Signal detection mobile phone
HenkieD
Posts: 8
Hi,
I'm looking for a circuit to detect mobile phone activity in a range of max 3m.
I will explain myself and the project...
I need to build a remote gate opener with 'caller id check', for a complex with several gates.
This would only be possible if each entrance to the·complex would have it's one 'unique' id ... this means x times a
gsm/gprs modem.
To overcome this, I can use one modem and a mobile phone detector connected to a stamp at each gate, communicating over
rf with the master (where the gsm modem is connected to). The idea is to check which gate detects a mobile phone when the
master gets an incoming call.
As you see, the detector doesn't have to be fancy, it just needs to close a contact if there is a cellphone nearby.
Thanks,
Henk
I'm looking for a circuit to detect mobile phone activity in a range of max 3m.
I will explain myself and the project...
I need to build a remote gate opener with 'caller id check', for a complex with several gates.
This would only be possible if each entrance to the·complex would have it's one 'unique' id ... this means x times a
gsm/gprs modem.
To overcome this, I can use one modem and a mobile phone detector connected to a stamp at each gate, communicating over
rf with the master (where the gsm modem is connected to). The idea is to check which gate detects a mobile phone when the
master gets an incoming call.
As you see, the detector doesn't have to be fancy, it just needs to close a contact if there is a cellphone nearby.
Thanks,
Henk
Comments
Is this to be connected to a BASIC Stamp? Your question does not mention the BASIC Stamp but is located in the BASIC Stamp Forum. Assuming it is, I recall someone in the forums who used a similar method of security using his Cell Phone who turned on Blue Tooth and used our EB500 to detect the MAC address to allow entry.
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Chris Savage
Parallax Tech Support
Yes, the idea is to hook it up to a few stamps, each for every gate.
Each stamp gets his own 'gsm nearby detector', and sends this information via rf to the master, which will be a stamp with rf connected on, a max 232 to exchange data with a pc (who is checking if aces is allowed). Via the same rf a signal will go back to the stamp that triggered the master if acces is granted. Everything get nicely stored in a log.txt. The Acces information goes into a MDF file.
If you know somebody with such a circuit, please let me know.
Best Regards,
Henk
The reply was gone before I finished ...
The reason why I'm not going for Bluetooth is that not everybody has a bluetooth enabled cellphone, and this application must be accesible from the most sofisticated cellphone to the heaviest brickphone, with little explanation to do to the end user (read KISS).
A disadvantage of the setup is that you still rely on a provider, and without contract you get kicked from the network as soon as your prepaid conditions expire.
Best Regards,
Henk