Tiny GSM alarm system

We’ve covered this sort of thing before, but there is something to be said for the simplicity of this tiny GSM alarm system by [trax]. The alarm system is designed to send the owner a text message when a sensor is triggered. This alarm only works with Siemens phones, but it shouldn’t be too hard to find one.  The alarm is configured via a dip switch on the board and can also be armed and disarmed by text. The brains of this system is a PIC16F84A. The code and schematics are included at the bottom of the page.

[Thanks Dario]

21 thoughts on “Tiny GSM alarm system

    1. BS! you can get a tracfone that costs between $5-7 a month, how much does an actual monitored security system who will call you only and not the police cost a month and to install? Around a thousand plus probably a retardedly overpriced $50 or more monthly to monitor.

  1. @tjhooker:
    Well… no, not really. Stick a prepaid card in the alarm phone, those ten bucks will last you at least 20 break-ins. Then get a flat rate messaging option for your main phone, something many people have anyway these days.

  2. I thought of doing something similar for my motorbike. Some phones will keep the digits dialled on screen(before you press call) even while its asleep. all you have to do is hook up a quick and easy circuit to the close the green “call” button switch. If you use a prepaid sim it will cost £10 and last forever. type in your mobile number on the alarm phone and save the alarm phone’s number as a contact called “YOUR MOTORBIKE IS GETTING NICKED!”

  3. How easy/difficult would it be to achieve something similar to this WITHOUT the need for a mobile phone? I.e a microcontroller connected directly to a SIM card to send SMS an alarm?

  4. I like how it powers the phone, but on standby it can stay on for a long time, or just plug it in.

    But the interface to the one in opengpstracker is easier (the headphone jack is also a ttl uart interface) using a Motorolo C168i which is still available as of last month.

    http://www.opengpstracker.org/

  5. i’ve been thinking about something like this but without using a phone. I was thinking maybe for a mailbox alert system.

  6. Hey, I’m very interested in how you managed to do all that in the video. i’m trying to do something similar myself. You said that the code and schematic is at the bottom of the page yet i can’t find it, can someone point it out or send it to me? thanks

  7. I looked and overlooked the website, but the code and schematics are not included. If it’s impossible to put it available on the website, can you email me then?

    1. Look to the right of the title – there is an icon which says ‘More Info’
      Click on this and the project website link is named. it’s live as of today (April 2012)

      PS… Great tutorial, well done you’ve put a lot of work into this. Impressed! Thanks potential solution ideas on my projects.

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