Questions tagged [gsm]

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

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SIM800 Serial Communication Result Not As Expected

SIM800 module and a standard Arduino, I have a function to communicate by software serial with the module: String SIM800_send(String Incomming){ SoftwareSerial SIM800(SIM800_TX_PIN,...
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1answer
43 views

Split serial monitor output to only save part of the output

This is the output i get from the serial monitor from using a HM10 in . How could i go about splitting the data using arduino uno. I only want to save the last 12 digits before the :- (4CAA0DE091B7) ...
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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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3answers
20k views

SMS Receiving problem - Arduino Uno and SIM900A GSM Module

My intention is to control an LED according to the content of the SMS received. For example, if the SMS is "ON", turn on the LED and if it is "OFF", turn it off. I referred many sites and got the ...
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209 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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2answers
4k views

Arduino Mega + SIM808 GSM + GPS Module + Program Switch ON without pressing Push Button?

I am new to IOT and tried out integration and a small test code with an Arduino Mega + SIM808 + GSM + GPS Module. It works fine with the SIM808 Library. My requirement is to put it in an enclosure, ...
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1k views

(Arduino + official GSM shield + ultrasonic HC-SR04 sensor) inaccurate measuring

I'm using an Arduino Uno, 1.0.5 r2 version of the IDE with and ultrasonic HC-SR04 sensor for measuring a tank water level. I want to send the data obtained over internet using the official arduino GSM ...
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29 views

Exchange data between Arduino and a remote server

I want to read name and user code stored in a magnetic card by using my arduino and then send this information to a remote server. The server runs an application which is able to control if the user ...
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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
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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238 views

Arduino MKR GSM 1400 - inaccurate location (latitude/longitude)

Situation/Context: a) I'm using MKR GSM 1400 b) In an urban area in the US with good network coverage. c) As SIM card I tested both Twilio and Hologram. d) As antenna I am using this one https://...
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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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1answer
3k views

SIM800L GSM Module, no network signal RSSI

I am using a GSM 800L module to send SMS messages. When I test the module with Arduino, it shows a 0 : -115dbm signal strength. So basically there is no signal. SIM800L is a quad-band GSM/GPRS module ...
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69 views

Conditions with GSM module SIM900 doesn't execute

I'm executing this code to control a LED with GSM SIM900 message but there are two problems. First, it receives messages sometimes and some times doesn't. The second is that it doesn't execute the if ...
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1answer
186 views

Problem with String& argument of a function

I am trying to send SMSs using a GSM module with Arduino Mega. I have followed a tutorial and downloaded the SIM908IDE100 library. I am using the function SendSMS(String&, const char [27]);. It ...
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255 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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1answer
370 views

Send big amouts of data to PHP script via gsm module SIM800L

I'm looking for a way to get lots of sensory data from my Arduino Micro to a PHP script. My current attempt is using the following AT-commands: Sent: [AT+HTTPPARA=URL,www.example.com/newData.php?data=...
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103 views

Arduino and SIM900 unavailable all the time

I have the a problem with my arduino MEGA 2560 and the SIM900 module. I want to save the outputs of the AT commands, but I never get a chance. If I print mySerial.available() I only get 0. Sending SMS ...
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13k views

Is the SIM900 3G? Or is the SIM900A able to connect to 3G?

I would like to state that I am not familiar with the whole cellular connection thing. But I was wondering if the SIM900/or/SIM900A is 3G and will work with PTel Mobile. I need this Arduino to be ...
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1answer
7k views

Which pins of an Arduino UNO can be used as Tx and Rx pins for connecting to GSM GPRS SIM 900A

I am using Arduino UNO and SIM 900A. Pins 0 and 1 are used as TX and RX. Is it possible to use any other pins?
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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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129 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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4answers
6k views

SIM900 AT command HTTP GET request not show the web page

I build a simple HTTP GET request by SIM900. Here is it: -----1----- AT+CSQ +CSQ: 25,0 OK -----2----- AT+CGATT? +CGATT: 1 OK -----3----- AT+SAPBR=3,1,"CONTYPE","GPRS" OK -----4----- AT+SAPBR=...
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2answers
74 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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27 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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1answer
86 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
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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81 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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280 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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210 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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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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1answer
798 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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2answers
385 views

What is more power efficient: GPRS or SMS for a GSM sim Arduino application?

I have a GSM shield for my arduino and am wondering the most efficient way to receive and send data to the cloud. The specific project I am looking to accomplish is starting my car from a web ...
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1answer
2k 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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2answers
1k views

SIM800L module just repeating data sent via serial

I've got a Teensy 2.0 with simple AltSoftSerial as displayed on image: As you can see, when I send a command (or any other input via serial) the SIM800L module sends me the same input. I tried to ...
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0answers
39 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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3answers
622 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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1answer
48 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
613 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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3answers
11k views

SIM808 module GSM working fine, GPS not working (No GPS ready message on power on)

I powered on my SIM808 module. It showed me following output: RDY +CFUN: 1 +CPIN: READY Call Ready SMS Ready It supposed to show GPS ready also. I sent AT command and return ok. However ...
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1answer
821 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
176 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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1answer
4k views

GPRS SIM900 and GPS NEO-6M don't work together

I'm trying to get GPS coordinates and send them to my API through the GPRS SIM900 and GPS NEO-6M shields. In setup(), I first start the GPRS shield and call the function that connects to the internet....
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1answer
14k views

How to check if a GSM module is working or not?

I wanted to know if my GSM sim800 is working or not. A mishap occured while I was experimenting around with my GSM module and I arduino uno. The link to the module which I bought: http://www.ebay.in/...
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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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1answer
254 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
797 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
768 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
746 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
132 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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