Timers
and Sensors for Home Security Light is one of the key elements to a safe home. Entryways must be lighted to welcome visitors and reassure homeowners who would answer the door. Walkways, grounds, exterior doorways, and garages need light for safety and security. Hallways, bathrooms, and stairs are all safer when lighted at night. Using sensors and timers helps owners respond to these needs for home security and safety. Sensors Motion detectors, or occupancy sensors, turn lamps on automatically when motion is detected in the room. They can be applied both inside and outside, and there are two primary types: infrared and ultrasonic. Infrared sensors respond to a change in infrared heat in a space, such as when a new body enters the room. Ultrasonic sensors engage when they detect a change in ultrasonic frequencies caused by motion in a space. It is only through movement that an ultrasonic sensor is triggered. Both types of sensors are mounted and wired like wall switches, and are available with a number of options like dimming, manual on/off, and three-way switching. They can even extend the service life of your lamps by extinguishing the lights when a room is unoccupied. For outside use, you should consider a combination motion detector and photosensor, which will make lights come on when motion is detected as well as when the surrounding light levels fall below a preset such as sundown. Because sensors respond to stimuli, they have many applications in home safety and security. Since sensors are programmed to detect and respond, they are frequently linked to alarm systems. Perhaps the most well known sensor-alarm combination is the smoke alarm. Here the smoke acts as a stimulus, triggering the sensor, which activates the alarm. The same principle directs sensors that detect intrusion, carbon monoxide, moisture, wind, power outages, high water, and even the sound signature of a tornado. Any or all of these can be programmed as part of a total home security package. In your car, sensors can even help you park without hitting the other car in the garage! Timers Plug-located timers are common, inexpensive security measures.
These units feature a clock that is set for on-off times, plugged directly
into the wall socket, and used as the plug-in device for lamps, stereos,
or televisions. They may also be used to power the family coffee maker
when not employed for security needs. Socket-located timers fit directly
into the medium-base socket of an incandescent lamp. This timer will activate
when the lamp is turned on and will automatically turn off after the designated
time has elapsed. These timers are very inexpensive and easy to install,
but make sure to follow the installation instructions if you do it yourself.
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Copyright Sudprasert Engineering (C)2002
10 February, 2003