» Video »Home burglar alarm from smoke detector

Home burglar alarm from smoke detector




Everyone wants his home to be well protected from thieves and burglars. Installing an alarm system through a company and paying all the time for it is quite expensive. Therefore, we suggest you make an alarm do it yourself from a conventional signaling device.

In this video, see how you can do home burglar alarm



To create an alarm we need:
- smoke detector SPD 3-4
- screwdriver;
- reed switch;
- soldering iron.
- conductors.

The smoke detector is designed to detect a fire, i.e. triggered by smoke. the sensor is mounted on the ceiling or on the wall. When smoke enters, it generates an audio and light signal.





We disassemble the signaling device. Unscrew all the nuts and cogs. Inside, there is a board, a light indicator and a plastic case attached to the board. From the board there are wires to which the battery is connected. There is also a button on the board.





When smoke enters a narrow gap in the casing, the lamp first fires and only then an audible signal sounds. After a while, he turns off himself.

Remove the housing cover. Underneath is the emitter and receiver. Smoke enters, the beam of light weakens and the system fires.

How to use it. For example, hang over the front door. If you connect a reed switch or microswitch to the contacts of the button through the conductors, when the door is opened, the contact will be closed and the system will work. Get a home alarm. Such a siren can scare someone who illegally tries to enter your home.





Reed switch is a transparent cone with metal plates that close if you bring a magnet to them. If you put a reed switch in the door frame and mount a magnet in the door, then when the door is closed, the alarm will turn on. It is not right. For the reed switch to work on opening, you need to pick up two magnets.





With a microswitch, the alarm will work much easier. It turns out when the door is closed, the alarm is in standby mode. We open the door, the button is wrung out, the alarm is triggered.
1
4
2

Add a comment

    • smilesmilesxaxaokdontknowyahoonea
      bossscratchfoolyesyes-yesaggressivesecret
      sorrydancedance2dance3pardonhelpdrinks
      stopfriendsgoodgoodgoodwhistleswoontongue
      smokeclappingcraydeclarederisivedon-t_mentiondownload
      heatirefullaugh1mdameetingmoskingnegative
      not_ipopcornpunishreadscarescaressearch
      tauntthank_youthisto_clueumnikacuteagree
      badbeeeblack_eyeblum3blushboastboredom
      censoredpleasantrysecret2threatenvictoryyusun_bespectacled
      shokrespektlolprevedwelcomekrutoyya_za
      ya_dobryihelperne_huliganne_othodifludbanclose
3 commentary
Sometimes it is very useful, you can make it turn on the light, for example, or some kind of actuator. An important idea is that the controlled object can be removed from the signal one.
Great idea! And then it’s boring to read somehow: "We are buying a Chinese Kit-kit ...". And where is the work of thought, where is creativity? Well done author! By the way, I came across three-pin switching reed switches.
Why such a signaling device? Signal that the door is open?

We advise you to read:

Hand it for the smartphone ...