Questions tagged [gsm]

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

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SIM800L is unresponsive to AT commands

SIMM800L connected to Arduino UNO doesn't respond to AT command. The serial monitor stops at "initializing..." the LED blinks every 3 seconds VDD --> connected to 5v of the Arduino uno ...
0 votes
0 answers
35 views

Problem in serial communication between ESP32 and GSM A7670C

I am using A7670C GSM breakout board with an ESP32. Connections RX-TX TX-RX GND-GND I am giving external power to the GSM module, 3.8 V according to theproduct description. When I sent the AT ...
1 vote
3 answers
3k 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","","" ...
0 votes
1 answer
143 views

How to check if the MQTT connection is still active?

I am wondering if there is a way to check and see if the MQTT connection is still active. The reason for this is that I am having trouble with the connection dropping after a short while and not ...
0 votes
1 answer
347 views

What GSM module I should use for HttpClient, ArduinoHttpClient, WebSockets etc.?

I need to use some API in my project. So I'm gonna use such libraries as listed in the title? What GSM/SIM module do I need for this purpose? I've checked 800L and similar - it only can use plain http,...
1 vote
1 answer
717 views

ArduinoHTTPClient POST multipart/form-data from SD card returning 400 Bad Request

I have been having trouble trying to send a small txt file to my server using the following function with TinyGSM. I know I am connected to the internet and reaching the web server, however, I keep ...
1 vote
1 answer
136 views

Powering a NodeMCU as well as a GSM module

I'm trying to connect a GSM module(sim800L) with a NodeMCU to execute remote operations. But the GSM module cannot be powered using the NodeMCU. So, what are the other ways to power the board as well ...
0 votes
1 answer
226 views

sim800l gsm module response isn't completed

I am using the sim800l gsm module with nodemcu esp8266 and comunicating with it using AT+ commands. The module is working correctly but I am trying to use the command AT+CLCC to get all the current ...
3 votes
0 answers
194 views

Sim800l doesn't respond to AT commands

My SIM800L doesn't respond to AT commands. The serial monitor is simply blank. And the led blinks every 3 seconds which means it is connected to a network I power it through an LM2596 buck down ...
1 vote
2 answers
2k views

SIM800L - AT Commands not doing anything on Arduino Serial Monitor

I am trying to send AT commands to SIM800L through Arduino's Serial Monitor. However when I type any command in the serial monitor nothing happens. I'm using an Arduino MEGA 2560 and the TX/RX of the ...
1 vote
0 answers
113 views

Arduino Uno not interfacing with GSM SIM900A Module

I am using an Arduino Uno with a SIM900A module. I want to send a simple SMS but it is not working, as it either has no response in Serial monitor or there are reversed question marks. I have attached ...
1 vote
0 answers
156 views

How to Send GPS Data to Firebase via SIM808 GSM Module

I have an Arduino UNO with SIM808 and I'm trying to send my GPS data to the Firebase. I have successfully get a location from SIM808 via serial. However I found that Arduino only supported HTTP ...
1 vote
1 answer
3k views

SIM A9G: +CME ERROR: 53 failure

I'm using a SIM A9G. When I send HTTP GET command from the serial monitor, it responds. But, it doesn't work when included in the code. #include <SoftwareSerial.h> SoftwareSerial myserial(8, 7);...
1 vote
0 answers
2k views

SIM800L not responding to AT commands

I am using SIM800L module the module. I am new to GSM modules, so I've searched for the basic to use the GSM with the Arduino. this is my code. #include <SoftwareSerial.h> SoftwareSerial ...
-1 votes
1 answer
707 views

SendSMS example sketch hangs at PINMUNBER if statement

I'm using an Arduino shield connected to an Arduino Uno for sending text messages. I'm using one of the in built examples from the Arduino IDE for sending SMS by name - sendsms in the GSM examples. ...
2 votes
0 answers
473 views

Can't Send Text Messages Using TinyGSM Module, but it works if I do it manually using the ESP-IDF Environment - Sim7600

I am using the following device: https://www.aliexpress.com/item/1005003152097545.html?spm=a2g0o.order_list.order_list_main.119.222218028PapM6 I am trying to make an IoT sound-measurer which will send ...
1 vote
1 answer
146 views

How to increase the frequency of data transmission of SIM900A GSM Module connected to Arduino Uno? [closed]

I have a SIM900A GSM Module hooked onto an Arduino Uno board. The Arduino is connected to a MPU6050 Accelerometer which is constantly monitoring data at 1 second interval. I am trying to transmit the ...
0 votes
1 answer
747 views

Is is possible to hook up an SD card and a GSM/GSRM module?

Is it possible to hook up a GSM/GSRM module AND an SD card at the same time to an Arduino Uno, or any Arduino? I want to build a cellphone to read off the buttons that are being dialed into it for a ...
3 votes
1 answer
12k views

Sim900 error on AT command AT+HTTPINIT

I want to send data to my php server using sim900 module but I am unable to initialize http service on sim900. code: #include <SoftwareSerial.h> SoftwareSerial gprsSerial(8, 9); void setup() {...
-1 votes
1 answer
400 views

How to send a group message to multiple receivers using GSM900 and Arduino Mega2560?

I'm working on a project and it can send to one receiver only. What I need is to send a message to multiple receivers. I need a code sample that would satisfy my needs. Please help! I need to finish ...
1 vote
0 answers
954 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?
1 vote
1 answer
1k views

How do I use I2C from an Arduino Uno when I have a GSM shield mounted?

This may be an extremely obvious question but I don't seem able to find a definitive answer. I have an Arduino Uno and a Sim900 GPRS/GSM shield fitted on top of it. I had I2C working on the Arduino ...
1 vote
1 answer
1k views

How to program the nodeMCU through OTA using GPRS?

I'm using a NodeMCU in one of my projects. The setup is in a remote location. That place doesn't have WiFi so I'm using GPRS (GSM SIM800V) for sensor data collection to my server. Right now I need to ...
1 vote
1 answer
571 views

Arduino MKR GSM 1400 fails to start up without Serial Monitor [duplicate]

This question is similar to another question, but I have added more details. See: MKR GSM 1400 Works only when connected to computer. I have designed and built a custom board into which I plug an ...
-1 votes
1 answer
2k views

Connecting SIM900A GSM/GPRS module Arduino Mega

I have bought the following SIM900A GSM/GPRS module. I need to connect it to an Arduino Mega. Can anyone answer me which pin I need to connect to the Arduino?
3 votes
1 answer
264 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 ...
5 votes
2 answers
10k views

Simulation of Arduino Mega 2560 with GSM Module using Proteus

I have really been suffering with my simulation! Tried connecting my arduino mega 2560 to COMPIM (used as GSM Module) in my circuit and also loaded sample code but damn! In vain! I wanted to view the ...
0 votes
3 answers
2k views

Does the SIM800L works in the US?

I want to know if the SIM800L works on US soil? I can´t get it to work on the H2O network! Does it work wit ATT or I only need the APN settings? If so what are the commands for data connection and ...
-1 votes
2 answers
720 views

How to use AT+CFTRANTX command in SIM7100

I am working on a project using pro mini 8MHz/3.3v and SIM7100, I want to know how can I used AT+CFTRANTX command. I am try to read file from EFS and write to SD card via Serial port. I have get some ...
2 votes
1 answer
574 views

Is there any way to catch the response of SIM800L after sending the at command?

I am using sim 800l with arduino. I am successfully sending AT command from arduino, not in serial monitor but I am unable to catch the response after each successful command execution if its ok or ...
1 vote
1 answer
401 views

SIM808 does not support SSL related AT commands

I am using a SIM808 module. It's working fine with normal MQTT over TCP, but does not work when trying secured MQTT. I sent AT+SSLSETROOT="C:\USER\HENRY_SSL.CRT" to set the root certificate ...
3 votes
1 answer
124 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 ...
1 vote
0 answers
93 views

Low power microcontroller with gprs/gsm and maybe gps on board

Good day to ya all. I have a general question and a potential problem to solve. My plan is to make a device which will work on 2 li-ion batteries. The purpose of this board is to take data from 3/4 ...
0 votes
1 answer
320 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 ...
1 vote
0 answers
3k views

How to connect Nodemcu ESP-32s and GSM SIM800L

The code that I use: #include <SoftwareSerial.h> //Create software serial object to communicate with SIM800L SoftwareSerial mySerial(16, 17); void setup() { //Begin serial communication ...
1 vote
0 answers
288 views

SIM900 AT+CCID ERROR

I have my SIM900 connected to a 12v 2A power source, I have inserted my sim card changed it to 3G/2G(autoconnect) ( I did research it to know wheteher it is possible and it turns out it is, the only ...
1 vote
0 answers
901 views

Getting location working on SIM800L with TinyGSM?

Hey Arduino enthusiasts :) I have purchased a LilyGo T-Call board. Which has a Esp32 processor and a SIM800L GSM module. For my project i want to send location data over the 2G cellular network. I am ...
1 vote
0 answers
377 views

Power Arduino MKR GSM 1400 via VIN

I am working on a project with Arduino MKR 1400 GSM and I would like to power the arduino board using an external power source (https://www.reichelt.de/raspberry-pi-netzteil-5-1-v-3-0-a-usb-type-c-eu-...
1 vote
0 answers
23 views

reading data from server arduino and gsm900a

I am facing a problem in reading data from thingspeak server after each AT command, I get the right response from the gsm However, after AT+HTTPPARA = "URL","thingspeak.com/channels/...
0 votes
2 answers
673 views

A9G gsm module not displaying message body after receiving SMS

I am trying to receive an SMS on my arduino and print it out to the serial monitor. I am using the A9G gsm/gps module for doing that. Here is the code for it #include <SoftwareSerial.h> //...
2 votes
3 answers
2k 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 ...
1 vote
2 answers
3k 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....
1 vote
0 answers
414 views

Interfacing IOT- GA6 to Arduino

Good evening guys, Looking for any help on interfacing the above GSM/GPRS module with arduino. Connections: VCC and GND of module- separate power supply, 5v 3A URX to pin 2 UTX to pin 3 Common GND ...
0 votes
1 answer
2k views

Arduino Based Home Automation System

I am working on my project of home automation system using Arduino GSM SIM900 & four channel relay module. I am facing a problem in my code. Can any one help me on this, SMS is receiving but its ...
0 votes
1 answer
247 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 ...
0 votes
1 answer
663 views

How to update a text file dynamically

I have Two Arduinos, One with the help of sensors it will dynamically updates in to my server database. Other Arduino, reads the stored contents from the server database and sends sms to phones. Now, ...
1 vote
1 answer
1k views

How to fix serial communication problem between Arduino UNO and sim900A

I've connected the arduino UNO to the sim900a. But after checking the serial communication between the two I keep getting these output. Here is the connections and code that I used #include <...
1 vote
3 answers
8k 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 ...
2 votes
0 answers
31 views

i want to combine below two codes [duplicate]

*****1st code int sensoroutput = 3; // the analog pin connected to the sensor int sensorinput = A0; int THRESHOLD = 100; void setup() { pinMode(3, OUTPUT); pinMode(A0, INPUT); // this ...
1 vote
1 answer
114 views

How to connect SIM7100A to Arduino?

I've been searching for how to connect a SIM7100A module to an Arduino (Uno or Mega), but I haven't been able to find any posts anywhere, nor videos nor any kind of documentation that shows how to do ...

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