Questions tagged [gsm]

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

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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
18 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
698 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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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
458 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
516 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
400 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 - ...
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2answers
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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
3k 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
348 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
197 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
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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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0answers
878 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
939 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
141 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
230 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
232 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
2k 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
401 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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1answer
2k views

Arduino Mega 2560 with SIM808 module

I have a SIM808 module like this: https://www.banggood.com/SIM808-Module-GPS-GSM-GPRS-Quad-band-Development-Board-For-Arduino-p-1063106.html The output header has 5 pins: GND/RX/GND/TX/VCC and I ...
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1answer
121 views

Compatibility between shields

Despite that I am new to Arduino, I am tasked to invent a serious alarm system and I chose Arduino. I study electronics, but virtually I am a software programmer and C is my area of expertise. I ...
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1answer
1k views

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
1k 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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1answer
661 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
216 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
379 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
384 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
405 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
771 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 ...
3
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1answer
666 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
9k 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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1answer
751 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
707 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
3k views

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
689 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
100 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
717 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
1k 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
248 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
391 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
228 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 ...