This module produced by Quectel, too, is GSM/GPRS (GSM Phase 2/2+) compatible and is a Quad-band type; the radio section works at a frequency of GSM 850 MHz, GSM 900 MHz, DCS 1800 MHz, and PCS 1900 MHz. GPRS compatibility occurs in class-12 multi-slot modality, schemes CS-1, CS-2, CS-3 e CS-4. The GPRS connection supports…
This is a GSM/GPRS-compatible Quad-band cell phone, which works on a frequency of 850/900/1800/1900MHz and which can be used not only to access the Internet, but also for oral communication (provided that it is connected to a microphone and a small loud speaker) and for SMSs. Externally, it looks like a big package (0.94 inches…
Commands and settings can be sent by any cell phone via SMSs, as long as the message in question contains a password. Some of the commands can be composed without the use of a password (just so that they can be composed faster), provided that they are sent from one of the first eight numbers…
A modular solution allowing for the use of a single circuit for numerous functions, such as gate opening, bidirectional telecontrol, and many others. It adopts a newly-conceived low-cost GSM/GPRS module. Nowadays, creating a remote control is much simpler and safer than it used to be, even if it is to be used from the other…
Let us start by describing the device’s electric scheme in its entirety, that is, along with all its components; we should also state in advance that the module we call GSM is, in reality, the small board hosting the cell phone, so the pin numbers refer to the contacts of the pin-strips that have been…
Now that we are familiar with the structure and functions of the base circuit, we can look at how it is built; let us state in advance that its realization presupposes a double-layer printed board with metallic holes, a choice we made in order to be able to reduce the overall size of the device….
Download the article Do you still think you need GPS to know where a person or vehicle is? Well, here is some news for you: by using cellular network data and properly querying Google, even a simple GSM module is able to determine one’s position, with a fairly acceptable error margin. Although…
Regardless of how Google has compiled its database, once we discovered how cell phones using Google Maps Mobile send their requests, we immediately thought of employing that functionality to build a specific remote localizer, which, unlike those that have been proposed so far, relies solely on GSM/GPRS for its radio connection, rather than use a…
The module used in our localizer is the Enabler IIIG GSM0308 by Enfora, one of the smallest yet best performing modules of this type currently available. The device, which utilizes a chipset made by Texas Instruments, is but 1.06 x 1.10 inches, is a quad-band that works both in Europe and the US, and has…
In order to be able to associate a GSM cell with its geographic coordinates, we utilize a Google Maps Mobile function, which is not documented, though. Before doing this, however, we need to know which cell the remote GSM device is connected to, that is, we need information regarding MCC, MNC, LAC, and CID. To…
The circuit our localizer is based on consists only of a quad-band GSM/GPRS module interfaced with a a microchip microcontroller which, after initializing the I/Os and UARTs it has at its disposal, puts the main program in a loop waiting for some event, which could be the arrival of an SMS or someone pressing the…
Our localizer is definitely simple, yet it must be built with care, as all of its components are SMD. Once the two-sided board is ready, be sure you have a very fine-pointed welder of up to 20 watts and a 0.02-inch-diametered (possibly, even smaller) welding thread. First of all, take care of the microcontroller; solder…
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