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Questions tagged [gsm]

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

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7 views

SSL error on Sim900A [on hold]

I am trying to connect Arduino and Sim900A module to Google Cloud IOT, but when I try to enable SSL on Sim900A, It throws an error, which might mean that Sim900A does'not support SSL over HTTP. But ...
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0answers
44 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
25 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
21 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
28 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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0answers
65 views

Arduino Mega2560 + Sim808 + GPS + TCP HTTP GET

I'm trying to get some GPS data and temperature and send it over an HTTP GET request to a webserver (yeah I know, sending data over GET... no POST, it's boring). GPS is working, but TCP is not. ...
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1answer
34 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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0answers
29 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
61 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
42 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
61 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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0answers
27 views

MFRC522 stops working after SMS is received on GSM device

I have problem with my "probably" code. I am using ESP32, AiThinker A6, RFID I2C module. I use RFID library MFRC522 i2c. RFID works and accepts cards until SMS comes. I read antenna gain. Since start ...
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0answers
41 views

GSMSSLClient only works once

Via the GSM class I want to make a HTTPS request to my server from my arduino. For this I have wrapped some code into a class called Request wich looks like this: class Request{ public: String ...
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2answers
257 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
143 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
125 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
24 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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0answers
48 views

Seemingly free floating and too high voltages

I have connected a moisture sensor, a usual LDR, a BH1750 and 4 DS18B20 sensors to my Adruino MKR GSM 1400. A few days ago everything worked fine when mounting it to a breadboard. But now for some ...
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1answer
180 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
59 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
142 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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0answers
178 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
84 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
39 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
710 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
263 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
66 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
233 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
115 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
797 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
51 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
198 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
319 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
522 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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0answers
77 views

Problems using CCLK to send daily SMS

I am configuring a UNO with an LM35 temperature and a SAINSMART SIM900 in a GPRS only location. I want to get a report from it daily, or when "STATE" is received. I'm currently challenged by ...
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1answer
113 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
266 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
394 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
62 views

GSM Shield 2 Arduino Mega 2560

I have Arduino Mega 2560 and GSM Shield 2 M10. The shield has green + yellow + yellow slow flash, so I think that it has connection to the GSM net. There is an extra ground to the Mega They have dot ...
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0answers
63 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
2k 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
44 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
26 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
85 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 ...
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0answers
2k views

GET command with GPRS GSM A6 and arduino

I'm trying to get data from a text file(read.txt) in server by sending a HTTP GET request via AT commands for the GPRS GSM. Here is my code: void setup() { Serial.begin(115200); delay(...
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0answers
105 views

Arduino GPRS module is not connecting to the network

This is the GPRS module my group has (https://seeeddoc.github.io/GPRS_Shield_V2.0/) . We are currently trying to just send a simple text message through an arduino uno as a proof of concept then we ...
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1answer
256 views

Missing character when introducing delay in the code

I am using the following code for reading any incoming message, and doing something after decoding the incoming string. There is a delay of 10sec in the code. When this delay is not introduced in the ...
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0answers
57 views

Message content is incomplete SIM900a

I'm trying to capture the sender number and message content from an SMS and store it on the database, but the message content ends at around the 18th character. If anyone can offer a better way of ...
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2answers
658 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 ...