Questions tagged [gsm]

GSM is a very widely used standard for communication over mobile phone networks.

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SIM808 module restarting repeatedly

I have bought SIM808 module, everything working fine. All AT commands are giving expected response, i'm accessing it through hyperterminal. My problem is that whenever i make or receive a call or SMS ,...
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251 views

GSM serial get event or read the whole input?

I am using an Arduino Uno with GSM shield, trying to read some SMS. Here is my code. #include <SoftwareSerial.h> SoftwareSerial SIM900(7, 8); char incoming_char=0; void setup() { Serial....
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1answer
394 views

Insert Variables In AT commandes [duplicate]

I'am trying to apply USSD operation with variable codes, for example this piece of code return my account balance: gsm.SimpleWriteln("AT+CUSD=1,\"*100#\""); i want to change "*100#" to ...
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No reply from GSM module

I have an arduino due sending and receiving data from a server using a GSM module (UBLOX SARA-U270). The issue I am having with it is that after a period of time working correctly the module stops ...
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2answers
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Having problems registering my SIM800 with the network

I have a SIM808, connected via hardware serial to an Arduino Mega. Communication between the Arduino and the SIM808 is fine. However, the quality of the signal is listed as 0 all the time. (AT+CSQ) ...
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1answer
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Strange characters after typing an AT command in serial monitor

I'm trying to test AT commands (I am working with an Arduino Uno and a GSM/GPRS SIM900 shield; my system is ubuntu 14.10) . Yesterday when I was testing , all ran well.. For example after typing AT+...
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1answer
2k views

Is the A6 module broken?

Hi recently I've could send some messages with the A6 GSM module, which uses AT commands. To switch on the board, you need to press the power button about 4 seconds or connecting the VCC pin to the ...
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1answer
1k views

GSM module connected with arduino uno giving garbage values in response

I connected a GSM module with the Arduino UNO. The connections are as follows: Gnd of gsm -----> Gnd of arduino TX of gsm -----> pin 9 of arduino Rx of gsm -----> pin 10 of arduino GSM ...
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1answer
2k views

SIM800L GSM Module, no network signal RSSI

I am using a GSM 800L module to send SMS messages. When I test the module with Arduino, it shows a 0 : -115dbm signal strength. So basically there is no signal. SIM800L is a quad-band GSM/GPRS module ...
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1answer
870 views

2G/3G vs 4G/LTE Cell Connectivity for Sensor Prototype? [closed]

Would love any advice on Arduino cell connectivity. From what I understand: 2G (GSM/GPRS) is a dying technology. AT&T is shutting down its 2G network on Jan 1, 2017. 2G (CDMA) will have a longer ...
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1answer
937 views

GSM shield 2 - Fully erase memory buffer

I would love to get real developers' input regarding the following issue as I've been spinning my head around it for a while now. What I'd like to do My program receives SMS containing simple ...
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1answer
145 views

GSM and NFC not working together

I have an Arduino Uno board, Seeed Studio NFC shield v2.1 and, an Arduino GSM shield stacked UNO -> NFC -> GSM, therefore, all the wires are going into pins in the GSM. I have successfully created a ...
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0answers
217 views

Getting some unknown characters while trying to connect my SIM900A to my PC [closed]

Im trying to connect my SIM900A. While trying to connect I'm getting some junk characters and not able to pass A T Commands Attached are the screen shot. Note:- Im getting the blue light blinking....
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1answer
1k views

How to connect GPS Neo-6M module to GSM Shield SIM900 V2?

I'm doing my final year project, My project is based on "Arduino Real Time Gprs/Gsm & GPS Tracker". So Now I have purchased the hardware components such as: Arduino UNO R3 GSM Shield SIM900 V2.0 ...
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0answers
269 views

GSM librarys Software Serial conflicts with I2C pins 2 and 3 for Arduino Micro

The GSM library apparently uses the Software Serial library to perform the communication. The Arduino Micro specified pins for the serial connection to the GSM is pin 2 and 3 (doc says, but see def of ...
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1answer
743 views

how to measure level shock using vibration sensor and arduino

My project title is about crash detection, by using this kind of vibration sensor. When the sensor reads the shock (which is when I knock the sensor) more than 50, it assumes it's a crash and will ...
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1answer
8k views

Sim900 error on AT command AT+HTTPINIT

I want to send data to my php server using sim900 module but I am unable to initialize http service on sim900. code: #include <SoftwareSerial.h> SoftwareSerial gprsSerial(8, 9); void setup() {...
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1answer
671 views

Does the SIM800L works in the US?

I want to know if the SIM800L works on US soil? I can´t get it to work on the H2O network! Does it work wit ATT or I only need the APN settings? If so what are the commands for data connection and ...
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1answer
333 views

Sim800L's library can not compile on Arduino Due

Sim800L's library can not compile on Arduino Due. Is there any way to create a library for Arduino Due? #include <Sim800l.h> #include <SoftwareSerial.h> Sim800l Sim800l; char* text; char*...
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1answer
855 views

Input PUK code, when requested

Problem: I'm working with a GPRS module (the same as in the Arduino GSMShield). In some cases the PUK code is requested, and the PIN is thus locked. For this I wrote some code (which can be seen ...
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1answer
722 views

Why the GSM Shield is discontinued? What options are available?

I need to build a device with a single button to make a call over a mobile network (GSM) I wanted to buy an arduino one and an arduino gsm shield for this, but just noticed that the GSM Shield is ...
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1answer
336 views

Utilizing 3G/4G connection as gps

Is it possible to get GPS data without using a GPS, but instead using the internet provided from a 3G or 4G connection to get GPS data? Maybe if you used the HTML5 geolocation API somehow? I have ...
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1answer
3k views

How do I clear sim800L buffer?

Let's say that I've tried sending an SMS directly from serial monitor or any kind of terminal. For whatever reason (syntax error, etc), my attempt fails. Now, I try sending it again, but this time by ...
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1answer
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GSM and Bluetooth modules on 1 Arduino Uno board

I couldn't find anything on this topic. Task: to connect sensors to Arduino board via Bluetooth module, process the received data and then send the data to server via GSM module. Question: Is it ...
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3answers
17k views

SIM800 gsm Module returns 0 on AT+COPS?

I am using SIM800 Module with Arduino Micro. It reponds well to basic AT commands. But i am unable to send SMS from this module as: AT+CMGF=1 ERROR Now while further debugging i saw AT+COPS? Returns ...
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2answers
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SIM800L module just repeating data sent via serial

I've got a Teensy 2.0 with simple AltSoftSerial as displayed on image: As you can see, when I send a command (or any other input via serial) the SIM800L module sends me the same input. I tried to ...
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1answer
3k views

Using Arduino GSM with WiFi

I have a project that requires data to be sent online from a moving bus. I am using ESP8266F modules to send the data. I am wondering what Arduino modules to buy that will act as an access point ...
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1answer
234 views

What SMS can send to switch LED?

I have code but I don't know how to send SMS from my Mobile I mean what the message I can send to switch the Led? To switch On or Off. I use SIm900 and use this code #include <SoftwareSerial.h> ...
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1answer
491 views

Software Serial and multiple shields for Arduino Uno

I have a SIM900 GPRS/GSM Shield (details here) and I am looking to stack a GPS shield (such as this one here). My question is: I believe that they both require software serial, also it says to use ...
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1answer
190 views

Printing the messages having problem in SIM 900A to Arduino

I have added my Arduino code for reading messages from GSM SIM900A using Arduino. But the output is showing something different. Please help me. #define SERIAL_BUFFER_SIZE 256 char msg; void setup()...
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1answer
63 views

Arduino sketch unexpected behaviour

I am currently in a arduino project to read some parameters from another microcontroller serially and the arduino is supposed to transmit these serially to dweet.io cloud. I use SIM900 modem for this. ...
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1answer
7k views

SIM808 module: GSM location command (AT+CIPGSMLOC=1,1) giving wrong value after execution of sending message command (AT+CMGS=+91xxxxxxxx)

I wrote the code that if an interrupt is generated, get GSM location and send a message. The first time the interrupt is generated, I got the correct GSM location using AT+CIPGSMLOC=1,1 and ...
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1answer
460 views

Telit GPRS Module never returning and never timing out for command AT#FTPOPEN

Howdie! I trying to run a GPRS modem on an Arduino. My full stack is Nimbelink's NL-SW-GPRS Modem (containing Telit GE910-QUAD GPRS module) with the Nimbelink Arduino Development Shield on an Arduino ...
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3answers
10k views

SIM808 module GSM working fine, GPS not working (No GPS ready message on power on)

I powered on my SIM808 module. It showed me following output: RDY +CFUN: 1 +CPIN: READY Call Ready SMS Ready It supposed to show GPS ready also. I sent AT command and return ok. However ...
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1answer
6k views

Which pins of an Arduino UNO can be used as Tx and Rx pins for connecting to GSM GPRS SIM 900A

I am using Arduino UNO and SIM 900A. Pins 0 and 1 are used as TX and RX. Is it possible to use any other pins?
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2answers
6k views

Arduino 4G LTE Shield

Is there by any chance a shield that can take an 4G LTE compatible SIM card activated by a carrier and establish a connection?
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2answers
1k views

Clearing arduino serial buffer

How to clear the serial buffer of arduino uno? This is my code to on and off the LED using sms from mobile using gsm module #include <SoftwareSerial.h> int Led=7; SoftwareSerial mySerial(9, 10)...
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5answers
14k views

How to send AT command to sim800l with SoftwareSerial

I have SIM800l module connected to Arduino and I'm trying to initialize it in my setup function with this code: #include <SoftwareSerial.h> //SIM800 TX is connected to Arduino D8 #define ...
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2answers
4k views

Arduino Mega + SIM808 GSM + GPS Module + Program Switch ON without pressing Push Button?

I am new to IOT and tried out integration and a small test code with an Arduino Mega + SIM808 + GSM + GPS Module. It works fine with the SIM808 Library. My requirement is to put it in an enclosure, ...
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1answer
66 views

message received from GSM contains parenthesis instead of curly braces

the GSM code i have been working out is up and running, I use JSON format in sending the data obtained by my sensors, but the JSON message I have been receiving contains parenthesis instead of curly ...
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2answers
2k views

GSM GPRS for sending an sms

I want to know if it is possible to send an SMS from a SIM900 using Arduinos to another SIM900. Problem: When the gsm is connected to the network, it does not send an sms; my airtime balance remains ...
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1answer
375 views

problem using GSM shield and GPS shield in one Arduino UNO R3

i try to program use the GSM shield Arduino with Arduino UNO i did it successfully but after that i try to use GPS shield but when i add the #include for the program i got the error #include <...
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2answers
342 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 efficient way to receive and send data to the cloud. The specific project I am looking to accomplish is starting my car from a web ...
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2answers
822 views

How to use web data from GSM Sim900 to be used as input for Arduino?

I have a GSM Sim900 connected to an Arduino Uno. I'm successfully able to use HTTP READ commands to show data from the web on the Arduino's serial monitor. It is showing complete HTML from that URL on ...
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2answers
808 views

How can I connect mysql with Arduino using GSMshield [closed]

How can I include mysql.h library in IDE of Arduino to connect Arduino to mysql database by using GSM shield?
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1answer
11k views

ARDUINO UNO+SIM808(GPS/GSM) SYNCHRONISATION

I started a project quite recently where I intend to combine the Arduino Uno and the sim808 module which has gps/gsm/gprs all together in one. The GPS functionality works fine. Just the GSM both ...
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1answer
2k views

Arduino to send sms one time only when a button is pressed

The LED_UPDATE() is called in my loop() function, I implemented it (tried anyways), to send sms as shown in the code such that only one sms is sent , because as the loop() keeps calling LED_UPDATE(), ...
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0answers
81 views

incoming GSM data stored as variable in code [closed]

I am using an Arduino Mega board with a SIM900 GSM. My goal is to be able to text the GSM with a value of two digits (ex: 79) and then store that value as a variable in the code. I know how to set ...
2
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0answers
829 views

GPRS/GSM SIM900 Shield not working with Arduino

I have a few questions related to GPRS/GSM SIM900 Shield not working with Arduino. To keep it short I have a list of concrete questions: Is the Arduino GSM library compatible with the Geeetech GPRS/...
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0answers
6k views

Arduino GSM receiving text and then storing value as a variable in code

I am using an Arduino Mega board with a SIM900 GSM. My goal is to be able to text the GSM with a value of two digits (ex: 79) and then store that value as a variable in the code. I know how to set ...