Questions tagged [gsm]

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

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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
3k 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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372 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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1answer
177 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
518 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
1k 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
2k 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
238 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
902 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
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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2answers
7k 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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83 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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1answer
3k 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
177 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
3k 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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1answer
718 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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2answers
1k 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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1answer
260 views

IR sensor not incrementing or decrementing inside the loop

My project is automatic room light controller with visitor counter using Arduino. My project was running correct upto this, but the problem started when we connected GSM module to our project because ...
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1answer
297 views

Why is GsmScanNetworks not working?

I'm using an Arduino UNO with an Arduino GSM Shield 2 with Integrated Antenna A000105. However, when I try to upload the code, in the serial monitor it tells me my IMEI is 0 and signal strength is 0 ...
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2answers
2k views

Problem in AT+CIPSEND(CTRL-Z) GPRS GMS A6

I am using GPRS GSM A6 with arduino uno to post data to web server. After sending AT commands to module I get OK response after every command, AT+CIPMUX=0 OK AT+CGATT=1 OK AT+CSTT="internet","","" ...
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1answer
10k views

Reading SMS using Arduino Uno and SIM800L and print on LCD (16x2 alphanumeric) using serial connection NEED HELP

Well, I am making a device, which has to receive SMS and print the text using am LCD display. Now I have code that can receive SMS and store it into a string variable using serial connection. Here is ...
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3answers
642 views

Make Arduino send and receive at the same time

I am working on a project where I connect a GPS module and GPRS SIM900 shield. The location will be sent when it recives a certain character. Now my question is, can the Arduino receive from GPRS and ...
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3answers
2k views

Arduino Nano and SIM800L on Battery Power

I'm very new to Arduino and everything related but I'm highly interested to learn more. However, I've run into a problem right in the beginning. I want to build some sort of portable emergency/...
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1answer
596 views

Can't get call / message from A7 gsm+gprs+gps module

I am making a project using arduino uno & A7 gsm+gps+gprs module.my circuit connection is like this: A7 UTXD -> arduino RX A7 RTXD -> arduino TX A7 GND -> arduino GND A7 pwr_key -> A7 ...
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2answers
11k views

SIM800L not registering to network

I am using SIM800L module. I am new to GSM modules. I have searched in many web sites about SIM800L, every where they mentioned baud rate 9600 for SoftwareSerial but it is not working at all in my ...
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2answers
2k views

Arduino GSM module + SMS string sending garbage value

I want to check the water level and have an SMS sent via a GSM module. Reed switches are connected to four Arduino analog inputs. I am unable to add a string and tank level (TKLVL) in program. The ...
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0answers
20 views

Unable to receive and print sms on serial monitor arduino uno and SIM900A [duplicate]

I'm trying to receive sms and show it on serial monitor. My code is as follows: void setup() { Serial.begin(2400); Serial.write("AT+CMGF=1\r"); //set GSM to text mode delay(1500); Serial.write(...
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3answers
3k views

Unable to receive and print SMS on the serial monitor with Arduino Uno and SIM900A

I'm trying to receive an SMS and show it on the serial monitor. My code is as following: void setup() { Serial.begin(2400); Serial.write("AT+CMGF=1\r"); //set GSM to text mode ...
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2answers
736 views

AI A7 Thinker connection with Arduino

I am trying to connect my A7 to my Arduino Uno but I can't find a way to communicate with it. I searched a lot on the internet to find some schemes but not one of them worked. Here is my actual setup: ...
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0answers
38 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 ...
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1answer
603 views

Why do GPS coordinates fail to save on MySQL database using SIM900?

My project is a vehicle tracking system. I'm using a NEO-6M for GPS and a SIM900 for GPRS. I want to send the GPS coordinates to a MySQL database. I've tested the GPS and it's working well. I've ...
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1answer
599 views

Posting data to ASP web service from GSM using AT commands - where am I going wrong

I'm using an Arduino uno with a SIM900 GSM shield. I'm trying to connect the Arduino to my (ASP MVC) website. I've written an API which i've successfully tested with postman, and whilst the GET ...
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1answer
1k views

ERROR on SIM900AT comand HTTPDATA (POST method)

Good day community, I have a project which is VEHICLE GPS Tracker and I'm using Arduino Mega, NEO GPS6MV2 and SIM900. I'm using SIM900 to send the GPS coordinates on a web server. I'm using the POST ...
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1answer
1k views

AT command to put the A6 GSM/GPRS into sleep / power down

The general AT command for sleep mode (for the SIMCOM GSM modules) is AT+CSCLK=1 (or AT+CSCLK=2). I have given both a shot but they don't work with the A6 module. Does anyone know of any other command ...
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1answer
450 views

SIM900A showing Starting modem test…ERROR, no modem answer. Checking IMEI…Modem's IMEI: 0 [duplicate]

Edit: Solution can be found HERE I am trying to interface Simcom SIM900A GSM (SIM900a Mini DEV Board v3.9.2) and I tryed interfacing it with Arduino UNO. I have connected as: Pins: SIM900A - Arduino =...
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2answers
7k views

How to jump outside the loop? in below Programme how to use goto or any other Jump related Programme

const int analogPin1 = A1; const int analogPin2 = A2; const int analogPin3 = A3; const int ledPin = 13; const int ledPin2 = 7; const int thresold = 400; unsigned int x1, x2, x3, fault = 0; void setup()...
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1answer
4k views

Sim800l gsm module cannot connect gprs data

I am a rookie to arduino. I am trying to access MQTT server using Sim800l coreboard GSM module with Adafruit Fona/Tinygsm library but failed.So I decided to check http GET/POST request with AT command ...
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2answers
1k views

Receive an array of characters using SIM900 module

I tried to receive an array of characters using SIM900, but I couldn't. I can receive just one character like 'G', but I want to receive a string "abcd". When I used char* to save the SMS, I failed. ...
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1answer
394 views

Home devices control system using gsm and arduino mega2560

Hi dears I'm trying to do project to control app base gsm control by arduino mega 2560 gsm module SIM900A To send SMS to open Led than reply SMS to give as the status I mean send SMS then I received ...
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1answer
201 views

Problem with Arduino Uno and SIM900 shield logical communication (rx & tx)

The logical communication(rx & tx) between the shield and Arduino Uno doesn't work. Arduino (rx & tx) supply is 0 & 5 V but this is 0 & 2.8 V. What am I to do?
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2answers
11k views

SIM900a Mini Modem, IMEI 0, help with TX RX pins

I have Simcom SIM900a GSM (SIM900a Mini DEV Board v3.9.2) and I am interfacing it with Arduino UNO. I have no idea how to connect SIM900a to Arduino UNO. What I did now is: I connect the following ...
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1answer
1k views

Send HTTP get request from GSM SIM800c and Arduino

I am trying to send Get request from my GSM Module but after connecting to server it is not responding any thing #include <SoftwareSerial.h> SoftwareSerial myGsm(2,3); void setup() { myGsm....
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2answers
1k views

SIM800L and Arduino Sleep - getting whimsy Serial output after 5 calls

i'm working on project where i'm trying to achieve that arduino parse caller ID so i can use it later to send SMS with sensor reading data. Somehow i made that code (with much googling) and it works ...
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1answer
160 views

Program NOT responding to loop()- Arduino UNO+GSM + Sensor

I'm trying to monitor the sensor values (range 0-1000) connected to Arduino UNO's 12th-pin. If the value stays below say 500, then it should SEND SMS. I tested the sensor and GSM shield seperately and ...
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1answer
2k views

Sending POST request to HTTPS aws server using SIM900A

I have hooked up an SIM900A module to my Arduino UNO and I wanted to send a GET request to my aws server for which I have created a RESTful API, the problem is that when I send a request using AT ...
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1answer
5k views

Arduino: Connect UNO to A7 AI Thinker

I just cannot connect or send AT command from my UNO to A7 AI Thinker module. This is the connection: UNO -> A7 TX -> RX RX -> TX USB || 5V -> External Power ...
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1answer
257 views

Why is the GSM shield so expensive? [closed]

I've been doing some Googling for GSM shields and their prices and frankly I don't understand why they are so expensive on average. The official one sold by Arduino is 71 euros for me (I live in ...
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1answer
277 views

GPS Logger Error

I have created a GPS logger code using DFRobot SIM808 library. The tcp code and getGPS codes are working fine. but when integrating the both the code, it failed to upload GPS data to thingspeak. It ...
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1answer
3k views

How to extract latitude and longitude from GPS

I want to extract longitude and latitude from GSM/GPS module and then upload it to thingspeak. I am using sim808 GSM/GPS module and AT+CGPSINF=0 to get GPS location information sentence (CGPSINF: 0,6....
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1answer
468 views

Arduino Mega 2560 with SIM808 module - Incomplete SMS response

I have this code to read a SMS: String read_SMS(int index) { Serial.println("--START READ SMS POSITION" + String(index) + "--"); delay(400); sendATcommand("AT+CMGF=1", "OK", 1000); // sets ...

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