GSM stands for Groupe Spécial 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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Sim900A Breakout board is not working

I'm using sim900A breakout board. It has UART interface with it.I'm trying to interface with PC. Module has 8 pins. Vcc,DTR,TX,RX,MIC+,MIC-,Speaker+,Speaker-,GND pins respectively. Here I have two ...
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57 views

What is more power efficient: GPRS or SMS for a GSM sim Arduino application?

I have a GSM shield for my Arduino and am wondering the most power efficient way to receive and send data from and to the cloud. The specific project I am looking to accomplish is starting my car ...
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37 views

Which pins does the Efcom 1.2 GPRS shield require to be connected in order to work?

I have this GPRS shield for arduino and I'd like to use it later on with some other standalone microcontroller. I have not been able to get it working though without connecting it to arduino and I ...
3
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1answer
61 views

What is the antenna gain of a mobile phone?

I'm working on a GSM/3G Project and my team has a small doubt about antenna gain selection. All along we were using a 3dB PCB Antenna connected via U.FL/IPEX connector. The antenna does a good job ...
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1answer
70 views

How to measure the temperature of a fridge with arduino?

A want to make a system with arduino to measure the temperature of many fridges and send SMS if temperature is over limits. I am wondering how to measure digital temperature without putting wire ...
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2answers
98 views

Does A-GPS require a GPS antenna?

I have a good understanding A-GPS functionality. I understand that assisted GPS is used to improve TTFF, works better indoors but costs more as you are using the mobile networks to determine the ...
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2answers
58 views

Transmit location data globally [closed]

While looking at products like: https://www.victorinox.com/global/en/Products/Travel-Gear/Accessories/CheckSmart-Luggage-Tracker/p/601169 This product is able to send some data about the location/...
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3answers
185 views

No communication with SIM900A using Arduino Uno

I am using Arduino Uno and trying to connect to a SIM900A GSM module using serial communication. I am not receiving anything from the module at all. The module powers on and has another LED flashing ...
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0answers
37 views

How to connect capacitors to SIM800C gsm module [duplicate]

I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens ...
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1answer
84 views

SIM900A Strange Problem

Please refer to above circuit. I have a SIM900A module connected with the UART of a PIC. D1 toggles every second, using timer interrupt, to indicate that while loop is running satisfactorily. D2 ...
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1answer
155 views

Help SIM5320 Breakout Board construction for Raspberry Pi model B

I need a breakout board based on SIM5320 for experimenting web server http requests. I've found the board shown above in adafruit library and thought of using it as reference and slim it down to the ...
2
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1answer
54 views

GSM modules and ICs

I have been looking for GSM modules and found some very interesting devices, such as the SIMCOM 7100C and similar. The "problem" I have with these is that they are very high-level, that is, you can ...
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1answer
107 views

What does the GSM AT+CSQ command output signify?

So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify? ...
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1answer
71 views

Can i directly connect a gsm shield to a computer without using arduino?

Ok, i've bought a gsm900 in alexan, and what i bought was a gsm shield thinking that it is really just the same only that shield can be placed directly in an arduino. The problem is that, im trying to ...
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1answer
40 views

GSM Frequency Hopping

with System information Type 1 and Immediate Assignement, How can I find frequency of hopping channel in GSM? So I'd like to print frequency of hopping channel
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1answer
68 views

powering up the arduino and gsm shield module

i am just wondering if what i am thinking is safe for my modules. I want to power up my arduino x which rated at 5vdc/1A and my gsm module rated 5-9vdc/1.5A, using my bandspeed adapter that has an ...
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1answer
52 views

Identify GSM / LTE antenna plug

From my GSM provider I have bought a stationary Internet access point from LTE. Additionaly I have bought an antenna for it. Unfortunately when I was plugging it together I have damaged the plug. (...
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1answer
54 views

GSM/GPRS reach for Class 4 2W 900MHz/ Class 1 1W 1800Mhz

I'm studying differents GSM/GPRS modules and all of them have two operation modes depending the frecuency (900MHz and 1800Mhz). If I'm not wrong, for the same power higher frecuencies have a lower ...
3
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1answer
184 views

Does my PCB Require 50 Ohm Impedance trace even if i am using external antenna?

I am using the Quectel M95 GPRS Modem in my PCB, and the hardware reference guide says "The Pin 39 is the RF antenna pad. The RF interface has an impedance of 50Ω. " I am using a u.efl connector and ...
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1answer
142 views

Quad Band GSM PCB Antenna

I am making a GSM + GPS Board, and we don't want to put an external antenna on top of it via any sort of connection. Primariliy to reduce the cost. I've seen a VTS system with an onboard antenna ...
0
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1answer
76 views

Is there altitude limit for GSM(SIM908)? [closed]

I'm using GSM(SIM908) in the machine. I need to know whether there is an altitude limit for gsm to operate. Does GSM just stops working after reaching certain height? I will use SIM908 or SIM808.
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238 views

How to initiate a call on a GSM module from DTMF tones

Can someone tell me if it is possible to make a call from a GSM module using only the DTMF tones that a keypad puts out? If not, can someone explain how I would make the call using only the keypad, ...
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2answers
91 views

What (exactly) does a GSM module do [closed]

What (exactly) does a GSM module do? I know that it connects whatever it's wired to to a GSM network, but what is its role? Does it just relay the dial tones to the network or does it actually ...
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1answer
93 views

Protect soundsystem from GSM/GPRS pulsing noise sounds [closed]

What is the best way to isolate soundsystem from an modem/cellphone to not hear pulsing noise sounds when GSM/GPRS communication is active.
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1answer
332 views

GPS consideration for PCB with GSM (interference, setup etc)

I am working on a project which has a GSM and GPS on the same PCB (fairly near each other in an enclosure). Since I am not familiar with GPS I was wondering if any of you could give me some tips on ...
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1answer
511 views

How do I fetch data from the internet with a GSM module using GPRS? [closed]

Recently I have built a device using Quectel (GSM/GPRS module) interfaced with Atmel MCU. It will control another device using SMS received by that GSM module. Now I am trying to connect it to the ...
4
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3answers
428 views

How to control a cellphone using an Arduino?

I wish to control a classic cellphone using an Arduino Nano by connecting the cellphone keys to digital pins, and switch them using a program that I will put on the Arduino. The idea is to make a ...
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1answer
120 views

Check GSM Module Status

I tried to send "AT" command via UART at some baudrate to my Cinterion BGS2T, and I am always getting response "ERROR". I get error on every AT command. How can I know what is wrong, or how to check ...
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2answers
193 views

Sending battery info attached with GSM through SMS

I am writing a C code for receiving battery using GSM modem SIM 800E. I am using AtMega16 uC. Here I have used AT commands to get battery info. ...
4
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1answer
285 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 ...
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1answer
153 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.
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1answer
120 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: <...
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2answers
277 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 ...
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1answer
344 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 ...
6
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0answers
412 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
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1answer
96 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 ...
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1answer
139 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 ...
2
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1answer
880 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
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1answer
336 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 ...
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1answer
97 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
102 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 ...
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1answer
627 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
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1answer
101 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 ...
10
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1answer
789 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 ...
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1answer
482 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 ...
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1answer
805 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 ...