Questions tagged [gsm]

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

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30 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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9 views

Using NeoSWSerial library with EnableInterrupt and a GSM board for Arduino Uno

I've recently bought a SIM5320E GSM shield board for Arduino Uno and I've managed to get it working nicely - to send txt messages etc. The GSM shield can only use pins D2 and D3 for RX and TX. I would ...
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36 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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29 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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16 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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15 views

How to take input to the system using a GSM module [closed]

Hey I want to take the received sms to the GSM module as an input and respond to it.My project aim is to find whether the person is safe or not .So to know the response of the person what I need to ...
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41 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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40 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
38 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
35 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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17 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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55 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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65 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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18 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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1answer
38 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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54 views

SIM900 module not reading Sim Card

I am using GPRS Shield for Arduino Uno with SIM900 module on it. I am able to communicate with the module just fine (using AT commands), but whenever I try to use a command which involves sim card (...
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33 views

Sim900a AT+HTTPREAD does not get fully answer

changed the firmware on SIM900B try to send get request http://dummy.restapiexample.com/api/v1/employee/1 AT+HTTPACTION=0returned +HTTPACTION:0,200,98 but, when I try to read (AT+HTTPREAD or AT+...
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1answer
39 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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33 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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24 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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31 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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55 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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44 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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1answer
176 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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100 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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19 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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22 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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21 views

Checking Specific Brand SIM card Type Available in GSM module

Can I program a GSM module to accept a specific type of Sim card to be ready by the module? If so please post something that can give me an Idea of how do it. Generally I want to lock the GSM module ...
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17 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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74 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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54 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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57 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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288 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
113 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
98 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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31 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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63 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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34 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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99 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
32 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
48 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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39 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
41 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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219 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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175 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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19 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
209 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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28 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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206 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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10 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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