GSM stands for Groupe Sp├ęcial Mobile. It is a standard set developed by the European Telecommunications Standards Institute (ETSI) to describe protocols for second generation (2G) digital cellular networks used by mobile phones.

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4
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1answer
196 views

Capture numbers entered during GSM call

I can't find any sources on how numbers are transferred during a phone call. I'm not talking about when dialing, but after the call is established. (like when you call an automatic bot and is given ...
0
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0answers
39 views

led is getting on but not getting off and gsm sim900A not receiving sms continuously

hello sir i am using the Arduino code below to switch on led by receiving an SMS. Led is getting on but it is not getting off. i am using simcom sim900A gsm modem. please help me in this regard. ...
0
votes
1answer
63 views

Echo effect during phone call [closed]

What causes echo effect in telephone lines during phone calls? Does it mean that someone is spying on telephone line or? When I talk with some people, it happens, and with some of them not.
1
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0answers
36 views

LCD Display Flicker When Arduino Main Board Supply Voltage to GSM Sheild Board [migrated]

I have a 16x2 LCD display that is connected to Arduino microcontroller. It is working fine but the LCD display flickers when I connect the Vin and GND of the main board to it's slave GSM Shield. I ...
0
votes
1answer
35 views

Error interfacing GSM with Atmega32 using UART Interrupt?

I am interfacing GSM with atmega32 using uart interrupts. I am using an external interrupt which is fired when a user press a switch and uart receive interrupt to receive the response of GSM. CODE: ...
0
votes
2answers
85 views

AT commands for GSM

I'am trying to interface a GSM module with flowcode for PIC and the Tutorial I'am following suggests a module SmartGM862 which is not available in my market but instead some other SIM900 series module ...
0
votes
1answer
39 views

Problem in GSM interfacing with 8051 (AT89S52)

I have been trying to interface GSM using the code and circuit from this link, since 2 days. only difference is that I am using AT89S52 and SIM900A module, but I am not getting any response like OK on ...
2
votes
1answer
52 views

Error interfacing GSM sim900 with atmega32

Hi all I am trying to interface GSM SIM900 with atmega32. I have a written a code in which if a user press a push button, a call will be made to a pre defined number. If we want to change the pre ...
0
votes
1answer
69 views

Extracting message content in SIM900

Hi all I am interfacing with GSM SIM900 with atmega32. I am trying to extract the message contents. User will send message like CHANGE7532167845 to SIM installed in GSM device. So to extract this I ...
1
vote
1answer
76 views

Error getting data from GSM SIM900

I am interfacing with GSM SIM900. I wrote a program so that I can read the SMS in SIM900. I have made a function to transmit and receive. Whenever msg comes, GSM responds with ...
0
votes
0answers
60 views

connecting speaker and mic to GSM SIM 900

I have a gsm module but unfortunately it doesnt have an output for mic and speakers. I need to integrate mic and speaker too. In my GSM module, there are male pins available for ...
0
votes
1answer
131 views

Error communicating with GSM SIM900 with AVR.?

I am trying to interface GSM SIM900 with AVR Controller. Till now I have done programming which transmit the command ATD and it makes a call to my cell. GSM response to this command by sending OK. I ...
0
votes
0answers
15 views

Telit 864 HTTP Config error

We are following the guide in the Telit Easy IP User Guide on page 56. However we are getting ERROR returned when we try AT#HTTPCFG. Here is an example of the command: ...
1
vote
1answer
77 views

How would you jerry-rig an android phone for continuous autonomous operation?

I want to use an android phone as dash-cam with GPS tracking capabilities. It is supposed to run 24 hours a day, 365 days a year. If the phone / app hangs, the user cannot be expected to ...
2
votes
1answer
59 views

Is it possible to multiplex SIM cards using a CPLD?

I am building a hobby project using a GSM module and would like to be able to switch between multiple SIM cards, in case one stops working or I have poor reception on one provider (the project will be ...
-1
votes
1answer
73 views

GSM layer 3 messages - System Information Type 2 [closed]

I have 2 questions regarding the GSM standard, specifically about GSM layer 3 messages: How often the network sends "System Information Type 2" to the cellular phone ? Does "System Information Type ...
1
vote
1answer
39 views

GSM module noise

I'm developing an embedded system that uses telit gl865 modem to connect to a server using gprs. I've noticed that the module makes a strange noise when connected. It's the same noise I used to hear ...
11
votes
1answer
360 views

AT Commands to transmit data through TCP/IP stack with LTE network

I need to design an embedded sotfware that will drive a LTE cellular device (like u-Blox TOBY L2 Series) and its TCP/IP stack to transmit some data toward a distant server. I'm waiting for the device ...
-1
votes
1answer
147 views

How to start using SIM900 mini V4.0 GSM board

I recently bought a quad-band SIM900 mini V4.0 GSM board (http://www.ebay.com/itm/SIM900-MINI-V4-0-WirelessData-Transmission-Module-with-Antenna-Cable-for-Arduino-/281493144780). My problem is quite ...
0
votes
1answer
77 views

sim800 restarts on battery but works fine on power supply

I am using SIM800L with PIC18F66J94 , but issue is that SIM800L keeps on restarting when powered by battery but works fine when powered by power supply . I have changed some battery to verify the ...
0
votes
2answers
78 views

GPRS HTTP 400 Bad request

I am facing some problem with GPRS Project. I am sending request to server through GPRS and receiving responce from the server. I have used AVR ATmega32 micro controller and SIM900 GSM/GPRS Module ...
0
votes
0answers
99 views

Quectel HTTP AT commands no response

I'm attempting to connect a Quectel GSM module to my arduino and I'm having trouble with connecting to the internet. Facts: SMS works, SIM is internet ready and tested in a phone, I have gotten a ...
1
vote
1answer
144 views

Getting GPS coordinates with GPRS/GSM module

I'm trying to understand if I can get GPS coordinates using only a gprs/gsm module. Probably I can do it by triangulation using BTS on the terrain and based on the RF signal but is that possible? ...
0
votes
1answer
40 views

GSM Power Control and Power Class

i know that the base station controls the power output of the mobile, keeping the GSM power level sufficient to maintain a good signal to noise ratio, while not too high to reduce interference, ...
1
vote
1answer
89 views

Help to understand/ explore small sized 3G and GPS Antenna Design

I recently came across an exciting device called Automile, from Sweden and what caught my eye is this - I am really impressed by the packaging and overall quality of hardware integration they have ...
0
votes
1answer
213 views

Unknown short-circuit between GND and ANTENNA pins of GSM module

I have a Quectel M72FA GSM module, brand new one. I have just soldered it onto my PCB and found that: there is a short-circuit between the GND and RF_ANT pins. This is the pinout: I have checked ...
1
vote
1answer
277 views

How can I accurately estimate the power consumption of a GPS tracking device?

I'm building a solar powered GPS tracking device using an Ieik Mini Nano V3.0 Atmega328p Board (based on Arduino Nano), Adafruit Fona GSM module, Ublox GPS module. The GPS module will transmit ...
3
votes
1answer
98 views

GSM/3G SoC reverse engineering for GSM/3G Layer1/2 PacketAnalyzer

I want to develop a GSM/3G Packet Analyzer for study purposes, a somewhat more simplified version of OsmocomBB but without any TX modules. As some of you may know, even though OsmocomBB is open ...
0
votes
1answer
329 views

How to interface GSM with 8051 microcontroller to send SMS?

I am doing a project on SMS sending through GSM using SIM 900 module and 8051. My code is: ...
0
votes
1answer
41 views

Location of modulation and multiplexing in a GSM network

My question is regarding the location of GSM channel access methods TDMA/FDMA. Here is an illustration how voice is processed before reaching the base station on a tower: It is not mentioning the ...
0
votes
1answer
176 views

Quectel m66 bluetooth usage?

I've been working on m66 and got it connected to PC via usb to serial converter, and got it up and running. AT command replies with ...
-1
votes
1answer
156 views

Why does GSM allocate 200kHz data bandwidth for each mobile phone?

I read that the human range is commonly given as 20Hz to 20,000 Hz. But GSM channels are carrier frequencies of 200 kHz bandwidth. Is that because of SMS part? It seems for voice 20kHz must be ...
2
votes
1answer
87 views

Confusion on GSM, GPRS, EDGE, 3G, 4G

I'm using a smartphone. When I turn off the cellular data or my mobile phone, I can still call and send SMS. Does that mean in this case the mobile using GSM? How can I know if it is GSM or GPRS? And ...
0
votes
1answer
153 views

File transfer between two gsm modem

I'm wanting to build a system that will store value on a SD card to form .CSV file , that this is not a problem. There will be about 1000 value recorded daily.I'm wanting to send this values to a pc ...
0
votes
0answers
42 views

SIM800L basic operation [duplicate]

I got myself SIM800L and have some issue with it. After powering up modem will not register to network. AT OK AT+COPS? +COPS: 0 OK SIM card was tested and ...
1
vote
1answer
565 views

SIM800L power interface

I would like to use SIM800L for M2M. I have power of 5V 2A for powering uC board and would like to add gsm module. It seems that SIM800L has rather strange voltage input rating: 3.4V - 4.4V. What ...
1
vote
1answer
57 views

connecting a GSM booster directly to a mobile device? [closed]

I live right on the edge of mobile reception. I just get a signal with an external antenna, but it is weak. I am thinking of getting a small indoors GSM booster, like this. I was wondering if it ...
-1
votes
1answer
108 views

how can we detect overspeeding through sensor or by building up circuit ??

I am working on project to detect overspeeding through sensor. but i am not getting any information regarding sensor. All i want to do, sensor inside vehicle with arduino and gsm which will send out ...
0
votes
0answers
60 views

Transmitting data over Long range ,using a Low Power Circuit

I Have Been Designing a BOT That Would Travel Along the Pipeline And Detect Leakage Using Ultrasound Efficiently,And Locate The Position of Leakage Using A GPS MODULE using the Arduino,I have make it ...
2
votes
1answer
444 views

GSM Modem will not register to network

After getting two modems (dev boards) Siemens TC35 and SIM900A I cannot get them to send SMS. From the research it seems that somehow SIM cards will not register to network. I bought three SIM cards ...
0
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0answers
91 views

GSM SIM900A Board and USBtoSerial

just got my SIM900A board same as Connecting GSM SIM900A module with Ardunio and I am trying to connect it to my USB-rs232 converter. I couldn't find any doc on module itself, has anyone done it? Tnx ...
-2
votes
1answer
971 views

How would I connect a GSM SIM900A v3.1 with Arduino UNO?

How would I connect a GSM SIM900A module with Ardunio Uno This is an image of it: Here is the datasheet
1
vote
1answer
121 views

GSM Battery/Amperage Usage

I have a general question. I have a GSM module (adh8066 link to data sheet below) that I purchased from sparkfun. In the data sheet, it states that in tx mode, the module can draw up to 2 amps @ ...
2
votes
2answers
644 views

GSM regulations for 850/900 MHz band and 1800/1900MHz

I understand that GSM regulations establish that transmissions power for two bands must be as follows, -Class 4 (2 W @ 850/900 MHz) -Class 1 (1 W @ 1800/1900MHz) But I also know that lower the ...
2
votes
3answers
176 views

least GSM power in dBm required to send an SMS

I deploy an application in the forest using an M2M module (SIM968). I have read through its datasheet but I am not able to find out what is the least GSM power that should be incident inside the ...
0
votes
2answers
156 views

Fuel Injection Control through OBD port?

I am trying to implement remote control of a car, by connecting a GSM device to OBD port. If someone is using my car, I need to remotely stop the vehicle by sending command. Upon sending STOP ...
2
votes
1answer
90 views

Can Cellphones/ be used for Ad Hoc Communication?

Can Cell Phones be (legally) used Adhoc, (ie, Point-to-Point) Communication? For example, let's say I'm in a remote area of the woods, or a valley. Can I configure cell phones to be used as true ...
0
votes
1answer
113 views

GSM modules or WiFi?

I'm trying to work on a prototype wearable indoor and I am really confused as to how I am going to transfer data fetched from the GPS device to the server. Is ...
1
vote
2answers
303 views

Is it possible to use SIM900 GPIO to control relays without using external MCU?

From the product manual / reference guide it looks like SIM900 / SIM900A is already equipped with 12 GPIOs. But could not find information on how to use these GPIOs to control relays directly, ...
0
votes
0answers
89 views

Low-powered sms > garage port opener

I have my car in a shared garage, with a standard 433mhz garage-port opener. I've been able to clone the opener, so I now have a tiny board with to cables that I can connect, and the garage opens. My ...