Questions tagged [gsm]

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

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GSM SIM900A SMS content not displaying

I am trying to read messages sent from my mobile to a GSM SIM900A module on my Arduino Serial monitor. Neither does the AT+CMGR command nor does the AT+CMGL command display SMS content. I also tried ...
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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 ...
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1answer
4k views

How to recieve NMEA data in A7 Gprs/Gsm/GPS Module

This module is special, it has two UART ports, Rx/Tx to send AT commands and another TX GPS. If I send the commands: enter code here AT+GPS=1 // OPEN GPS AT+GPSRD=1// RECIEVER GPS NMEA DATA The ...
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756 views

Problem with SIM800L GSM module and servo

I have a SIM800L GSM module like in this link, . . The problem is when I connect the GSM to my Arduino Uno the GSM turns on for a while and then turns off. I tried to connect it with a 9-volt ...
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1answer
241 views

Design vehicle tracking device

I want to create an Arduino based vehicle tracking device which will be moved into a production board without Arduino later. Right now I have a few questions: What GPS module should I use for a best ...
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1answer
1k views

Cannot locate Rx Tx pins on SIM800a GSM module

I recently bought a SIM800a GSM module in India and I am unable to find the Rx Tx pins of the module to make calls using a Arduino duimilanove. The main problem is also that I can't find the data ...
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4answers
459 views

how to get precise value from float variable?

#include <NeoSWSerial.h> //#include <SoftwareSerial.h> #include <AltSoftSerial.h> #include <NMEAGPS.h> NeoSWSerial GSM(2, 3); // RX, TX: Connect TXD to RX & RXD to TX ...
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1answer
569 views

I want to obtain the output of GPS at every 5 secs and store them onto database using Arduino uno,GPS SKG 13BL and GSM module??

I am on a project,in which I need to store the output of GPS from SKG 13BL to a database using Arduino UNO and GSM module.I wrote the following code #include <SoftwareSerial.h> #include <...
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1answer
3k views

Sim800l and arduino pro mini3.3 volt

I want to connect sim800l module with arduino pro mini, I don't find any circuit diagram or tutorial for this. I want a circuit diagram for this.
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1answer
445 views

Arduino sim900a GPRS POST method asp.net [closed]

Post method is run perfect using postman. error while post the data on server using arduino sim900a module gprs. Arduino code mySerial.println("AT+CGATT?"); delay(100); ShowSerialData(); ...
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1answer
812 views

SIM800L Arduino Pro Mini

I am trying to send an SMS using the Sim800L module and it seems to be unable to connect to the network. When I send the AT+COPS=? command it shows me a list of all the available networks along with ...
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1answer
742 views

Using AA batteries to power Arduino and GPS unit

I'm more of a software guy, so I need your help to figure out the power issue with my Arduino. What I would like to do is using a GSM/GPS unit (Ai-Thinker A7) with Arduino Nano as a car tracking ...
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2answers
11k views

How to send messages to multiple numbers using Arduino uno & SIM800 module?

I am using following code to send message using Arduino Uno & SIM800 module. But I need to send same message on multiple numbers then what changes should I make in my code. const int buttonPin = ...
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2answers
933 views

Error while updating ThingSpeak using SIM808

im trying to update ThingSpeak from a SIM808 but I'm getting a network error. Please check below and let me know if there is anything wrong in my methodology. I'm using terminal.exe to send commands ...
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2answers
793 views

Errors when compiling the GSM SMS receive example from the Arduino IDE

I want to receive SMS and check whether the character is 'y' or 'n'. If it is 'y', set a pin to high so that a light glows. I thought I could use the example code given in the Arduino IDE for ...
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3answers
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GSM 900A modem not responding to AT commands

I am using GSM 900A modem which requires 5V Supply. I am connecting it to Arduino UNO. I am giving supply to modem by arduino 5V and GND pin. I am connecting RXD pin to TX(pin 1) of arduino TXD pin to ...
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1answer
809 views

Unable to receive SMS on Android

I have a GSM/GPRS shield for Arduino. It uses a SIM800 from SIMCOM. I've done several projects using it. Previously I used to send SMS from the same module. which were delivered appropriately. Since ...
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1answer
111 views

door protector arduino program

Please check the arduino program given below and help me to find out error. The program is for following hardware. GSM 800 module Arduino Uno board Limit switch(2) We place two limit switch at main ...
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1answer
865 views

How to communicate with GPS SIM900a without Serial Monitor

I am fairly new to Arduino. I was working on a project where I use a GSM SIM900a modem interfaced with an Arduino. The AT commands are sent via the Arduino to the GSM Modem. The problem, however, is ...
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2answers
2k views

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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0answers
277 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
429 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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0answers
249 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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2answers
2k views

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
2k views

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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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
2k 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
3k 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
911 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
1k 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
156 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
232 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 ...
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0answers
288 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
818 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
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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1answer
807 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
356 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
1k 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
745 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
356 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
1k views

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
19k 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
1k views

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
240 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
534 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
194 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
66 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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