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> Door Alarm System
Summary: The first ever alarm system was a straightforward device consisting only of a power, a solenoid gong to serve as the alarm and the trigger
The first ever alarm system was a burglar alarm. This door alarm system was a straightforward device; the circuit consists only of a power, a solenoid gong to serve as the alarm, the switch or the trigger. In an era where inventions and discoveries are taking place one after the other, the alarm system was surprisingly received warmly, even though major inventions such as the telephone did also take place.
Though Edwin Holmes door alarm system is somewhat primitive compared with todays technology, it is still surprisingly effective. The design flaws of the door alarm system make it a bit unreliable but if you are interested, read on as I detail how to put together your own door alarm system.
Note that this little DIY (do-it-yourself) exercise needs elementary electricity skill. You should know also the dangers of naked lines and electrical hazards. So without further ado
Choose a switch. The suitable one is a press switch. To help you illustrate, study the door switch of a refrigerator. When you open the door, the light goes on, right. The circuit we are going to make is exactly the same, except our resistor wont be a light bulb but instead a buzzer. So choose a press switch that completes the circuit when the button is released. If your not sure, ask the help of the proprietor of the hardware store.
Now choose a buzzer. The buzzer is purely your choice. It could be a standard BUZZ or a subtle Ding-Dong as long as it is loud enough to be heard for it to be useful.
Now, choose another switch. This switch is used in setting the device on. Because without it, your door will constantly alarm whenever somebody passes through the door.
Connect the circuit. Start first by choosing a spot for the buzzer. The best place for you to place the buzzer would be in the stairs area or the junction of two rooms (if its a one story house). Attach the trigger switch to the doorframe, basically just like the refrigerator device. In most cases you have to extract a piece of the wood to have a place for your switch. Close the circuit by attaching to a power supply. Remember to turn off the power before working. Attach first the wire to the alarm, then to the trigger switch then to the control on-off switch then lastly to the buzzer. Attach the circuit to the power lastly. Check the connection, if you have a tester its time to use it now. Check everything thoroughly before putting the power back on.
When activated the door alarm system will buzz every time the door is open. Now you see the flaw. It only takes the intruder to close the door for the alarm to silence. But still, in most cases. The alarm should jolt everyone to wakefulness.
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> Wireless Alarm System
Having a wireless alarm system installed in your home is one of the best ways in implementing home security. Wireless alarm system has two ways of transmitting its connection. It is either connected by radio frequency or infrared light rays. Wireless home alarm systems can either be monitored or unmonitored. Monitored wireless alarm systems transmit signals to a monitoring station of the security company as the alarm is triggered. More often these alarms are not audible. In unmonitored wireless alarm systems, a very loud alarm (more often a siren with flashing lights) is set off but does not notify any monitoring station.
The heart of wireless security alarm systems is the control panel, which is usually located on the basement or on a hidden panel. In wireless alarm systems, the doors and windows are installed with two magnetic switches. One magnetic switch is installed on the door frame or window frame and another is installed on the door or window so that if the switch is moved out of its position, an alarm is triggered.
On hallways and large rooms, motion sensors are installed. However some wireless security alarm systems use infrared sensors, motion detectors or temperature sensors. Infrared sensors and temperature sensors detect body heat, while motion detectors detect movements on the room or hallway. If any one of these sensors is triggered, a signal is then transmitted to the control panel which analyzes it to determine if the intrusion is unauthorized or not. Wireless security alarm systems use keypads to disarm or arm the system. These keypads are normally found near the main entrance.
Wireless security alarm systems have six advantages over wire security alarm systems. The first one is that wireless security systems are easy to install. You can install one yourself unlike the wired systems wherein proper installations of wires are needed. Second, you can install them anywhere since the usage of wire is not required. Third, wireless systems are flexible; unlike their wired counterparts, wherein you have to review the wiring plans before any altering of the system. Fourth, it has a cleaner look. In a wired system, you have wires running all over the house. Fifth, wireless security alarm systems are more difficult to tamper. Wired security systems can easily become un-operational if the wires are severed intentionally or not. Lastly, wireless security alarm systems are easy to maintain. Wire security systems are bulky, hence, requires more maintenance while in a wireless security system, the only thing you need to maintain is its power supply that usually are the batteries.
Always remember to check your batteries in order for your wireless security systems to be reliable.
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