Questions tagged [gsm]

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

125 questions with no upvoted or accepted answers
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905 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/...
3
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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 ...
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0answers
2k views

How to control relay using SIM800 and Arduino Mega through SMS?

For my project I need to control relays through SMS and now I can send SMS from my SIM800 module which is connected to Arduino Mega R3. But I tried several shapes for AT commands to receive SMS and ...
3
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790 views

how to detect the incoming message from sim800 GSM module

I am designing an motorcycle security system and I need to receive the message from the user.Hence i need to detect the incoming message and read the number and data from the message
3
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0answers
1k views

(Arduino + official GSM shield + ultrasonic HC-SR04 sensor) inaccurate measuring

I'm using an Arduino Uno, 1.0.5 r2 version of the IDE with and ultrasonic HC-SR04 sensor for measuring a tank water level. I want to send the data obtained over internet using the official arduino GSM ...
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0answers
40 views

How can i tell the power status of a GSM900

What I am after is a reliable way of telling whether the GSM900 shield is powered up or not. "Obviously" the shield power is the constant green light. But i'm talking about the red light on the ...
2
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0answers
2k views

Turn led on after ringing once, off after two rings when hung up SIM800

I'm trying to make something that has one led and a gsm module which is SIM800L, I'm using seeeduino GPRS library. What I'm trying to do is that when I call the GSM module and hung up after ringing ...
2
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0answers
294 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 ...
2
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0answers
6k views

Sending AT commands to a gprs shield using serial port

I have a GPRS shield connected to an arduino uno board, i want to use the shield to send sms and do phone calls, from a C# Wpf application, the arduino is connected to the application using the serial ...
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0answers
1k views

How do I use I2C from an Arduino Uno when I have a GSM shield mounted?

This may be an extremely obvious question but I don't seem able to find a definitive answer. I have an Arduino Uno and a Sim900 GPRS/GSM shield fitted on top of it. I had I2C working on the Arduino ...
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0answers
363 views

How can I open simultaneously 2 client socket connections with GSM shield?

How can I open simultaneously two socket connections with a GSM shield? It seems that when I try to open the second connection, it is not opened, and additionally the first connection is closed. ...
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1answer
9k 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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29 views

Send message to multiple number

sim.println("AT+CMGS=\"+91xxxxxxxxxx\"\r"); I don't want to write this. I want to write mobile number on serial monitor in Arduino and on that number, i want to send message. how ...
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18 views

Send data from GSM module to cloud server like firebase

I am trying to search for anything to send my sensor data from Arduino + GSM SIM900A to a cloud server, preferably firebase. Does anyone know how can I achieve this operation to firebase or any other ...
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20 views

GSM900A module is not connecting to the network

My GSM900A module is not connecting to the network. IT continuously blinks(1 sec). The power was given by the Arduino Uno board. Then I tried connecting an external battery(4.2V , 4200mAH). But it ...
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0answers
33 views

GSM900A module insert simcard

I connected the GSM with Arduino as stated, it responds to commands like AT+CFUN and some other than relating to sim card functionality, I have inserted a working sim card and still brings up CME ...
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0answers
8 views

which kind of data are store If i terminate the call in sim800?

I'm working in SIM800 for DTMF based project. I want to know which kind of data are stored in the buffer during termination of call in SIM800. How to find if call was disconnected in SIM800? Also ...
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246 views

Send data from arduino to server using GSM, TCP

My actual connection is like: Arduino -> GPRS(http)-> my server(php script)-> firebase <-android plotting app But it only allows to send some data once every 2 - 3 seconds (depending of ping to my ...
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12 views

Arduino GSM Implementation

I want to send sms to a number if and only if that number is in the radius of the arduino with GSM module. I already have GPS into it. Should i integrate a ultrasonic sensor to get the distance and ...
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0answers
280 views

Arduino Mega with SIM800L running Modbus TCP/IP

I'm trying to set up an Arduino Mega with a SIM800L module and trying to get Modbus TCP running on said Mega. I've set Modbus TCP over wifi and serial before but I used libraries for those. The ...
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146 views

How can I use my sim808 as Both GPS and GSM module for this code

#include<LiquidCrystal.h> LiquidCrystal lcd(7, 6, 5, 4, 3, 2); #include <SoftwareSerial.h> SoftwareSerial gps(10,11); // RX, TX //String str=""; char str[70]; String gpsString=""; char *...
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31 views

Not able to receive string from database

A few days ago I posted a thread as I was not being able to send data to my database online. It worked when I changed the GPS module. Now I am trying to retrieve data from the same Server and i'm not ...
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0answers
85 views

Interfacing TTP229 touch sensor with arduino and gsm module

I have been working on an Arduino based call and message project which I am following from this link https://circuitdigest.com/microcontroller-projects/call-and-message-using-arduino-sim900-gsm. This ...
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0answers
292 views

Nodemcu + GSM IOT-GA6

I've connected my NodeMCU to GSM module using GND, RX and TX. I use At Comand Tester. When I try to get sim status or something I get error for example: Unable to get Sim status. Only AT comand ...
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0answers
222 views

I want to connect my NodeMcu v3 to gsm

I have a problem with connecting my NodeMcu to gsm. I have bought GSM module but I have sim code on card which I can't and that is the problem because I've found some libraries but there are no ...
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0answers
1k views

How to store the content of message sent to GSM module (SIM900a) into a string?

I am Working on a project to control the system via the GSM messaging Scheme. eg:- If I send 1 via an SMS to the GSM module, the Arduino would read this message and disable or enable the system. But ...
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0answers
91 views

Servo position is always changing

When I send an SMS like this: Tilt:090 Azimuth:120 First time an SMS is read, the servo rotates to the correct position, but after they change a small angle, it's like noise. I do following things ...
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0answers
281 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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0answers
258 views

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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0answers
537 views

Sim900 data logging through Sparkfun

I've been trying to upload data to data. Sparkfun's servers using HTTP commands, but I've hit errors every time I try. This is my code: #include <String.h> void setup() { Serial1.begin(...
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160 views

Why After instancing TinyGPS , serial stop working?

I have GSM shield (and Arduino UNO) works fine with this code : #include <GPRS_Shield_Arduino.h> #include <SoftwareSerial.h> #include <Wire.h> #include <Suli.h> #define ...
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0answers
2k views

Sim800L HTTP post request stop working after a while

I am desperate to get my SIM800L module (http://www.ebay.co.uk/itm/SIM800L-GPRS-GSM-Module-Board-Quadband-QUAD-BAND-Antenna-for-MCU-Arduino-/321992759287) sending POST requests for a long period of ...
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0answers
139 views

SIM900A GSM/GPRS Shield Transaction per minute

I'm planning to buy SIM900A GSM/GPRS Shield for Arduino Uno. I wanted to create an application that sends SMS to a list of mobile numbers, let's say 1000 mobile numbers. Is it applicable to use ...
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0answers
268 views

Unable to read any SMS's other than the first SMS using SIM908 shield

I'm using two SIM908 shields to communicate with each other. One of the shields will be connected to a sensor and it should send values contentiously to the second SIM908 (receiver). I'm facing a ...
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0answers
509 views

SIM 900 stop after 1'5 hours; what's wrong?

I have a Gboard module (from Itead) configured to recieve data from Xbee sensors, and log data to a server DB on inet (via GPRS). This module is programmed with Arduino IDE. I turn on the module (...
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0answers
548 views

Make a GET Request GPRS

I'm building a weather station that sends the data to a webserver via GET request. I was wondering if you guys can look into my code and help me. I looked all over the internet and can't find what'...
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0answers
780 views

send SMS for 1 time with arduino GPRS SIM900 if an iput is HIGH (4 Digi inputs)

I faced a problem to send 1 SMS if an input is HIGH,and if it is LOW==> no SMS to send,if LOW to HIGH==> send 1 SMS. this code not working,just sent SMS when I turn the GPRS on,and after nothing is ...
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471 views

GSM shield for Arduino Due

Is there any good quality GSM shield compatible with Arduino Due? I have searched for gsm shield but it seems all shields have operation voltage 5v. Any suggestion would be helpful.
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0answers
388 views

Can I use an Arduino and GSM breakout board for triangulation?

IS there a way for me to use cell towers to triangulate my location with an Arduino Uno and GSM breakout board? if so how?
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0answers
296 views

How to forward sms using arduino uno + gsm shield

hey there I'm new to arduino. I'm working on a project that needs to send an sms to get a response and forward the response to another mobile. What is the easiest way to do so
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439 views

integration of GSM module and Bluetooth using arduino

Please help me. There is a conflict when I put GSM and Bluetooth module in one MCU. The problem is when I use the GSM, the Bluetooth will not respond and vice-versa.
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532 views

Arduino GSM Shield web server hangs

I use official Arduino GSM Shield with Uno R3. I uploaded web server examples from official GSM library. I use a simple python script to make TCP/IP connections to my GSM Shield web server. I send ...
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0answers
1k views

Change XBee shield TX/RX Software serial?

I am looking to have an Arduino UNO stack with a GSM Shield and an XBEE shield for wireless communication. However, since the GSM Shield requires digital pins 2 and 3, I would have to reroute the RX/...
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0answers
441 views

Garbled data output from sensor through XBEE?

I have a fio v3 + a 9DOF sensor hooked up to an XBEE. On another UNO board, I have a GSM shield and another XBEE board. The fiov3 is supposed to sample data from the sensor, send it through the xbee....
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218 views

GSM shield SIM card troubles

So I'm trying to use the GSM shield to communicate with my smart phone. The SIM card that came with the shield only works with other devices on that network, and it's an obscure latin network that I ...
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0answers
700 views

Can you interface GSM, WiFi, and Bluetooth LE shield to Arduino?

I have a project that requires the following three shields and I was wondering if the Arduino has enough space to interface all of them at the same time. I am thinking of connecting each shield into a ...
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0answers
495 views

SIM 900 + Arduino Mega attachGPRS problem, GPRS_READY

I have connected my GSM module to my Arduino. Using AT commands I am able to connect to internet. Using the following link of tutorials, I tried to connect to internet http://arduino.cc/en/Tutorial/...
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207 views

GPS - Speed doesn't update as should - EM408 & Arduino Mega & GSM

I'm developing a system that will get the GPS signal and send it though the GSM with information about position, speed and temperature from some digital sensors. Currently I'm using the GPS EM408, ...
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0answers
21 views

SIM900 module connects then disconnects from carrier soon after

I have an Arduino Mega 2560 with an ESP8266 built into it, and a SIM900 shield, which I am building a project with. The shield is powered by an external adjustable 3-12V, 2A supply set at 6V so power ...
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0answers
27 views

Help with reading and storing data from sim module

I'm using a sim800C module and an Arduino Uno. I want the code to send back an SMS to a number which sends it the password. So, if the sim module receives 'abcd' I want it to send back an SMS, saying '...