Category Archives: Home Security Systems

How Do Wireless Motion Detectors Work

How Do Wireless Motion Detectors Work

Motion sensors, as their name suggests, detect motion over a limited distance through infrared heat sensors. They can transmit their response to motion, through radio frequency transmitters. These devices are mainly used as home security devices.


Wireless motion sensors are designed to detect rapid motion in a specific area around them. They spot movement through detection of rapid changes in infrared radiation, incident on them.

There are certain crystalline materials that show pyroelectric effect. That is, when heat in the form of infrared radiation is incident on them, they generate a current on their surface. These crystals are very sensitive to small changes in infrared radiation and therefore, the current they generate, changes accordingly. Such crystalline material wafers are used as thermal sensors. Every object, which has a quantity of heat, radiates infrared radiation. The human body emits infrared radiation, which is around a wavelength of 9.4 micrometers. Motion of a human body, therefore, creates changes in the local infrared radiation pattern, in the vicinity of the sensor.

The incident infrared radiation is focused on the sensor by a ‘Fresnel lens’, which is made up of a material that is transparent to radiation, between 8-15 micrometer range. This frequency range is used specifically so that human movements are detectable. The Fresnel lens is a plano-convex lens, with the convex part diminished or made thinner. The convex part faces the sensor crystal and focuses infrared radiation from a limited angular range on the crystal. Movement within an angular range of 80°, in front of these sensors, can be detected this way.

To summarize, they have a pyroelectric crystal that acts as a sensor, fitted with a Fresnel lens. The change in heat around the sensor generates electrical signals, which are passed through an appropriate electrical circuit, that measures the pulse width and the rapidity of change.

It is important that environmental heat changes and temperature changes due to sunlight, do not trigger the response of the sensor. So, to avoid the triggering by these factors, sensors which monitor ambient temperature and heat changes are installed.

The thing that differentiates a human body movement, from an environmental heat change, is the rapidity of change in radiation pattern. So, the electrical feedback system of the motion sensor is designed such that, only rapid changes in motion, that create rapid changes in electrical signal output, are detected.

Once it detects motion this way, there are transmitters inside the device, which relay radio signals and switch on lights instantly, or create any other kind of programmed response like activating an alarm.

How to Set Up A Wireless Motion Sensor Security System?

The sensor comes as a single unit, which can be coupled with your light devices outside the house, by using a radio frequency base receiver. The base receiver can be connected to many light devices, which can be instantly switched on, as a response to motion detection. You can set up the motion detector in the porch or around the house, where you suspect intrusion.

If any motion is detected during the night, it lights up the porch lights or triggers an alarm. It also has an inbuilt timer, which switches off the lights, if no motion is detected for a prefixed amount of time, after the first instance. The outside casing is made weather-resistant, as well as tamper-proof, with a specially designed screw.

The sensor, coupled with a video surveillance security system, can be an effective deterrent and prevent burglaries and trespassing on property. Such devices are essential for protection of vital assets.

It can also be used indoors, as an electricity saving mechanism, which switches off lights in the room automatically, if there is no movement for a specific period of time. So, it can help in bringing down unnecessary wastage of electricity and reduce your power bills.

With devices like these sensors around, one can rest easy about home security and enjoy a good

Vacation Safety Tips for Your Home

Vacation Safety Tips for Your Home

The commonest of mistakes that people make, when out of their homes, is to leave their house keys under doormats or in the potted plants which hang outside their door. Everyone, including the burglars and thieves “know” such locations and there are high chances of them finding your house keys, if you too do the same! House break-ins occur anywhere, anytime. Their incidences particularly increase during the holiday time, when families are out on a vacation. That’s why, if you are planning a vacation and nobody’s going to be there in your house for a long period of time, it is advised that you take certain precautions, to keep your house safe!

List of Home Safety Tips while on Vacation

# 1: When out on a vacation, be careful as to whom to tell and not tell about your plans. As far as possible, avoid discussing your plans with neighbors, colleagues and other acquaintances whom you do not know that well. Also, do not leave a voice mail message on the phone or keep such a status message on any website which tells others that you are out of town for long. You never know, how this information can be misused by others!

# 2: There are some clues which can give away that you are out on a vacation. For instance, if the newspapers keep on piling at your door or if the grass in your lawn is not mowed for long, someone can conclude that the home owners are away. So, make sure that you take care of all such things, before going out on a vacation. For stopping the delivery of newspapers, you will have to call up the newspaper circulation department. As for the grass, probably you can ask one of your close friends or immediate neighbors, whom you trust, to get it mowed regularly.

# 3: Lock the doors and windows of your house before you set out on a vacation. Cross check that you have properly closed the garage door and basement windows, as these are usually overlooked. After all, the last thing that you want to do is to give an open invitation to thieves, to enter your house!

# 4: Try to maintain such a look in your house which gives an illusion that somebody is staying in there. For instance, you can ask a friend or a neighbor whom you trust, to park their car, once in a while, in your garage. If you can request them to maintain your outside garden and yard, even better. Set timers on the lights and preferably, on a radio too. The lights will go on and off in various rooms, plus the radio will play sometimes. This will make any possible intruders think that someone is in the house.

# 5: One of the most useful tips is to inform your local police department about the time period you will be away from home. Sometimes, they might keep a check on your house and the neighborhood. This would prevent people who do not reside in the neighborhood, from entering.

# 6: Have your home security system in place. Inform the company that you will be gone and how to contact you, while you are on a vacation, if there is an emergency. Preferably, give a local contact person’s name and phone number, in case a mis-eventuality takes place.

# 7: Do not leave cash or jewelry in your home. Deposit it in a bank or keep it in a home safe, before you set out holidaying. Also, the electricity, water and gas supply should be cut off, so as to ensure electrical safety in the home. This will also ensure that there is no fire or flooding in the house, in your absence.

# 8: Leave your emergency contact number with a trusted friend or neighbor. This way, if any untoward incident takes place, you can be informed immediately.

Wireless Memory Card Home Security System

Wireless Memory Card Home Security System

Home security is a major cause of concern due to an alarming rise in the number of crimes like theft and murders taking place these days. Most systems fail to guard your house while you are away. These systems do not have any provision for recording the crime. However, the new wireless system not only protects your house in your absence, but also provides you the necessary evidence if something goes wrong.

This system consists of a sensor, a camera, and a base unit. Considering the benefits that this system provides, its cost is surprisingly low. You should consider installing this system in your home as it not only detects the break-ins, but also records the whole event. This helps the cops in investigating the crime and also present it as valid evidence in the court.

The sensor in this system is equipped with an alarm that sets off in case of a break-in, alerting the occupants of the house. It detects any unusual or suspicious movement and causes the alarm to go off. The sensor is sensitive enough to pick up movements like tripping over a garbage can or barging through a back door. This utility warns the occupants of a potential threat and gives them a chance to prepare themselves.

The system’s camera captures the unusual movements and records them. You can place the camera in all the threat-prone areas, such as the front porch, back door, and windows. Many people choose to hide the camera within flowerpots or place it in unexpected areas. You can pose it as a smoke alarm or a normal light bulb to avoid revealing the position.

The best position for placing the camera is on the ceiling, this allows it to cover a wide area and prevent it from getting damaged. Few people intelligently place a dummy camera in the most obvious places and the actual hidden camera captures all the events. This deters the invader from stealing a particular thing from that area.

Installing this security system is quite simple. Since it is wireless, you do not have to bother about placing and masking the wires. The system can be accessed from any device which has the required software installed in it.

Safety and Privacy
These home security systems are absolutely safe to use and are also very reliable. However, few people might think that these systems invade their privacy in some or the other way. To avoid possible arguments over the privacy issue in your family, always take your family members in confidence and make them aware of the places where you have hidden the camera. Never hide a camera in a bathroom or bedroom.

Motion Detector Lights Troubleshooting

Motion Detector Lights Troubleshooting

Today, motion detector lights are considered to be the source of security, or you can say, watchdogs, if you speak about the safety of your own house. They not only help you see through the darkness, but come on with an alarming bang in case of hunches. The best part is that they automatically switch on when they sense any sort of motion, burglary, human, or animal movement in the surrounding area of a residence. They stay on for a while and all the detector alarms go off automatically. Now, in this time of action, all the chaos that is aroused is good enough to instill fear in the burglar and scare him till the end. Since these lights are so handy and useful to a homeowner and his property, it is obvious to keep a check on its regularity and proper functions, whether they work well or not. If, however, they malfunction, you could try out some simple motion detector lights troubleshooting tips for fixing them.

Troubleshooting Tips

Clean the Lights

As most of them are outdoor motion sensor lights, cleaning happens to be the most valid point though. Clean all its light surfaces with a piece of cloth and a cleaning solution. There can be mildew, debris, dust, light attracted freaky insects stuck into the sensors, and so on. These typical outdoor conditions soil the sensors, dim the capacity of the bulbs to emit proper light, and ultimately give out on the fixture’s normal functionality.

Check the Light Manually

A detector could be blocked due to some good reason eventually providing no power to the light. If you see a blockage, remove the interference that is causing it. Remember, interior lights have detectors on the switches, and the ones that are on the exterior have detectors fixed directly on the light(s).

Dysfunctional Detector

Another possibility can be a bad, dysfunctional sensor. If you find out that the detector or the sensor is gone completely bad and the alarms aren’t functioning well, it’s time to change them. You can only learn about the state of a bad detector by using an electrical meter. This meter will help you know whether there is electricity running through the main power supply box or not. If the power is missing, perhaps the breaker is tripped and if the electric power is present, that means the detector has gone bad. Buy a new one from the hardware store to fix the problem.

Fussy Light Bulbs

One of the most common problems with these lights is that of erratic light bulbs, which burn out over time. They are the main reason motion detector sensor lights do not work half the time. So, if you learn that the light bulbs aren’t working, unscrew them and replace the old for new with the same wattage. After replacement, switch on the bulb and check for its working condition.

Aim and Adjust the Sensor

If the lights do function, but if they do not function at the right time, there is no point. For this reason, you will have to adjust the points of the sensor correctly. Choose the area where you want the light to respond to, then hold the detector at its back and tilt it slightly such that the light sensor directs in your chosen area. Next, set the distance of the light to monitor and slide the Sensory Adjustment Dial to medium, low, or high state, depending on how far you want its light to respond to. Once all this has been decided, slide the switch to next and test the detector for its working condition.

Set the Right Time

There is a choice of adjusting the time of your motion detector lights to remain on even after the object or movement has been detected in your surroundings. The time range is standard, i.e., 30 seconds to somewhere around 10 minutes long. If, in this given time, the lights do not go off, then it’s time to adjust the sensory adjustment dial located on the detector to feed in the right time for the light to stay on.

It is hard to deny that with increasing technology in today’s world, a man’s life is becoming much easier day in and out. And, one of the major contributors are these motion detector lights, which guards a homeowner and his property and gives him sound sleep at night. These tips should come in handy the next time you have a problem with your security system.