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Questions tagged [gsm]

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

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23 views

Arduino GSM Shield Firebase

I had a Firebase database application running with an Arduino ESP8266. I have to do this now with an Arduino GSM shield. Which GSM should I use? Is it possible to make a firebase connection with ...
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8 views

nRF24L01 and sim800L not working together

Good day, I would like to ask some help for my program code regarding the problem of nRF24L01 and sim800L. I have the code below #include <Sleep_n0m1.h> #include <Time.h> #include <...
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21 views

Partial output with reversed question marks when sending SMS with GSM900A module

I am using Arduino Uno along with GSM 900A Module to send SMS to my phone. This is the code #include <SoftwareSerial.h> SoftwareSerial mySerial(9, 10); void setup() { mySerial.begin(9600);...
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18 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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0answers
24 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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2answers
54 views

How to perform two tasks in one loop in Arduino?

I am trying to make a weather monitor using Arduino. I want my weather monitor to send me a message of the weather data every 5 hours using GSM sheild. Also, there is an LCD on my weather monitor ...
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1answer
58 views

I want to get incomming call number and compare it

Hello i want to get and compare incomming call number, it works but not as I want. When im calling from good number it print that I was calling form saved number when the number is stop calling i need ...
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1answer
26 views

Can't Interface SIM900a With Arduino Uno

I've got the following module of SIM900a. My connections are: VCC -> External 5 Volt 1.5 Amp Supply GND -> Common GND TX -> Arduino RX (Pin 0) RX -> Arduino TX (Pin 1) I hear a ring ...
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13 views

Arduino Uno Issue with SIM900 Network registration

I have a SIM900 module on which I have a T-Mobile Data Only SIM card (pin unlocked). I am powering on the SIM900 module using a power adapter which can supply voltages 4.5, 5, 6 7,5 and 9 V and 2.1A. ...
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0answers
18 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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61 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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24 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
47 views

SIMCOM SIM900 AT+QAUDCH=x; returns ERROR

For some reason, some commands return ERROR, like AT+QAUDCH=1 (headset). I tried unplugging the headphones and the mic and it didn't work. code: #include <SoftwareSerial.h> SoftwareSerial ...
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3answers
38 views

Code getting stuck waiting for GPS Output

I'm basically trying to make a device that pulls the GPS information from a SIM808 and pushes it to a server online via GPRS. I am sorry as I am not good at programming so ive spent days trying to ...
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1answer
34 views

My SIM800L isn't working in England. Alternative board for new EE/T-Mobile 3G PAYG SIM?

EDIT: I live in the UK, and I've read some articles just now that this module never worked after 2017 in the USA because it needs "a two frequency network"?, and support for 2G(phased out in America?)....
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1answer
115 views

Problem sending SMS from a GSM SIM900

I have a laser security system project with a GSM SIM900 and a few sensors. I'm using an Arduino Mega 2560, and everything is working normally, except the GSM is not sending an SMS to the phone and I ...
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1answer
59 views

Gsm Sim800l Module

I am using below code for send sms but SMS Sent sucessfully but save in SIM memory & not able to see message text : serialSIM800.write(“AT+CMGF=1\r”); //sending SMS in text mode delay(1000); ...
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32 views

Send and receive SMS's

I would like to send and receive SMS's with my Arduino project. I have an A6 SIM900A GSM module with me which is from Chinese. However, it does not work and does not accept any AT commands. So, I ...
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1answer
162 views

GMS send SMS text messages many times

The GSM sends many SMS text messages and does not stop. How to send only one SMS? This is my code: #include <SoftwareSerial.h> SoftwareSerial mySerial(9, 10); char msg; int vibr_pin = 7; void ...
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1answer
43 views

Not receiving the complete messange sent by SIM900

I need help with SIM900 and Arduino Mega. I do not receive the complete message that I send from my phone. (Arduino Mega _ SIM900 _ Alimentation 9V/2A) Message sent: 1234567891234567890 Message ...
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1answer
161 views

Unexpected result with the GSM module A6

I have a GSM A6 module, like this one. I'm going to use an Arduino Nano as a bridge to communicate with it, I have an external power source (since I read that this module can consume up to 2A at its ...
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2answers
473 views

how to make GPRS/GSM SIM900 shield work with gps neo-6M module using Arduino UNO board

I'm a beginer to arduino program.i will like to make a program that will send latitude and longitude on my mysql database.so since 3 days i try to learn how to use all this material(GPRS/GSM SIM900 ...
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1answer
253 views

How to configure TinySine 3G module (SIM5320E) for HTTP GET request

I recently bought a 'TinySine 3G shield (SIM5320E) 900/2100Mhz' based on Adafruit_FONA libraries to use with Arduino Mega 2560 R3. It successfully registered with Vodafone AU. Other functionality ...
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1answer
196 views

Data is not sending to Thingspeak using SIM900 with an interrupt in the code

I'm currently working in a weather station with online recording on Thingspeak. When I send a set of parameters (T, Pressure, Humidity, light), I don't have any problem with sending data. But when I ...
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1answer
31 views

Can I use GSM and Data Logger Shield at the same time on one Arduino?

Me and my classmates are trying to make an arduino base project where we will be using sensors, GSM, and Data logger shield. We want the arduino to store the data collected and at the same time send a ...
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1answer
259 views

POST request on Arduino MKR1400 GSM not working

Im trying to send a POST request from the Arduino MKR1400 GSM board to a server with a database. I've tested the server using Postman (https://www.getpostman.com/) and it handles the POST request ...
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1answer
90 views

Turning LED On/Off by using SIM808 with Arduino Mega

I am trying to turn an LED on/off by using GSM 808 module. Here #a0 = LED off and #a1 = LED on. I have used lcdShow function to display characters in LCD display. But nothing appears on display. What ...
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1answer
235 views

need help in code to send sms to multiple contacts using arduino, gsm800, push button [duplicate]

When button 1 is pressed, the message should be sent to 4 members. But we are receiving the message for one member and after some delay for the other members. But receiving to all members of contacts ...
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1answer
248 views

SIM800C, CPIN: NOT READY (ERROR CODE : +CME ERROR: 10)

I'm using a SIM800C module, and usually it works fine, but lately it has started giving the error "+CPIN: NOT READY" with ERROR CODE : +CME ERROR: 10(SIM NOT INSERTED). As soon as I get this message, ...
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1answer
117 views

a code problem for arduino GSM 1400 to send a SMS when tilt movment is detected using accelerometer [duplicate]

There is a mistake in the design implementation of the code probably in if statment - when using the serial monitor it repeatedly shows printf() statements from the code instead of "Sending SMS ...
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1answer
43 views

GSM cannot read SMS when Arduino is not reset for the first time after it is powered

I'm using a GSM Module with Arduino along with Node MCU. I have a supply of 9V, 2A in the DC jack of the Arduino and the GSM Shield. The Node MCU is powered from the 3.3V of the Arduino. I can receive ...
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1answer
942 views

LCD display weird characters

Im a newbie. I have a problem with displaying text in LCD (16x2). It shows incorrect message in the lcd. Here is the code and the picture that gives the wrong output : Kindly help Thank you. #include ...
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0answers
339 views

Arduino SIMCOM SIM 808 sim808 init error Occured

I bought following SIM 808 GSM/GPS/GPRS module for my GPS Vehicle tracking system. I tried following code but it shows "sim808 init error" in serial monitor. I am quite new to Arduino and this ...
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0answers
73 views

GSM module not responding while requesting to server

I am using a GSM GPRS module with Arduino and requesting to my server, but after 4-5 responses, the GSM module stops responding and stuck. It does not even respond to AT commands. Why isn't the GSM ...
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0answers
277 views

SIM800L Mini and Arduino Uno

I know there are a lot of threads about this, but i cant find answer for my problem. I have SIM800L Mini and arduino uno. I want to create basic SMS send application, but problem is with SIM800L. I ...
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0answers
146 views

Trying to send latitude longitude to SIM800L and NEO6MV2

I am trying to send latitude longitude to the number that I input. Please help. This is my code. #include <Time.h> #include <TimeLib.h> #include <TimeLib.h> #include <TinyGPS.h&...
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0answers
1k views

SIM800 GSM module with Arduino Uno + SoftwareSerial Library

I am trying to use SIM800 GSM Module with Arduino Uno. ARDUINO DIGITAL PIN 9 is connected to TX of GSM Module ARDUINO DIGITAL PIN 10 is connected to RX of GSM Module ARDUINO is powered by PC USB GSM ...
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1answer
69 views

Fail to retrieve the value from gsm sim 900A by using AT Command to PHP script

I am currently trying to establish a connection between my gsm sim900A to one of my test server. The connection seems pretty good so far, though I'm a little bit confused why there are no values ...
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1answer
284 views

Sending dynamic data to webserver

I am trying to send data to a php file via http GET method. I am able to send static data but I am unable to send dynamic data. #include <SoftwareSerial.h> SoftwareSerial gprsSerial(9, 10); ...
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1answer
434 views

SIM800L can't send SMS

I have a SIM800L module (green board). I used this to test my module. In that page, it use a SIM800L red board with a 3.7v LiPo battery. But I directly connected 5v from the Uno to the module. GND ...
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1answer
767 views

Arduino GSM Shield NET and STATUS led turn off after a few seconds

#include <GSM.h> // PIN Number #define PINNUMBER "" // initialize the library instance GSM gsmAccess; // include a 'true' parameter to enable debugging GSMScanner scannerNetworks; GSMModem ...
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1answer
144 views

GSM library_ all examples ar working except GPRS?

i am using arduino uno and sim808. i connected the sim808 to pins 2,3 on arduino uno and used GSM library. i tested all examples: make and receive a call or messages. the part of GPRS initialization ...
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1answer
338 views

Parsing Date/Time(GSM Module) [closed]

Can somebody show me another way of storing Date/Time from GSM Module? My current code gives me wrong data. Serial1.print("AT+CCLK?\r"); while (Serial1.available() > 0) { int Years = ...
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0answers
530 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
64 views

Uploaded program not executing

I have uploaded the following program to arduino uno but it wont't execute without connecting to the computer. My power source is a direct connection with usb to my charger. Sim module too is ...
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2answers
3k views

Need to convert char to string [closed]

I want to convert incoming_char to string. How do I do this? Then I should substring that string? #include <SoftwareSerial.h> SoftwareSerial SIM900(7, 8); //Variable to save incoming SMS ...
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0answers
50 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 ...
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0answers
27 views

GSM behaving weirdly

I have bought SIM900 and using putty I try to Configure the GSM modem but the GSM modem is behaving weirdly. I have Inserted Vodafone SIM but neither can I call the inserted Number nor I can call any ...
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1answer
2k views

Send SMS Arduino Uno + SIM900A shield

I am working on a module to send messages. I write the message on the serial monitor + phone number and I have to send the message to the line. Question: How to send messages through the SIM900A ...
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1answer
98 views

Connection Problems with GPRS Shield

I recently bought a GPRS shield from Seeed Studio but was having issues running the programs described in their documentation. Here is everything you need to know about my shield: Documentation for ...