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Introduction:
door opening alarm.
a door opening alarm circuit is an indicator, or a security alert device, which activates while opening the door.
alarm remains on, as long as the door is kept open.
for sensing the door position, different types of methods can be used, such as, magnetic, light beam, mechanical, electrical, etc.
most commonly used method is by using a reed switch, which is simply a magnetic door alarm circuit.
so, in this video, we will learn, how to make a door opening alarm, with the help of read switch , magnet, transistor, and buzzer.
these are the components, which are needed in this project.
one, n p n, transistor, b c 5 4 7.
1 kilo ohm resistor.
one 10 kilo ohm resistor.
one red l e d.
read switch, and magnet.
one buzzer.
9 volt battery.
p p 3 battery connector.
on off, rocker switch.
1 zero p c b.
4 screw with nuts.
and 4 plastic spacers.
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