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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6
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2answers
285 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 ...
0
votes
1answer
33 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 ...
0
votes
1answer
29 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 ...
0
votes
0answers
20 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 ...
0
votes
1answer
72 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 ...
1
vote
2answers
96 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 ...
1
vote
1answer
28 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 ...
2
votes
2answers
132 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 ...
0
votes
1answer
145 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? ...
0
votes
1answer
160 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 ...
0
votes
0answers
44 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 ...
0
votes
1answer
121 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
votes
1answer
175 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
votes
1answer
148 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 ...
1
vote
1answer
132 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 ...
1
vote
1answer
58 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 ...
1
vote
1answer
79 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
votes
1answer
269 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 ...
0
votes
1answer
801 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 ...
1
vote
1answer
154 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
vote
2answers
544 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
1k 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
vote
2answers
358 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 ...
-2
votes
1answer
88 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 ...
1
vote
0answers
247 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 ...
-2
votes
2answers
485 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 ...
1
vote
0answers
41 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 ...
1
vote
2answers
92 views

Collecting data from GSM devices

this is my first question on electronics, so I hope I will get it right. :) GSM and GPS are topics which are quite new to me, but I will try to be as clear as I can. Is it possible to collect data ...
3
votes
2answers
205 views

How to pick the right capacitor for device with significant current peaks?

I'd like to power the GPRS modem (uBlox LEON G100) with a 4V 500mA power supply. How can I calculate the capacitor parameters so that they will provide the necessary current for TX slots? The ...
2
votes
2answers
399 views

SIM card for SIM908 module

I just got this SIM908 dev board, and I'm trying to get it working. However, it keeps telling me "SIM not inserted": AT+CPIN? +CME ERROR: SIM not inserted which ...
1
vote
0answers
574 views

Gsm sim900 cannot read sms

I am using an arduino uno r3 with a sim900 module. I can send messages and make voice calls using https://github.com/jgarland79/GSM_Shield but I cannot read any sms messages. The getsms function ...
1
vote
1answer
442 views

How can I attach a microphone and speaker to the Arduino GSM shield?

I recently purchased the Arduino GSM shield so that I could build my own low-tech cellphone. Now that I've successfully been able to send and receive text messages, I would like to add the ability to ...
0
votes
0answers
1k views

Correct AT Commands sequence for Quectel M95 GSM module

I have easily managed to connect the M95 GSM module to an Arduino and can communicate. I want to have a very basic way of posting data to a website from the Arduino. It seems the AT commands are ...
21
votes
4answers
1k views

Is an omnidirectional antenna a must for a cell phone?

I have read somewhere (but unfortunately I am not able to remember where) that cell phones do need an omnidirectional antenna. If it is so, what are the reasons for that? Why a normal directional ...
1
vote
3answers
3k views

What AT command should be sent by modem to get time?

I am using SIM800E. I want to know what AT command should be sent by modem to get time ? This modem is having an RTC. But I need to set it automatically through cell tower. The tower can send the time ...
1
vote
1answer
449 views

netduino plus 2 compatible gps/gsm module

I have a netduino plus 2 board and I am trying to send gps location with gprs to my server.I am a java programmer by profession,but recently I got interested in IoT and m2m communications.I would like ...
-2
votes
1answer
143 views

anyways to receive data from the GPS module with GSM/GPRS [closed]

Am doing a project using the GPS. the main scenario is to display the position of the object in the maps. Scenario : am plan to use a GPS Antenna in the Arduino/Netduino board. where i will code to ...
0
votes
0answers
171 views

Indoor Phone/Tablet tracking with multiple nodes

I'm looking into providing a distributed device tracking system using a number of separate nodes to detect Wifi/Bluetooth devices by their MAC addresses. (It's to power an app, not for secret ...
1
vote
2answers
392 views

GSM/GPRS AT command - hitting a link

I am trying to target a specific page (script) on my webserver using a GPRS modem. I can hit my domain, and get a reply back but then when I am trying to call my script it just won't let me: ...
-1
votes
1answer
74 views

How to combine two independent estimates of location

For finding mobile location we know two methods: Trilateration of signal strength and Timing Advance. Now to improve accuracy we need to use both methods simultaneously. We are able to use both ...
2
votes
2answers
173 views

Pull signal low using a pic microcontroller

I'm working with a ADH8066 GSM Module and a PIC16F688. I want to reset the ADH8066 using the ON_KEY pin which is described as: ...
2
votes
2answers
113 views

ADH8066 with Bus Pirate

I have an ADH8066 GSM module that I'm trying to get up and running. I'm powering it with 4V (via a 2A adjustable regulator), and I'm using a Bus Pirate connected to its RX0 and TX0 lines. I'm not ...
0
votes
1answer
452 views

Trying to find location in GSM network

I am using a GSM modem by Simcom SIM 800E. I'm interfacing it over the serial link. I am passing command AT+CSCB to get the location. But I am not getting it. I ...
2
votes
1answer
91 views

Signal the MCU using GPRS

I am working on a project with a GPRS and MCU. I am feeding the data to my server via GPRS, it's socket server. I was wondering if there is a way ( AT Command ) to do the reverse, I mean I like to ...
0
votes
1answer
159 views

Embedded project using Mux and Demux for antenna

In our current embedded project we are implementing a GPS ,GSM and Wifi Module. To connect these modules to external antenna board,separate SMA cables are used.As our design requires each of the ...
3
votes
2answers
7k views

Receiving SMS using GSM and controlling LED using Arduino

Has someone come up with a solution with the above stated problem? We are using Arduino Duemilanove and SIM 900 GSM module ...
2
votes
1answer
81 views

Embedded board level functional test at factory

My embedded project has a GSM and a GPS module. What is the best way to test the radios of these modules after the production of CCA like in a factory conditions.I was thinking of signal generators ...
0
votes
2answers
1k views

arduino-sim300 gsm communication

I am establishing a serial connection between the arduino uno and the sim300 gsm module.One way of doing is removing the max232 circuit and soldering tx rx wires from there onto the arduino board. A ...
0
votes
1answer
385 views

Using Arduino Uno to Log GSM Air Interface Messages

Is it possible to log the GSM Air interface messages that are sent between a GSM Module and the GSM/WCMDA network using an Arduino Uno? Basically, I want to log/record all the GSM messages of the Air ...
1
vote
1answer
940 views

How many functions can I put into an arduino uno? [closed]

Is it realistic to put the following: GPS module, GSM module, SD card slot and about 4 analog sensors into Arduino uno? (have not yet goten an Arduino in my hands).