Picture of 15 minutes SMS door entry alarm
hi guys this is my first instructable i hope you'll enjoy it !!

Got sick of the high prices of Home Security systems ??
have old mobile sets don't know what to do with ?
build a cheap alarm system that will notify you on your mobile by SMS.
ready ??

grab the tools !

Step 1: What you'll need

Picture of What you'll need
An old mobile phone set with supply (charger).
Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ).
5 volts Relay.
Soldering iron.
wires and thin insulated copper wires.
micro driller.
micro screwdriver set.
Scotch tape.

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graveyard_868 months ago

where did you buy the door magnetic alarm in Cairo ?

you have done a nice but only nokia phones only suppourt thats only bad luck

vkushwaha11 year ago

intelligent.. but how sms will send??? it may be that sms will send due to continue press of ok button of Nokia phone... but is it working on other phones??

can i know what is findings and specific objectives of this device my pleasure to know.

araps1 year ago
Men like you, make the world go round! keep going!
hey i am Egyptian too i am very glad that Egyptian people in instructables
مشكووووووووووووووووووور اخوي على هل المشروع الاكثر من رائع وانا بحيك من الاردن وان شاء الله للامام ونشوف اشي جديد
MSA ya Mostafa keep on, and I'm sure that someday you will be a great inventor ;). Bas sa3tha mtt3allish 3alina :DD
miffy12975 years ago
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.
PanadoL (author)  miffy12975 years ago
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.

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

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
miffy12975 years ago
Has anyone managed to connect wires to the light or sounder on a phone in order to switch anything on via a phone, any ideas.
Oooh, Oooh, I know. A BOMB!!!
PanadoL (author)  roland9854 years ago
wooops....got me... :o
PanadoL (author)  miffy12975 years ago
Yup...I've tried 2 ways, use a photo-resistor with circuit on the phone's display
and put them in a sealed box, when the phone receives a call its display will emit light, this light will operate the circuit. VERY SIMPLE
another way which I've tried but it's more complicated , is by using DTMF receiver circuit through phone's headset and controlling 10 relays through the caller's phone keypad.
for sharing any ideas or help with related projects, please contact me on my e-mail : bxon@hotmail.com
you could also arduino this to send an email to your cellphone... It would cost less than having a whole other phone's bill. As far as I know any cellphone provider gives their phone numbers email addresses.
I think a prepaid phone would be even cheaper.
Thanks a lot , i had wondered whether this would work , I had tried connecting to the vibrator in the phone but this proved too tricky,
manutea4 years ago
Nice instructables, I love its simplicity!
thanX 4 sharing this project
timotb5 years ago
I love the High School Ingenuity. (Yes, that is a compliment.)  .  If you guys  can get together and build a simple refined device that will use the cellular system to send a SMS alarm message, like what we see here only with refinement.....let me know.....there is a market for a cheap alarm notifier..
jules155 years ago
PanadoL, where did you get those special tools to open the phone case?
 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
i tried that last year and the relay is much easier
aussa5 years ago
Nicely done, I would recommend adding the wires to number button and adding your number to a speed dial assigned to that specific button. I made a similar thing in my car. But is triggered by the car alarm system ( in case I am away and cant hear the alarm)
 maybe you could make an electromagnet with a concealed switch outside the door so you can turn it on and off
macobt6 years ago
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
PanadoL (author)  macobt6 years ago
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
You could connect a loudpeaker and talk to the robber. Suggest alternative sources of income XD
PanadoL (author)  versanil5 years ago
LOL ,You know what , that may frighten him and he'll run away then :D :D really nice idea :D
macobt PanadoL5 years ago
my alarm.jpg
 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.
first tell me whether you have knowledge of electronics???
PanadoL (author)  macobt5 years ago
wow... that's much neater than mine :) what's that IC ??
macobt PanadoL5 years ago
Here is link to schematic very simple>
Regards Panadol
fkuk PanadoL5 years ago
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
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.
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.
batman96 macobt5 years ago
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.
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