Questions tagged [gsm]

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

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I'm able to send messages from SIM800a module and receive “+CMGS: 177 Ok” but I'm not able to receive it in the number entered in the code

#include <SoftwareSerial.h> SoftwareSerial mySerial(10, 11); char msg; char call; void setup() { mySerial.begin(9600); // Setting the baud rate of GSM Module Serial.begin(9600); // ...
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25 views

Sending AT Command for sms to arduinoShield

i have a Arduino GSMShield and I want to send SMS. When the module try to connecting to the network, it print AT+CREG? Dont know why cause there's no serial.println for this int8_t answer; int ...
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41 views

Program is executing but AT commands not showing in serial monitor

My purpose was to send SMS using GSM SIM800L coreboard and Arduino UNO. Here is the code #include <SoftwareSerial.h> //Create a software serial object to communicate with SIM800L ...
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120 views

sim800l gsm module reboot command

i have a project to control a relay by sms and call by arduino and sim800L gsm modem and i need to modify the code below to by adding command to reboot or reset the modem ever hour i mean delete all ...
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68 views

SIM900A network connection

I can't connect to the network. Hardware used: Arduino UNO and SIM900A GSM module Tutorial used: https://www.instructables.com/id/GSM-SIM900A-With-Arduino/ Sim card used: Orange (I set it on 2G ...
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114 views

Problem sending GPS coordinates with SMS when requested

I have made a project that sends GPS coordinate but the problem is, when GPRS sends coordinates as 00.0000,00.000. So, I want to know if my code is wrong. Thank you for your answer. #include <...
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112 views

Receive SMS using Arduino Nano and Quectel EC25

I'm trying to use an Arduino Nano to communicate with a Quectel EC25 module from this Raspberry Pi 4G HAT. I'm using Arduino's pins 8 and 7 to communicate with RX and TX from the Quectel module. I'm ...
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31 views

Sim900b(chinese sim900a) AT+HTTPACTION=(0/1)reboots the module

I am trying to make an HTTP request in two ways Connecting sim900 to pc using TTL converter (without external power, only USB power) Connecting sim900 using Arduino nano (tried with and without ...
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51 views

Using SMS to receive password, then to choose whether to turn the relay on or off

I'm trying to use SMS messages to turn a relay on/off but before doing that i need to have a password system before allowing the user to turn the relay on/off. Basically, you have to send the password ...
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57 views

How to send sms message on specific area using Longitude and Latitude

Good day everyone! what code should i used for sending sms message depends on the area. the things that i used in my protoype i have MPU6050 accelometer, SIM800C GSM MODULE, NEO6MV2 GPS MODULE. So the ...
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100 views

Using SMS to send commands to the Arduino. Having problems in data parsing

I'm still inexperienced in programming and i apologize in advance if my mistakes are stupidly obvious. This sketch I'm working on is a basic GSM project using SIM900a Mini and an Arduino UNO that ...
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303 views

SIM868 AT+CIPGSMLOC returns latitude and longitude location as 0.000000

I am unable to get any location data from SIM868 module using the command AT+CIPGSMLOC=1,1 It returns 0.000000,0.000000,2019/12/23,08:50:39 I have internet enabled using AT+SAPBR=1,1 command. ...
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157 views

SIM900 module not reading Sim Card

I am using GPRS Shield for Arduino Uno with SIM900 module on it. I am able to communicate with the module just fine (using AT commands), but whenever I try to use a command which involves sim card (...
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59 views

can't interface SIM900 GSM Module with Arduino Mega

I am trying to interface SIM900 GSM Module with Arduino Mega. When I send AT command on COM port in carriage mode then its not sending 'ok' back so I think the interface is not successful. Here is the ...
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123 views

Nodemcu & GSM module & CLIP problem (CLIP line not always appears on the serial connection)

I'm working on phone-controlled car park gate. Trusted employees numbers are saved on SIM card/hard coded in program. So the idea is, if a trusted person calls the "gate number" ; Nodemcu will ...
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25 views

Checking Specific Brand SIM card Type Available in GSM module

Can I program a GSM module to accept a specific type of Sim card to be ready by the module? If so please post something that can give me an Idea of how do it. Generally I want to lock the GSM module ...
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19 views

How to extend gsm buffer?

Haii All, I am using gsm SIM900A module with arduino uno. I am trying to send some data from that to server. When i am writing some commands for that, let's say i have written 3 commands before. But ...
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252 views

Arduino Uno + Sim808 GPS dont work with GSM

I am trying to get GPS data and pass it through GSM (Http Get Request). The GPS codes part works fine alone, also HTTPRequest part lonely. But when i use them together , the module don't get GPS data ...
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92 views

Arduino malfunction tmrpcm while used digitalRead

I am programming Arduino UNO for this functionality: with use of SD card reader module and SIM900 GSM/GPRS shield I am trying to: 1. Pick up incomming call, play message from SD file and after the ...
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40 views

HTTP request is not being executed in Arduino script for sending sensor data to Thingspeak cloud

I am trying to send the data from DHT sensor (temperature and humidity on 2 channels of Thingspeak cloud server) and firstly display them on Thingspeak cloud. Afterwards I will need to get those data ...
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235 views

How can I set the SIM900a to Europe?

I got a chinese SIM900a module but it can't connect to the network (I live in Europe). Is there a way to get it work on Europe mobile networks?
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310 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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13 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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313 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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153 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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93 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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306 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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223 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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1answer
954 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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393 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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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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98 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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2answers
2k views

GSM and GPS module don't work together

I am trying to create a project which involves getting latitude and longitude via GPS Module and send it via GSM Module. My problem here is that individual code is working perfectly. However, if am to ...
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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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286 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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265 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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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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242 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

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
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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86 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 ...
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547 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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2answers
4k views

DB:NO RESP Using inet.httpPOST on loop()

I'm using SIM900 module + arduino uno + gsmlib.org library. I'd like to send a string to endpoint on my API , and it worked correctly for the first time when I using inet.httpPOST function in setup(),...
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162 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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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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140 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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323 views

How to send latitude and longitude as text message on mobile? [closed]

I want to check speed at certain time interval, if speed is greater than certain (speed) value then send latitude and longitude as text message
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274 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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1answer
741 views

Problem in SIM900 GPRS connection

I make simple code to read web page by ITEAD Gboard. Here is my code: Serial.write("\nStarting..........\n"); mySerial.print("AT+CSQ"); delay(1000); while(mySerial.available()!=0) Serial....

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