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Questions tagged [gsm]

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

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12 views

Somewhat Obfuscated Serial With SIM800L and Uno R3

I am successfully communicating with my SIM800L from my UNOR3 aside form some errors. But the biggest problem is with the serial monitor. Responses from the SIM800L are somewhat obfuscated in that ...
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0answers
20 views

GSM module sim7600E waveshare [on hold]

I have the GSM module present in the link https://www.waveshare.com/wiki/SIM7600E-H_4G_HAT Is it normal for the Ground and data pin of the Main antenna to have a short circuit and same it the case ...
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0answers
20 views

can't interface SIM900 GSM Module with Arduino Mega

I am trying to interface SIM900 GSM Module with Arduino Mega. When I send AT command on COM port in carriage mode then its not sending 'ok' back so I think the interface is not successful. Here is the ...
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0answers
9 views

SIM900A No response at all

I am unable to communicate with the SIM900A (model#:s2-1040W-z091d). I am supplying with an external psu with 5v 1.5mA to the SIM900A connection (SIM900A)RX to (Arduino)PIN3 (SIM900A)TX to (...
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1answer
35 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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2answers
8k views

Getting the contacts/ storing contacts to SIM card

I have the GSM shield and is there any ways to get the stored contacts on the SIM card? It seems that the GSM library does not support writing data onto/ reading data from the SIM card? My aim is to ...
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0answers
14 views

Weird issue with AT+HTTPPARA using arduino uno and sim800l

Right now I'm working on a project that includes gathering data from multiple sensors and sending it to the database with a simple php script. For now I've got two seperate fully working programs - ...
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1answer
36 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
30 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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0answers
14 views

SIM868 does not give GNSS location

I bought SIM868 breakout board with GNSS support. https://www.aliexpress.com/item/33013782111.html However, I can’t get coordinates using standard at-command AT+CGNSPWR=1, AT+CGNSTST=1, etc. I get “+...
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21 views

Nodemcu & GSM module & CLIP problem (CLIP line not always appears on the serial connection)

I'm working on phone-controlled car park gate. Trusted employees numbers are saved on SIM card/hard coded in program. So the idea is, if a trusted person calls the "gate number" ; Nodemcu will ...
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2answers
1k views

Error AT%13% With GSM/GPRS Shield

I've been trying to control a relay with a GSM shield for an Arduino project. I haven't had any success with either the Software Serial or the GSM library. I've declared the GSM variable in debug mode ...
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2answers
90 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
33 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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1answer
3k views

Sim800l gsm module cannot connect gprs data

I am a rookie to arduino. I am trying to access MQTT server using Sim800l coreboard GSM module with Adafruit Fona/Tinygsm library but failed.So I decided to check http GET/POST request with AT command ...
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2answers
1k 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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2answers
178 views

Gsm Sim800l Module

I am using below code for send sms but SMS Sent sucessfully but save in SIM memory & not able to see message text : serialSIM800.write(“AT+CMGF=1\r”); //sending SMS in text mode delay(1000); ...
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1answer
567 views

GMS send SMS text messages many times

The GSM sends many SMS text messages and does not stop. How to send only one SMS? This is my code: #include <SoftwareSerial.h> SoftwareSerial mySerial(9, 10); char msg; int vibr_pin = 7; void ...
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2answers
698 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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3answers
101 views

Code getting stuck waiting for GPS Output

I'm basically trying to make a device that pulls the GPS information from a SIM808 and pushes it to a server online via GPRS. I am sorry as I am not good at programming so ive spent days trying to ...
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1answer
210 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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0answers
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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4answers
10k views

AT+CSTT throws an error

I am getting an error on AT+CSTT="TATA.DOCOMO.INTERNET","","" What am I missing here? Code void setup() { // Open serial communications and wait for port to open: Serial.begin(9600); while (!...
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1answer
9k views

Sim800 sim card requirements

What kind of a sim card is required for sim800 module? I know it must be activated and must be valid. But about 2g, 3g or LTE...What kind of a sim card in overall should I use with this module?
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2answers
131 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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3answers
31 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
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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0answers
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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0answers
39 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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3answers
5k views

Arduino GSM shield GSM_READY not ready ever

I am using an Arduino Mega and an Arduino GSM shield. I am using the receive SMS example under GSM in the Arduino IDE. My GSM shield's hardware IP is set correctly. Here is the sketch: /* SMS ...
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1answer
317 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
42 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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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
2k views

Is the A6 module broken?

Hi recently I've could send some messages with the A6 GSM module, which uses AT commands. To switch on the board, you need to press the power button about 4 seconds or connecting the VCC pin to the ...
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1answer
28 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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1answer
190 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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2answers
1k views

how to make GPRS/GSM SIM900 shield work with gps neo-6M module using Arduino UNO board

I'm a beginer to arduino program.i will like to make a program that will send latitude and longitude on my mysql database.so since 3 days i try to learn how to use all this material(GPRS/GSM SIM900 ...
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0answers
35 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
385 views

Data is not sending to Thingspeak using SIM900 with an interrupt in the code

I'm currently working in a weather station with online recording on Thingspeak. When I send a set of parameters (T, Pressure, Humidity, light), I don't have any problem with sending data. But when I ...
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1answer
714 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
936 views

SIM800L and Arduino Sleep - getting whimsy Serial output after 5 calls

i'm working on project where i'm trying to achieve that arduino parse caller ID so i can use it later to send SMS with sensor reading data. Somehow i made that code (with much googling) and it works ...
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1answer
62 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
227 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
53 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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1answer
21 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 ...
0
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0answers
28 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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1answer
827 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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0answers
523 views

Make a GET Request GPRS

I'm building a weather station that sends the data to a webserver via GET request. I was wondering if you guys can look into my code and help me. I looked all over the internet and can't find what'...
0
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0answers
35 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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1answer
113 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 ...