indication of remaining time till re-activation of                   
                                                                                                   acoustic alarms

Transmitter

The figure shows a Motion Sensor (Transmitter) with the adjustment of the accessible controls,
the indicator and the Infrared-Sensor.

Fig. : Transmitter Controls, Indicator and Sensor                                           Fig. : Side view 
                                                                                                                          Transmitter

 Positioning of Transmitter Modules

The Infrared-Sensor of the Transmitter module covers an area of +/- 50 Degrees in horizontal direction
with a distance of up to 5 meters (see yellow area). Vertically an area of +/- 43 degrees is covered.

Fig.:  Coverage characteristics of Infrared sensor (horizontal coverage)

Fig.:     Example Positioning of Transmitter Module in the Room to be observed.
            Coverage of Room height (vertical coverage)

Fig.:     Example Positioning Transmitter Module in Room to be observed.
            Coverage of Room Area

Receiver

The Neighborhood Watch System Receiver receives all Motion alerts of the Transmitter modules. Furthermore it monitors the Transmitter modules concerning their "Alive-Messages" and their current battery voltage. Motion- and Monitoring-alerts are reported optically and acoustically.

Fig.:     Receiver Module with Controls and

            Power Supply (front side up)

Status-Indication

The current operation status of the Receiver and the observation status of the monitored objects is indicated via 6 integrated LED's.
An acoustic transducer signals alert situations and critical conditions.

Fig.:  Receiver Controls and Status Indication

Technical Details

 Max. number of rooms to be observed      4
 Max. number of Transmitters / Room        2

Number of Receiver Units                          1

Operating Distance Transmitter-Receiver

Open air                                         > 100 Meter
Mixed environment                          approx. 50 Meters
Operating Distance Extension          optional via Repeaterup to 600 Meters

Battery monitoring                                     at every Alive-Signal, at least every 5 Seconds
Transmitter monitoring                               Alive-Signal every 5 Seconds
                                                               Alert after 10 Seconds

Technical data Transmitter

Battery lifetime (charging interval)     > 50 Days
Alive Interval                                    every 5 Seconds
Length                                            72 mm
Width                                             50 mm
Height                                            22 mm
Height                                            40 mm
Weight                                           approx. 100 g
Protection category                         IP 40

Technical data Receiver

Length                                            70 mm
Width                                             50 mm
Height                                            22 mm
Weight                                           approx. 150 g
Protection category                         IP 40

Frequency band                                        433 Mhz
Supported frequency domains                     8

Transmitter assembly                                Free range

Temperature range                                    0°C – 60°C