Burglar Alarm Circuit
Burglar Alarm Circuit
making a simple burglar alarm for school project?
breaking circuit mechanism
Materials
Insulated Wire
Get 4 strands of wire, each 1 foot in length
You can find the wires around the house, inside battery-operated appliances that no longer work. Make sure that your parents give you permission to take them apart.
You can also buy the wires and other supplies listed from a Radio Shack, a hardware store, or the electrical section of big stores like Walmart.
Note: In order to make this alarm, you will need to peel off the rubber/plastic insulation from two of the wires. Try to peel the wires before starting this lesson. If it is too difficult for you, then you can buy non-insulated wire that does not need peeling.
1.5-volt battery.
Kite string or button-and-carpet thread, 3-5 feet long.
Scissors
Electrical tape
1.5-volt mini-buzzer
Spring-type wooden clothes pin
A scrap piece of board or plywood 4 inches by 12 inches or bigger.
Super Glue
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Principles
The best way I know to build something is to understand every individual part. The burglar alarm is made of three parts:
The device that makes noise – a buzzer
The battery
The buzzer switch
The Buzzer
We cannot have an alarm without something that makes sounds. That is why we use a buzzer, which is something that makes a loud sound. To make the sound, the buzzer needs to be connected to the battery.
The Battery
The battery is very important to The Alarm. For the buzzer to work, it needs energy. This energy comes from the battery. If the buzzer is not connected to the battery, it will not work. You have a switch to control this connection.
The Buzzer Switch
See how the buzzer works by connecting your 1.5-volt battery to the buzzer directly. (The buzzer should come with two different wires. If the wire is insulated, you will need to peel a small length so that you are able to see the metal wire inside.) Get two other pieces of wire and connect them to opposite ends of the battery. Connect one wire to (+) and the other to (-) (see diagram 1). In diagram 1, the battery should have the (+) and (-) labeled. Also, if you look closely, there is a (+) and (-) on the battery that you bought.
You may want to use electrical tape to hold the wires in place on the battery.
Connect the buzzer’s wires and the battery’s wires by twisting them, just like in the diagram 1. The buzzer should be making a sound; if it does not, check the connections at the ends of the wires to the battery.
Question:
What happens when you disconnect a wire from the buzzer?
Now, connect it again as often as you want and see how the buzzer turns on and off. By connecting and disconnecting the wires, what you have made is called a switch.
When you disconnect a wire and the buzzer stops sounding, we say that the switch is open. When it is open, no energy from the battery reaches the buzzer.
When you connect the wire and the buzzer sounds, we say that the switch is closed. When it is closed, the energy from the battery reaches the buzzer.
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Making the Alarm
Disconnect one battery wire from the buzzer.
To make things easier, put the battery and the buzzer on the wood, as shown in diagram 2.
Use a piece of electrical tape to tape the battery to the wood so that it does not move.
Get the buzzer and put it at the other corner of the wood and tape it to down, just as in diagram 2.
Now that you have taped the battery and the buzzer to the wood, we will work on the most important part of the burglar alarm, the switch. The burglar Alarm Switch is a little different from the buzzer switch that you made by disconnecting and connecting the wire at the beginning of this lesson.
Now you want a switch that works easily and more quickly, without you having to make and break the connection with your hands. You need a switch that turns on and off the buzzer depending on a door opening or closing. Making a switch that does this will result in a Burglar Alarm Switch.
The Burglar Alarm Switch
First, you will need to wrap the ends of the clothes pin with the non-insulated wire or the insulated wire that you have peeled. Look at diagram 3.
Make sure that the wires touch when the clothes pin closes, as in diagram 4. If the wires don’t touch, then there will be no connection and the alarm will not work.
After wrapping the wires, connect one of the free ends of the wire to one of the wires coming from the battery.
Connect the other wire from the pin to the buzzer.
Connect the remaining free wire from the battery to the buzzer (if you have not yet done so when making the buzzer switch, above).
Note: If you are confused by now, just look at diagram 5 and connect the wires as shown in the picture.
Test the switch by opening and closing the pin. When the clothes pin is closed, the alarm should sound. If it doesn’t, make sure all the wires are connected and that the clothes pin’s non-insulated wires on the end are touching. If it still does not work, look at diagram 5 and check all the wires again. It should work.
When it is working, you may want to turn it off by placing a small piece of cardboard in between the ends of the pin so as to open the switch and turn off the buzzer. It is annoying to continue working with the buzzer on. (See diagram 6.)
With the buzzer off, paste the clothes pin to a corner of the wood using crazy glue (see diagram 7).
CAUTION:
You have to be careful with the glue. It sticks very quickly. Do not touch the glue with your fingers. It might be a good idea to have some nail polish remover handy: if you accidentally get your fingers stuck together, it can dissolve the glue for you.
Finally, attach the string to the cardboard that you already put between the ends of the pin. When this string is pulled away, the wires in the pin will make contact and the alarm will sound.
You are done!
Now you have a burglar alarm. Just tie the string to a door tightly, so that when the door is opened, the cardboard is pulled out and the alarm sounds.
Have fun catching people who walk into your room or just someone who is stealing your lunch box
Why You Need To Install Burglar Alarm
Earlier, home Burglar Alarms were mainly found with prosperous homes. These days however, the price levels have lowered and they are becoming much more popular with residences of ordinary people. A great deal of folks who invest in burglar systems go for the do it yourself systems. They might be wired or wireless, setting off an burglar alarm whenever an intruder attempts to break in or whenever they are moving around inside your home.
With home burglar alarms, presently there are two types – open and closed circuit. Open circuit models operate by setting off an alarm when the circuit closes. When a window or a door is opened, the circuit is immediately completed and the alarm goes off. Closed circuit systems work the other way. When a window or door is opened, the circuit is broken – also setting off the alarm.
A further, more sophisticated option, are motion sensors. Motion sensors sense any type of movement inside a certain radius to the sensor. The moment it has sensed just about any action, it sends a signal out to the control panel that will examine it and see if the motion is regarded as dubious. If the motion is in fact viewed as suspicious, it will kick in to the way you have it set up and notify the proper bodies or sound the alarm.
Action devices can easily also be adjusted as well. You can alter them for factors like as pets walking around or any other action which is common with your house that would not represent a burglary taking place. Motion sensor alarms are very common these days, and one of the best ways to keep your house risk-free from a burglar – and provide you peacefulness in understanding that you are protected.
Typically, this is a great idea to use motion sensors and magnetic switches with your burglar alarm setup. Magnetic switches will protect doors and windows while the motion sensors will certainly support to safeguard larger homes, such as living rooms and hallways. The combination of the two is never a bad idea – and may go a long way in guarding your home.
One more available option that you have is a security camera. Video cameras are also common these days, and could be mounted in incredibly ideal places throughout the parameter of your home. They will locate pictures in the region they are fitted, that will be displayed on the monitor. You can also record the video to a videotape as well, making it an ideal choice for anybody who would like to retain track of the information that the camera picks up.
You may additionally find a burglar system from a home security company as well. The majority of companies monitor their systems remotely, and constantly have a person in the office to look after the system. Once the alarm is set off, the organization will instantly notify the nearby law enforcement or send their own security staff out to your home. This way, night or day, no matter where you go, your home will usually be protected.
Investing in a burglary system of any kind is always a great choice. You have several different models to select from, based on your needs. If you’ve been stressed regarding your house and the things you keep inside your house, you must spend in a burglary system. They will support you keep peace of mind, and understand that you are protected. They don’t cost that much either, which makes them an even better expense. If you own a home – you should not wait to spend in a burglary system.
About the Author
The article is contributed by a professional content writer, having experiences of working in different industries. For further information on best home security systems please visit http://bardhaman.com/best-home-security-systems/
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