Questions tagged [gsm]

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

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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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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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1answer
29 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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11 views

How to automatic receive call? [closed]

Can someone give me some AT command for making auto accepting calls im using sim800c and arduino mega
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21 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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sim900a mini doesnt respond to any AT commands [closed]

please i have been so tired with this sim900a somebody help me doesn't connect to network , i mean doesn't responded to AT commands
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sim900A mini with arduino uno

my sim card in sim900A mini doesnt work when i call doesnt respond ........ i mean switched off doesnt responde to any AT commands please i will be pleasure to help me . { #include <...
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2answers
10k 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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2answers
367 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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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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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
80 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
32 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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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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35 views

No respond from Arduino pro mini and SIM7100 module

I am trying to run code on Arduino pro mini and SIM7100, I have connected RX to TXD in GSM board and TX to the RXD, and uploading code to send SMS, but there is no respond, any help would be ...
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1answer
139 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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100 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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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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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
43 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
71 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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38 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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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
696 views

POST request on Arduino MKR1400 GSM not working

Im trying to send a POST request from the Arduino MKR1400 GSM board to a server with a database. I've tested the server using Postman (https://www.getpostman.com/) and it handles the POST request ...
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2answers
860 views

Error while updating ThingSpeak using SIM808

im trying to update ThingSpeak from a SIM808 but I'm getting a network error. Please check below and let me know if there is anything wrong in my methodology. I'm using terminal.exe to send commands ...
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1answer
57 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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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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2answers
729 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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2answers
6k views

Arduino 4G LTE Shield

Is there by any chance a shield that can take an 4G LTE compatible SIM card activated by a carrier and establish a connection?
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1answer
409 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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8k views

SIM808 module: GSM location command (AT+CIPGSMLOC=1,1) giving wrong value after execution of sending message command (AT+CMGS=+91xxxxxxxx)

I wrote the code that if an interrupt is generated, get GSM location and send a message. The first time the interrupt is generated, I got the correct GSM location using AT+CIPGSMLOC=1,1 and ...
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1answer
44 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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2answers
195 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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1answer
44 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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3answers
160 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
538 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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770 views

SIM800C, CPIN: NOT READY (ERROR CODE : +CME ERROR: 10)

I'm using a SIM800C module, and usually it works fine, but lately it has started giving the error "+CPIN: NOT READY" with ERROR CODE : +CME ERROR: 10(SIM NOT INSERTED). As soon as I get this message, ...
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21 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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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
213 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
37 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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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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102 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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0answers
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
470 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
838 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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1answer
40 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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1answer
108 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
236 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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