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Questions tagged [gsm]

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

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8 views

How to send text file using SIM800

I save my files using the SD Shield to my SD Card so I can send it via email. I use an Arduino UNO board, an SD shield and a 800c SIM. The email is sent as long as I do not attach a file, but when I ...
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16 views

SIM 800A error in output as i am unable to receive sms on mymentioned mobile number even after selecting the correct network

Actually my main project is gas leakage detection using arduino and gsm module but I am unable to receive the alert sms ..so I am trying only gsm module program first...plzz help OUTPUT:- AT+CMGF=1 ...
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11 views

SIM800L heating when connected with buck convertor

I am using 12V power supply from the adapter and converting it to 3.9V using this buck convertor to power this SIM Module. But surprisingly the sim module heat up and when disconnected VCC and GND ...
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1answer
20 views

SIM800L is not registering on network

I'm testing SIM800L module by registering to network manually and I'm getting an error message. Here are the commands I tried. AT+CSQ +CSQ: 31,0 OK AT+CBAND? +CBAND: EGSM_MODE,ALL_BAND OK AT+...
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1answer
18 views

SIM800L GSM module is not working

I'm testing SIM800L GSM module with Arduino UNO and module is blinking 3 times every 15 seconds or sometime every 45 seconds. Why this is happening? In serial monitor it shows Message Sent ...
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17 views

Receive Data On Arduino In Remote Location

My project is an Arduino with a sim card that's connected to a battery that acts as a switch however the Arduino's location is remote and I'm not sure if there is data coverage. The data I am sending ...
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21 views

Arduino UNO Restarts when HTTP API called with 500 Bytes response

String get_data() { String resData =""; char msgs[450]; numdata=inet.httpGET("myserver.com", 80, "/call.php?id=1&q=1&code=1001", msgs, 450); resData = parseMessage(msgs,numdata); ...
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15 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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37 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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1answer
22 views

Sim808 module HTTP Bad request

I have an Arduino UNO and sim808 EVB-V3.02.4. I want to send a GET request to my url but I always receive 400 Http bad request error. #include <DFRobot_sim808.h> #include <SoftwareSerial.h&...
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31 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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1answer
56 views

Sim800 FTP Arduino

I've been unable to FTP anything using an Arduino and SIM800L. I have reduced the code as far as possible: #include <SoftwareSerial.h> //Create software serial object to communicate with ...
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3answers
29 views

SIM800L HTTP request is not reliable

I have a question regarding SIM800L and HTTP GET request. I'm using this https://exploreembedded.com/wiki/Setting_up_GPRS_with_SIM800L simple code to communicate with SIM800l with AT commands. To ...
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1answer
27 views

Monitoring Power Down Using Arduino UNO and ZMPT101B

I am in the process of implementing power down alerting system suing Arduino UNO and ZMPT101B Single phase relay. My code as follows, #include <Filters.h> //Easy library to do the calculations ...
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27 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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34 views

Serial read with python: output missing

I'm trying to read SMS using GSM Shield 2 and Python, but I have a problem where I can't read the SMS content using pySerial while it works fine with the Serial Mac app. I do the same thing on both ...
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25 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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1answer
60 views

Arduino Communication with Sim 900

Im using an arduino uno and a sim 900, the simcard is setup and working as I can make a phone call to it and it rings. The sim 900 is powered via the power jack and the uno is currently powered using ...
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1answer
20 views

Wire SlaveReceiver : will the registered function in onRecieve interrupt/conflict with loop block?

I am currently researching on I2C, and I made a configuration that has MasterWriter that transmits data to a SlaveReceiver that will store the data received from Master, into an SD card, and then ...
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1answer
41 views

Is there a simple HTTP(S) library that doesn't rely on WiFi?

I'm trying to implement a Mobile Network (only) for the ESP32 using Arduino IDE. So to be able to connect to website up/download files etc. I need to be able to handle various HTTP PUT/GET/POST ...
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27 views

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
33 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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1answer
103 views

creating HTTP persistent connection, to create 'smooth' data over GSM sending

Project goals Send data over GSM to firebase Fast sampling - need to send 16 bytes every half second to firebase Send data using GET or POST to server with PHP script, that redirect data to firebase ...
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45 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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16 views

SMS text after lower case 'w' get lost in standard GSM library's SendSMS example [duplicate]

I am using an SIM 900A GSM module with arduino Uno and this program given in GSM library example https://www.arduino.cc/en/Tutorial/GSMExamplesSendSMS. But if there is lower case 'w' in sms text, then ...
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1answer
72 views

How Programing the nodeMCU Through OTA using GPRS?

How Programming the nodeMCU Through OTA using GPRS? Hi Everyone I need big help. Actually, I m using NodemCU one of my project. the setup in Remote location, that place dont have a wifi option so I ...
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27 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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115 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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9 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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1answer
43 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
60 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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1answer
274 views

Shield SIM808 EVB V3.2 charge a Lithium battery?

hello friends do you know if, can this shield (SIM808 EVB V3.2) charge a lithium battery directly or i need additional hardware?, I know that module has conection for battery but it can charge it?
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1answer
173 views

How I can connect module GSM SIM800L?

I bought a GSM module, and I want to connect it with Arduino but I have a problem. I linked GSM SIM800L with regular LM2596 12 V 2 VA I changed tension to 5 V, So far the GSM is ...
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136 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
164 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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1answer
37 views

SIM800l doesn't respond on arduino micro

I want my Arduino Micro to interact with my SIM 800 L module. But unfortunately nothing happens, may you can help me figure out where I made a mistake. Here's my wiring: Summary of my wiring: ...
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20 views

GSM SIM900A SMS

I used this code to send SMS and connected the Arduino's Rx to SIM module Tx and Arduino's Tx with SIM module Rx but SIM module does not send SMS. I also changed the baud rate to 2400 but it did not ...
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0answers
37 views

empty message receive

#include <GSMSim.h> #include <SoftwareSerial.h> #define RX 7 #define TX 8 #define RESET 13 #define BAUD 9600 GSMSim gsm(RX, TX, RESET); const int doorSensor= 2; int doorSensorState= 0; ...
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33 views

GSM and LCD functions don't work together

I'm trying to create a system that allows me to water my plants and turn on the LED strips through SMS. I'm also displaying data from the sensors on an LCD. Both of these things work separately. When ...
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1answer
53 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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42 views

SIM800L save message to draft in sim memory

I want to save some data in sim memory as draft message and later read it. I am Using Arduino DUE and SIM800L Basically my main target is to keep in check the total uptime(approximate, error of upto 2-...
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21 views

nRF24L01 and sim800L not working together

Good day, I would like to ask some help for my program code regarding the problem of nRF24L01 and sim800L. I have the code below #include <Sleep_n0m1.h> #include <Time.h> #include <...
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103 views

Partial output with reversed question marks when sending SMS with GSM900A module

I am using Arduino Uno along with GSM 900A Module to send SMS to my phone. This is the code #include <SoftwareSerial.h> SoftwareSerial mySerial(9, 10); void setup() { mySerial.begin(9600);...
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81 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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0answers
26 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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2answers
62 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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1answer
73 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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2answers
121 views

Can't Interface SIM900a With Arduino Uno

I've got the following module of SIM900a. My connections are: VCC -> External 5 Volt 1.5 Amp Supply GND -> Common GND TX -> Arduino RX (Pin 0) RX -> Arduino TX (Pin 1) I hear a ring ...
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0answers
63 views

Arduino Uno Issue with SIM900 Network registration

I have a SIM900 module on which I have a T-Mobile Data Only SIM card (pin unlocked). I am powering on the SIM900 module using a power adapter which can supply voltages 4.5, 5, 6 7,5 and 9 V and 2.1A. ...
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2answers
29 views

Servo starts to shake when I added SIM900.begin(19200);

Hello I'm working on this mini project. This project works this way, Whenever someone type wrong password, LCD will display "Access Denied" and send an alert to SMS using GSM module. I used 2 ...