Questions tagged [gsm]

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

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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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21 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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1answer
1k views

SIM800L can't send SMS

I have a SIM800L module (green board). I used this to test my module. In that page, it use a SIM800L red board with a 3.7v LiPo battery. But I directly connected 5v from the Uno to the module. GND ...
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20 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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1answer
131 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
238 views

GSM library_ all examples ar working except GPRS?

i am using arduino uno and sim808. i connected the sim808 to pins 2,3 on arduino uno and used GSM library. i tested all examples: make and receive a call or messages. the part of GPRS initialization ...
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1answer
28 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 ...
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56 views

What is the critical level of memory usage for Arduino Leonardo

Well I have a GSMshield with arduino leonardo and making some codes. Because of out of memory arduino stop to do something. I do not want to be misunderstood, I dont want fix this code, because I am ...
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1answer
78 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 ...
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20 views

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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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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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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2answers
618 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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0answers
34 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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1answer
277 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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21 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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28 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
258 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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1answer
37 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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0answers
14 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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2answers
153 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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2answers
17k views

How to receive data from my server database to a variable in my Arduino?

I am learning to work with the client - server communication. I am able to communicate with my server and able to store values in the table. But I want to receive one of the specific data from the ...
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2answers
2k views

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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1answer
17 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
737 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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73 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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1answer
60 views

GSM module not working after power off

I am making a project on gsm module(sim 900a unofficial shield), when I will send a SMS led will turn ON. after uploading code, module works fine, and led turned ON after sending message. But when I ...
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3answers
296 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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0answers
30 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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0answers
36 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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14 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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1answer
727 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
1k 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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19 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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0answers
21 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
2k views

How can I add phonebook entry to sim card using Arduino GSM shield?

I am using Arduino GSM Module and Arduino UNO I want my GSM module to be stand alone once I programmed it. It will store the phone number of the user if he sends a correct passcode. Since I want the ...
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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
224 views

Turning LED On/Off by using SIM808 with Arduino Mega

I am trying to turn an LED on/off by using GSM 808 module. Here #a0 = LED off and #a1 = LED on. I have used lcdShow function to display characters in LCD display. But nothing appears on display. What ...
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1answer
871 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
197 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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2answers
55 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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0answers
15 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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0answers
33 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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2answers
11k views

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
22 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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0answers
24 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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2answers
3k views

GSM Modem Connection Directly to Rx and Tx

I am using Arduino Uno and using SIM800 GSM GPRS modem. I am connecting Arduino directly with SIM800 GSM/GPRS modem. I already read manually about GSM like how much power supply it needs and what ...
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1answer
37 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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0answers
52 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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28 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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