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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Powering GSM Module from 2 x AA NiMH or 3 x AA alkaline batteries

I'm trying to power a gsm modem from 2 AA NiMH batteries in series, and wonder what my options are. Main consideration is that it needs to be USB rechargeable, so I only have 2 batts to work with. The ...
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8 views

GSM ZTE MG2639 module freezes after checking SIM

I'm communicating with my ZTE MG2639 module through UART. Few seconds after powering it and getting +CPIN and +STKPCI it just turns off (goes to stand by mode) It only happens with SIM card, and ...
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7 views

SIM900 GSM module power LED on but can't get signal

When I connect my module to power the power LED stays on but I can't get signal LED blinking. I am connecting it to my PC via serial port and using Putty software. I am using a SIM900 Flyscale module. ...
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9 views

Using Arduino's hardware serial to control SIM900 [migrated]

I have a SIM900 board which has a serial interface. I'm trying to control it using Arduino Uno. I've tried using SoftwareSerial on pins 10 (RX) and 11 (TX) to talk to my board. It works OK with ...
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1answer
26 views

How to handle nested final result code in AT-command text?

I am writing a parser (a finite state machine to be more precise) for AT-commands and I don't see how to handle a particular corner case: Here is the specifications of the modem communication: When ...
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2answers
58 views

2.8V UART to 5V MCU - how?

I'm trying to connect ZTE MG2639 to 5V AVR (or USB<->RS232). This module is using 2.8V at IO. How can I do that? Normal voltage divider? And how to check if communication is OK in Putty? Just type ...
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0answers
23 views

Network time zone reporting in GSM module

I'm trying to sync my datalogger's RTC with the cellular network time. I'm using Ublox Leon G200 GSM/GPRS module. The AT command sequence is as follows:- ...
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28 views

SIM908c GSM module with Arduino Mega without any shield

I needed to work with GSM so I bought a SIM908c module. Also I bought a breakout board to connect with Arduino Mega. I am using the gsmlib library for this module. My connections are as follows: ...
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26 views

Cell ID Based Location

certain M2M GSM modules provide an alternative method of finding possition when GPS signals are not available or jammed through Cell Tower IDs. These Cell tower IDs around a device are transmitted ...
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30 views

EDGE/GPRS connectivity vs SMS connectivity through 2G GSM

I use a GSM module in my design which will be working in low signal areas such as inside forests. My application is designed to transmit information to a server via an SMS but I would like to use ...
2
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1answer
48 views

pick and place cannot read LCC module

The assembly house has a P&P machine (Yamaha i-pulse M4S) and the export file is from Altium. All components are read from the machine fine except an LCC gsm module MG323-b which has a particular ...
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1answer
187 views

Connecting GSM SIM900A module with Ardunio

I have bought an SIM900A Mini V4 GSM module. Here is the module, I want to configure with arduino to send and receive SMS. Do I have to connect TXD of this module--Tx of Arduino & RXD of this ...
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56 views

Sending message in the GSM module v4

I got a GSM module v4. It has SIM900A IC. I tried to send SMS by using arduino uno. This is my code. void setup() { Serial.begin(9600); Serial.print("AT+CMGF=1\r"); delay(1000); ...
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0answers
47 views

simple GSM SIM modem

I'd like to build a prototype of simplest possible GSM device - a simple modem with SIM holder, capable of logging on to the SIM's provider network and nothing else. It's meant to be used as a GSM ...
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41 views

Isolation between GSM and GPS antenna

We are doing a prototype for a gps based tracker. We got a problem in placing the GSM and GPS antenna. Both the GSM and GPS antenna are omni-directional antennas. In forums and application notes, the ...
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2answers
88 views

Does an antenna work inside a plastic box

I need to put two antennas for GSM and GPS communication on my PCB. My final product will be embedded in a user-friendly plastic box with buttons, leds and switches. I have not choosed yet which type ...
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0answers
51 views

Easy-to-use Antennas for beginners

I am designing an embedded system with a GPS and a GSM modules both from the u-blox company. I need external antennas for my GSM and GPS modules. From what I see when I looked for antenna integration ...
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1answer
53 views

Relationship of antenna size to gain and directivity

This question is derived from certain answers I received for a previous question I posted. Case : Let's say I have two GSM antennas of the exact same shape, design and material. The only difference ...
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1answer
48 views

Gain vs. Directivity and effect of animal body to Antennas

My design works in a foresty area inside a collar of an elephant. These areas have at least -110dBm GSM strength (accurate ref. map linked) but, usually higher as I live in a small country where GSM ...
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0answers
425 views

SIM900 Error on AT Command AT+SAPBR=1,1

I intend to send some information through GET method to a php page using a SIM900 module. I tried the following sequence of commands with success. My provider doesn't require username and password for ...
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1answer
59 views

Important Parameters to Check while Chosing a GSM/GPRS Antenna [duplicate]

what technical parameters decide the performance of a GSM/GPRS antenna? (excluding power consumption and size) I have found out several antennas that have 3dBi gain. And I want to chose between them. ...
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88 views

Servo shaking when GSM module starts transmitting

I have a project which uses 2 Arduinos which is communicated with my phone by a GSM module, and that one of the Arduinos is driving two servos. The question or problem is that my servo is shaking ...
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2answers
106 views

On Computing Power Consumption for a GSM system

I'm a software student trying to learn about embedded systems. I would like to build a low-power system that can send his coordinates by SMS and also receive SMS. Unfortunately I'm at level zero in ...
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2answers
371 views

Wavelengths blocked by a certain metal mesh

Introduction: I've heard about a theory, according to which you can check if there is any leakage in your microwave oven by putting your mobile phone inside and call it. However, I gave it a try and ...
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1answer
79 views

How to provide enough current for my GSM circuit, and still use a LiOn battery?

I am very new to electronics. I am building a simple GPS tracker prototype circuit that uses a 3.7 volt 500mah lithium ion rechargeable battery. The circuit has 2 major components: a simple ...
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2answers
80 views

SIM908 POST Request

I want to send a couple of variables to a webpage in my server over the SIM908. Does anyone know how do send such data over POST protocol? I was able to complete the task using GET but currently ...
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91 views

Sim 908 AT command not working

I am working on Sim 908 GSM+GPS module. I wanted to see if it works perfectly with the PC so I connected the module with the PC and ran Realterm (a terminal software). After a lot of tries of entering ...
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1answer
122 views

Costs of microcontroller with GSM module [closed]

First of all, I have to confess that I am a noob on this topic ;) Currently I try to realize a pet project with a microcontroller, which is connected to a GSM module. I've done some research and ...
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2answers
520 views

Powering SIM 900 gsm

I bought a sim900 (the chip itself, not a module) and have gotten stuck trying to figure out how to power it. I hope to power it using a pin from my RBBB arduino clone, which outputs 5 volts and ...
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1answer
58 views

Training sequence in a GSM frame?

I was reading about the GSM frames used in GSM communication. One thing pretty unusual caught my eye. Training Sequence: This is used by the receiver’s equalizer as it estimates the transfer ...
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2answers
421 views

GPRS data call using GSM/GPRS modem (Siemens TC35 and/or MC35)

I'm developing a data aquisition module, that amongst other things, it have to comunicate through GSM/GPRS module, since it will be a mobile application. I can connect to the module and send sms's ...
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2answers
297 views

SIM908 GSM and GPS modules individual power control

I've been searching around google and even in manufacturer site for this information and found nothing relevant. Is it possible to turn off GSM module and keep turned on the GPS? How can it be done? ...
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2answers
626 views

How to Make Sure SIM900 modem will always give me +PSSUTTZ string?

I am using SIM 900 modem to enable GSM connection wirh my product. Micro-controller Communicates with SIM900 modem through a SET AT commands over UART. My product is time critical and i need to have ...
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0answers
58 views

Can't establish GPRS connection from controller command

I am posting this question out of frustration and i lost hours to figure this out. I got a GSM module that works fine and can be commanded with AT commands. When i command it from REALTERM it responds ...
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1answer
210 views

Losing sensitive data when trying to send them via GSM

I am working on a system which collects data from a set of ultrasonic sensors. Those sensors work at 40Hz frequency, and each data they send are valuable to me. I need to send those data to a mqtt ...
2
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1answer
334 views

AC/DC 4W vs 2A GSM transmission bursts

I have a big problem with the power supply of a SIM900. I designed my own board with a 220VAC-5VDC tracopower, an ARM9 CPU, and a GSM/GPRS SIM900 module. The output of the tracopower is 5V - 800 mA ...
3
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1answer
172 views

Receiving empty data from gprs module? [closed]

I am trying to send a string from a Huawei MU509 GPRS modem to a Linux server over the internet. I am using an AT command tester to simulate AT commands. After giving the ...
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1answer
209 views

Powering an iComSat GSM Shield and a Gear Motor with LiPo Battery

I have an iComSat GSM Arduino Shield (based on the sim900) and a gear motor that I am planning on using with a Teensy 3.1 microcontroller. I'd like to power the whole rig using a 2000mAh LiPo Battery ...
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1answer
87 views

What is the proper GPRS / GSM modem setup to work with 5 voltage sensors?

I've been looking at modems and most of them come in RS232/485 input only. I need to hook up 5 different power cables to the modem to monitor their voltage. Some of the modem's I've found have 4 to ...
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1answer
131 views

GSM module working when powered by laptop via USB but keeps restarting when powered by battery

I am using a sim900 module in the following link and I connect it to my laptop using USB to TTL converter and the module works properly. But, when I connect the same module to 9V DC battery the module ...
0
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1answer
321 views

GSM SIM-300 read msg problem

I'm unable to get a proper response from my GSM modem300, sometimes it responds with nothing, sometimes it replies half of line of ONE message from full inbox, sometimes it just sends the command ...
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1answer
1k views

What is the difference between SIM300, SIM900 and SIM900A

I have came across these SIM modules on an online electronic shop. My primary target is just to receive short text messages from other subscribers. But then this question about these three (if there ...
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1answer
198 views

GSM 3G VSWR and antenna testing question

I'm a recently converted SW engineer to EE (Graduated less than 3 years ago, BS in Comp Eng, focus on Digital hardware) and I've been made the hardware lead on a project here at work. The project is ...
1
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2answers
880 views

sim900 escape character error

I am trying to send some hex data over TCP using SIM900A module. But the sequence of data has a byte with value of 0x1B which is the escape character. As a result the module terminates the command ...
2
votes
2answers
3k views

Longest range remote control

I would like to make a long range (5Km) quadcopter. As of right now, I'm just trying to find out the best way to control it. I know that there are some 5Km R/C transmitters but they are the size of ...
1
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2answers
481 views

GSM vs Bluetooth shield for android to arduino communication [closed]

I need to communicate between a hacked android device and an Arduino primarily sending signals to turn on lights. No voice data. I was under the impression that Bluetooth is the best solution but ...
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1answer
106 views

Doubts related to SIM300 power rating and its configuration?

I just started reading SIM300 data sheet (http://probots.co.in/Manuals/SIM300.pdf). Under the section 5.3 Power supply ratings.I have few following doubts i) peak supply current transmission is ...
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0answers
302 views

SIM cards not responding to SIM908 module

I have a SIM908 module on a dev kit board. I have three SIM cards that are all detected fine on the previous version of the board. However, the v2 only detects one out of the three SIMs. I put the ...
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2answers
765 views

Microcontroller with integrated GSM & GPS support? [closed]

I am looking for a single chip microcontroller with GSM & GPS solution. Is there any microcontroller chip which is specifically available for GSM & GPS solution? So that it will act like ...
2
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0answers
42 views

Why is GSM interference audible? [duplicate]

We have all heard the buzzing sound that your speakers makes when you use your phone near your radio or amp. My question is why does one hear this interference if GSM operates at ~800-900MHz which is ...