Questions tagged [gsm]

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

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34 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 ...
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1answer
36 views

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

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 ...
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15 views

SIM800C status LED not blinking

I am using an Allwin HW-537 SIM800C module. I am also using a 3.7V 2200mAH ICR18650-22F battery which discharges about 4-5 amps according to the datasheet. However, I am unable to get the status LED ...
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30 views

Send message to multiple number

sim.println("AT+CMGS=\"+91xxxxxxxxxx\"\r"); I don't want to write this. I want to write mobile number on serial monitor in Arduino and on that number, i want to send message. how ...
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21 views

Send data from GSM module to cloud server like firebase

I am trying to search for anything to send my sensor data from Arduino + GSM SIM900A to a cloud server, preferably firebase. Does anyone know how can I achieve this operation to firebase or any other ...
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22 views

GSM900A module is not connecting to the network

My GSM900A module is not connecting to the network. IT continuously blinks(1 sec). The power was given by the Arduino Uno board. Then I tried connecting an external battery(4.2V , 4200mAH). But it ...
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35 views

GSM900A module insert simcard

I connected the GSM with Arduino as stated, it responds to commands like AT+CFUN and some other than relating to sim card functionality, I have inserted a working sim card and still brings up CME ...
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10 views

which kind of data are store If i terminate the call in sim800?

I'm working in SIM800 for DTMF based project. I want to know which kind of data are stored in the buffer during termination of call in SIM800. How to find if call was disconnected in SIM800? Also ...
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1answer
31 views

Send JSON body with SIM900 board

I'm trying to send JSON, but i'm not able to set Content-Type header. Other commands are successful: [23:49:41:856] AT+SAPBR=3,1,"CONTYPE","GPRS"␍␊ [23:49:41:899] ␍␊ [23:49:41:899] ...
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1answer
67 views

How do I connect 4 or more Arduinos to a single shared GSM Module?

Is it possible to connect 4 or more Arduinos to a single GSM Module.? All the Arduinos need to send SMS at a specific time daily. How do I make sure thet don't time collide with each other, other than ...
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86 views

Arduino Uno + SIM808 EVB 3.2.4 not working properly?

So recently I found this tutorial online about the SIM808. It looked super cool so I ordered the sim808 evb 3.2.4 off amazon. Hooked up the module and connected the RX (11) and (10) TX pins. Here is ...
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SIM900 module connects then disconnects from carrier soon after

I have an Arduino Mega 2560 with an ESP8266 built into it, and a SIM900 shield, which I am building a project with. The shield is powered by an external adjustable 3-12V, 2A supply set at 6V so power ...
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32 views

Help with reading and storing data from sim module

I'm using a sim800C module and an Arduino Uno. I want the code to send back an SMS to a number which sends it the password. So, if the sim module receives 'abcd' I want it to send back an SMS, saying '...
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34 views

http request with the A6 gsm module

I have been trying to implement a simple HTTP get request with an A6 GSM module, and am finding it very difficult, i couldn't get any useful docs or tutorial online to guide me through, all i could ...
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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 ...
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18 views

Fastest sim module available?

I have used sim900 in my project but it isn't fast, I don't know if it is because it is on 2G or what, I wanna know if I can get something good that can send SMS messages immediately and doesn't take ...
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I'm able to send messages from SIM800a module and receive “+CMGS: 177 Ok” but I'm not able to receive it in the number entered in the code

#include <SoftwareSerial.h> SoftwareSerial mySerial(10, 11); char msg; char call; void setup() { mySerial.begin(9600); // Setting the baud rate of GSM Module Serial.begin(9600); // ...
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87 views

Using sim900a GSM module, sending data to xampp Database

I am using a soil moisture sensor, dht11, and a relay module. To send data to xampp (database) sever I used the sim900a GPRS module and wrote a PHP code as well. But it doesn't connect and pass data ...
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23 views

Make WiFi Router Using Arduino board

void switch_led() { bool SwitchReading = digitalRead(SWITCH); if (SwitchReading == HIGH) { Serial.println("Now pressed...."); state = state + 1; if (state % 2 != 0) { digitalWrite(LED, ...
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31 views

Adding SIMCOM SIM 900A to Arduino Fire Fighter Robot for sending alert messages

I had made Arduino Fire Fighter Robot. I want to add SIMCOM SIM 900A GSM module to Arduino. When flame sensor will detect fire then " Fire!!!" message will be sent to mobile phone and when ...
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1answer
69 views

Arduino Uno R3 cannot detect GPRS Shield SIM900

I am new to Arduino which I got only this week for my project which sends sms from my windows application. I have Arduino Uno R3 and GPRS Shield (Simcom) Sim900 (S2-1040S-Z0912) I am currently ...
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18 views

Sending AT Command for sms to arduinoShield

i have a Arduino GSMShield and I want to send SMS. When the module try to connecting to the network, it print AT+CREG? Dont know why cause there's no serial.println for this int8_t answer; int ...
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78 views

GSM shield with SIM900 is not logging in network

Hello Adruino friends, I would like to hook up a small project. In need this for resetting my firewall at home because it's doing strange stuff from time to time. I followed the instruction of the ...
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37 views

Program is executing but AT commands not showing in serial monitor

My purpose was to send SMS using GSM SIM800L coreboard and Arduino UNO. Here is the code #include <SoftwareSerial.h> //Create a software serial object to communicate with SIM800L ...
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25 views

sim800l gsm module reboot command

i have a project to control a relay by sms and call by arduino and sim800L gsm modem and i need to modify the code below to by adding command to reboot or reset the modem ever hour i mean delete all ...
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58 views

How to use AT+CHTTPACT command in SIM7100 and Arduino

I am try to send data over http using SIM7100, here is my code loading into Arduino. I am testing php code and GET function by postman application. #include <SPI.h> char answer; void setup() {...
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25 views

How to connect SIM800C to Arduino Mega?

I have the SIM800C module shown in the attached photo, and I have an Arduino Mega. I just want to be able to send messages and do GET commands. My problem is simple: I have no idea how to connect it ...
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37 views

How can I check FTP file size on SIM800L? +FTPSIZE not work for me

I am uploading an image file to FTP using SIM800L AT commands. Sometimes the file arrives missing a part (usually at the bottom) and also the size of the image is smaller than the original. I would ...
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1answer
24 views

Problem communicating with GSM module which is a Fona 3G from adafruit

My issue is fairly simple to describe but I have no idea what the problem could be. So I got my FONA 3G and immediately after taking it out of the box, I connected the battery and I wired up my FTDI ...
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2answers
199 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 ...
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30 views

SIM900A network connection

I can't connect to the network. Hardware used: Arduino UNO and SIM900A GSM module Tutorial used: https://www.instructables.com/id/GSM-SIM900A-With-Arduino/ Sim card used: Orange (I set it on 2G ...
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2answers
67 views

Arduino SIM900 No SMS received

I tried the tutorial in this link https://lastminuteengineers.com/sim900-gsm-shield-arduino-tutorial/ to send an SMS message using a SIM900 GSM shield I completed the section to send AT commands ...
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52 views

Problem sending GPS coordinates with SMS when requested

I have made a project that sends GPS coordinate but the problem is, when GPRS sends coordinates as 00.0000,00.000. So, I want to know if my code is wrong. Thank you for your answer. #include <...
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45 views

Receive SMS using Arduino Nano and Quectel EC25

I'm trying to use an Arduino Nano to communicate with a Quectel EC25 module from this Raspberry Pi 4G HAT. I'm using Arduino's pins 8 and 7 to communicate with RX and TX from the Quectel module. I'm ...
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24 views

Sim900b(chinese sim900a) AT+HTTPACTION=(0/1)reboots the module

I am trying to make an HTTP request in two ways Connecting sim900 to pc using TTL converter (without external power, only USB power) Connecting sim900 using Arduino nano (tried with and without ...
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1answer
54 views

Make phone call over 4G LTE

I have used the SIM800L module in the past, but with Ting shutting down their 2G network, I have been looking for alternatives. I have a SIM7000A, but I can't seem to find a microphone or speaker pin. ...
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72 views

Arduino pro mini and SIM800L problem with GPRS

I'm trying to create a datalogger that sends data to a server at a certain time. I use SIM800L and Arduino pro mini. Wiring: SIM800L Arduino mini pro RST 7 TX 8 RX 9 ...
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29 views

Internet switching

is it possible to switch internet connection from esp8266 wifi module to gsm sim 900A internet if the arduino detects that the esp have no internet connection and vise versa? Thanks
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37 views

Using SMS to receive password, then to choose whether to turn the relay on or off

I'm trying to use SMS messages to turn a relay on/off but before doing that i need to have a password system before allowing the user to turn the relay on/off. Basically, you have to send the password ...
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1answer
454 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 ...
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51 views

How to send sms message on specific area using Longitude and Latitude

Good day everyone! what code should i used for sending sms message depends on the area. the things that i used in my protoype i have MPU6050 accelometer, SIM800C GSM MODULE, NEO6MV2 GPS MODULE. So the ...
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51 views

Using SMS to send commands to the Arduino. Having problems in data parsing

I'm still inexperienced in programming and i apologize in advance if my mistakes are stupidly obvious. This sketch I'm working on is a basic GSM project using SIM900a Mini and an Arduino UNO that ...
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1answer
512 views

SIM800L LED is not blinking

I am using a SIM800L Module with esp32. I am using a 3.7V 2800mAh lipo battery to power the sim800L but the LED is not blinking. I am lookng for answers in web but evryone seems to have a different ...
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1answer
211 views

Blank output in serial monitor

So my SIM900 GSM Shield is working fine with Netlight LED blinking and Status LED solid light, after I upload the code nothing happens about mySerial() in my serial monitor. Can I take your time for ...
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1answer
48 views

GSM+GPS modules

Say, I need to track a vehicle using Arduino and a (GPS+GSM) module. Though GPS can be used to get Location of the Vehicle(and then sent using GSM), why would we even do it using GPS if we already ...
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1answer
104 views

Can I put a T-mobile sim card into the SIM800L Module? [closed]

I am trying to connect my SIM800L module to my arduino, but am confused what kinds of sim cards work. My phone currently is an IPhone XS, and I would like to take my tmobile sim card from there and ...
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56 views

The LED on SIM800L module doesn't blink and the module isn't working

I've recently purchased a SIM800L module from a local retailer. When i have inserted a SIM card and powered it up, the led doesn't blink at all. I have bought the module with a LM317 circuit on board ...
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2answers
309 views

SIM7600 A-H not responding directly when connected through pins

I am working on a project which utilizes three components: Arudino Pro Mini(5v) Breakout SIM7600 A-H from AND technologies 9V Battery (connected to RAW and GND on the Arduino board) I am trying to ...
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0answers
225 views

SIM868 AT+CIPGSMLOC returns latitude and longitude location as 0.000000

I am unable to get any location data from SIM868 module using the command AT+CIPGSMLOC=1,1 It returns 0.000000,0.000000,2019/12/23,08:50:39 I have internet enabled using AT+SAPBR=1,1 command. ...
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21 views

Index of the latest sms message

I want to read the most recent message received and I know that to read messages I need to use AT+CMGR command but it needs the index of the message in order to read it. How do i know the index of the ...

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