15 minutes SMS door entry alarm

Step 2 Let's get to work

here is the whole thing....you write the text message " for example : the main door was opened " then you put your mobile number then you...don't press the sending button.... you'll make the burglar do it !
you just want the magnetic switch to work as the sending button.

but unfortunately most of the alarms on the market contains an NO "normally-open" magnetic switch
so when the magnetic field applies "that means the door is closed ", the switch closes. and that means also that when the door is opened the magnetic field vanishes and the switch is opened..
we need the opposite of that we need the switch is closed when the door is opened and vise versa

what will we do ?? you can just seek a SPDT "Single Pole Double Throw" magnetic switch from components shops this should solve the problem of the whole alarm, but this was hard to find so i used a relay powered by the mobile charger to do the job..

The other problem is that some mobile sets closes the keypad automatically or switch to standby mode after a period of time "in order to save energy" but most of old ones doesn't... you just have to go to settings and turn of the automatic keypad lock.

if your mobile does closes the keypad automatically or switches to stand buy mode then you'll have to build a small 555 timer circuit that will trigger any unvital key on the keypad like the volume control " every 3 sec for example " to keep it on the send message mode.. of course the mobile should be powered from the charger all the time.

Comments

[miffy1297]

Hi Am I missing something , Once the switch is made , does this not mean that the send button is effectively on all the time. I am thinking of using the system on my old boat , to warn of water ingress , but the switch would make once only , whereas you really want a pulse to operate the phone.
any ideas.
Miffy

[PanadoL]

Hi,
No once the message is sent "in most mobiles " it wont be sent again
you have to "re-trigger" the switch to send the SMS again,
for your application you can also make a very simple digital circuit to send one pulse and stops working,on this way you wont need to "re-trigger" the system to make it work again.
cheers

[miffy1297]

Hi
Many thanks will rig up a circuit and try this.

[waddellm]

Hi Miffy,

I am wondering if you ever got this to work for your old boat. I arrived at the same instructable because I am trying to do the exact same thing to warn me if the bilge pump is running, or if the water level gets too high on my vintage boat.

Any help you can offer would be great!

thanks,

[miffy1297]

Hi waddellm

Yes I have had this system working on my boat for the last two years. The only problem I had was keeping the phone battery charged . as I can leave the boat for several months over the winter, All I did was connect the bilge switch do the phone contacts , unfortunatly it was never tested as I have not had a leak.
Best wishes Andy

[hunterbait93]

 instead of doing the weird stuff with the magnetic switch, just set it on the door frame and put a magnet into the door so it passes, duh

[jules15]

i tried that last year and the relay is much easier

[wjames]

is this the logic diagram?

[sting_hbh]

egypt #1

[PanadoL]

Don't overreact Egypt isn't # 1 at any thing but we r the last at many things :( :(

[ochoa10]

(if I write something wrong excuse me; I´m Latin) macobt make me have an idea: You can even add a switch to every pin number of speed dial from 1 to 9 to monitor every door or windows of your house! Regards to all.

[PanadoL]

yeah but you'll have to walk with 9 phones then : ) )

[ochoa10]

Hi, Panadol! I don't know why?, I can't assign the pin number 1 of the speed redial; But from 2 to 9, I did it! to the same telephone number; I can imagine that i can assign different SMS to the same telephone number!

[PanadoL]

Some mobile phones let the # 1 key for the voice mailbox , but I don't understand how you'll assign the SMS with the speed dial keys , is your mobile phone has this feature ?? but away from soldering all the buttons you can just place the magnetic switches on every door and window and wire them all in parallel to one of the mobile keys but you wont be able to know which door or window is opened of course Regards.

[dirtbiketrailsrider]

If you have multiple phones on each door and window and you have them call, you can set your phone (the receiver) to have a different ring tone for each window/door. Nice Instructable.

[PanadoL]

The Numbers should be enough , you'll just save the # to contacts as "the kitchen window was opened " for example , but that will require a lot of phones with services :- /

[macobt]

Good,instead mesage you can make a call to number from speed dial number on the keyboard,same schematic just conect the wires to pin numbers from 1 to 9,and when a door is open one of speed dials are presed and call too desire number,even you can answer too this call and listen what is hapening. regards macobt

[batman96]

All you have to do is call the phone as soon as you receive the "robber" txt msg. put the ringer on silent, and turn on auto answer. So you can listen in if you want to.

[macobt]

why to do that,when the alarm is turn in on when is conected one of speed numbers and auto conecting to disere number,and you can answer the call and listen,another suggestion is to conect speaker phone to alarm to be louder when you speak,too scare the intruder.

[PanadoL]

yea it's cooler idea... it won't even use credit or cost you anything. even if the door was closed and opened again this will release the key and trigger it again so you'll receive another call and the system won't need setting up again every time you come in and out this will also solve the problem of how you'll get out of the house without an SMS being sent every time... Thanks for your valuable suggestion Macobt I'll probably update the instructable and refer to your comments. Regards

[versanil]

You could connect a loudpeaker and talk to the robber. Suggest alternative sources of income XD

[PanadoL]

LOL ,You know what , that may frighten him and he'll run away then :D :D really nice idea :D

[macobt]

MY ALARM SYSTEM HERE IS PICTURE.

[jiyoonasan]

 sir please help me with my thesis.. i am willing to learn that thing its because it will be useful for our thesis authomated door access i hope u can help us.. sir, it case i am requesting for some video or screen shots on how to do that.. tnx a lot.. hoping for your reply..tnx.

[macobt]

first tell me whether you have knowledge of electronics???

[PanadoL]

wow... that's much neater than mine :) what's that IC ??

[macobt]

Here is link to schematic very simple>
http://english.cxem.net/guard/guard42.php
Regards Panadol

[fkuk]

just add a switch in the line and add that switch out side the door and one switch inside the room in a hidden location

[i make shooting things]

Perhaps a hidden magnetic relay thingy; just hold a magnet to a spot on the door with a magnetic switch hidden on other side. But thats pushing it, probably better to just keep things simple.

[macobt]

sometimes simple things are better,but when you build a alarm for your house then we need something more intelligent,like this cell call when someone want to get in the house and you are alerted by call of your alarm and when you answer to call you may listen what is hapening.regards to all.