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| Electronic Projects Design/Ideas/Reviews Are you building an electronic project or want to? Maybe you need some assistance? Come and submit your electronic questions here and let our experienced members find a solution. |
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| New Member | hello all, new to site would realy be greatfull for any help or views on following, i am in process of building home burglar alarm system and would like to know what device would activate a mobile gsm phone to ring a last dialed number, my other gsm phone that would allert me when my house alarm has been triggerd, was looking for device that i would be able to build myself and ad to alarm pannel, many thanks, cctv. |
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| Experienced Member | most of the gsm phone has a built in modem that can the controlled be At command set . so if you can give that command to the phone (interface depends on the make) , it can dial a no
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| New Member | aKG, thanks for info, have only limited electronics experiance but gather that you were saying to programe gsm phone to accept external command to ring when house alarm has been triggerd, how do i programe gsm also what device attached to alarm controll pannel would send command to gsm to ring, thanks for your help aKG, cctv. |
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| Experienced Member | Quote:
For extra info....google "ericsson at commands"
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| New Member | Tarsil, could you give basic diagrame explaining your info, also what device linked to alarm pannel would give command for gsm phone to dial last dialed number, did not want pc connected if poss, i know of landline comunicator device that would dial numbers for landline phone but will not ring gsm, many thanks for info, cctv. |
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| Experienced Member | Quote:
__________________ If is too complicated.....most of the times is the wrong way. | |
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| New Member | U may try a simple solution with a GSM phone with speed dial . U may connect a relay NO contact ( reed or other tipe ) actioned by the burglar alarm over the speed dial key previously set to ring u'r other gsm . |
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| Experienced Member | Quite right sho_gun, this is how I phone-enabled my motorbike alarm - I used a PIC chip to switch two small relays connected normally open over two number keys on an old un-cased Nokia 6210, and a third one over the "hangup" button. It would dial one number, wait 10 secs and then hang up and dial the other number. It would continue every five minutes to do this until the alarm was disarmed by the key fob. Very simple to set up, and I was spoilt for choice as far as phones went! |
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| Experienced Member | Quote:
Components aren't too critical, just don't forget the diodes! And, your phone needs power from somewhere.... I didn't include the 5v PSU for the PIC chip as these should be easy to do (Mine actually ran at the 4.6v off the PSU for the phone). Your alarm input from a domestic burglar alarm may be the opposite polarity to the circuit shown so just change the software accordingly (this one is activated by 12v appearing on the alarm trigger input). I'd suggest taking this input from your bell box or siren output on the alarm panel, and just check to see whether its showing volts or grounded in its "sounding" state. I used an old Nokia, timings for the software should work for most Nokia's including the newer ones. 6210's and 3210's are ideal and cheap though, just strip the guts out and solder the relay contacts straight to the keypad PCB and you are away. The software I used was a lot more complicated and written in assembly, but I just whipped up (and tested) a simple BASIC program to show how it works; - Quote:
Taking the circuit further, you could perhaps use a 16 way analogue cross-point switch to control the keypad, which will give you enough keys to sent a decent text message as well....... or store a short encoded speech message (maybe a couple of seconds) in the program memory area of the PIC chip, and play that through a simple R2R ladder DAC to the MIC input of the phone ("Alarm! Alarm! Alarm!") over and over again during the 30 second dialing routine. Hope this gives you some clues! Last edited by Madhouse; 3rd October 2006 at 10:14 PM. Reason: missing attachment | ||
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