Questions tagged [gsm]

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

Filter by
Sorted by
Tagged with
2
votes
1answer
51 views

[SOLVED]SIM7600 Module Power up by Arduino Uno doesn't work

Am using SIM7600X 4G HAT with Arduino Uno I follow to manual to Power up the module and it works well, The NET light flashing. But when I connect to Arduino Uno and use DigitalPin 2 write (High -> ...
2
votes
0answers
41 views

How can i tell the power status of a GSM900

What I am after is a reliable way of telling whether the GSM900 shield is powered up or not. "Obviously" the shield power is the constant green light. But i'm talking about the red light on the ...
2
votes
0answers
2k views

Turn led on after ringing once, off after two rings when hung up SIM800

I'm trying to make something that has one led and a gsm module which is SIM800L, I'm using seeeduino GPRS library. What I'm trying to do is that when I call the GSM module and hung up after ringing ...
2
votes
1answer
935 views

2G/3G vs 4G/LTE Cell Connectivity for Sensor Prototype? [closed]

Would love any advice on Arduino cell connectivity. From what I understand: 2G (GSM/GPRS) is a dying technology. AT&T is shutting down its 2G network on Jan 1, 2017. 2G (CDMA) will have a longer ...
2
votes
0answers
301 views

GSM librarys Software Serial conflicts with I2C pins 2 and 3 for Arduino Micro

The GSM library apparently uses the Software Serial library to perform the communication. The Arduino Micro specified pins for the serial connection to the GSM is pin 2 and 3 (doc says, but see def of ...
2
votes
0answers
462 views

Help with school project (Arduino GSM and Thermal printer) [closed]

I'm with some friends from my school and we have started to do a project where we send an SMS text message to our Arduino UNO (with GSM module), which then print the text message on a thermal printer(...
2
votes
0answers
6k views

Sending AT commands to a gprs shield using serial port

I have a GPRS shield connected to an arduino uno board, i want to use the shield to send sms and do phone calls, from a C# Wpf application, the arduino is connected to the application using the serial ...
2
votes
1answer
1k views

How do I use I2C from an Arduino Uno when I have a GSM shield mounted?

This may be an extremely obvious question but I don't seem able to find a definitive answer. I have an Arduino Uno and a Sim900 GPRS/GSM shield fitted on top of it. I had I2C working on the Arduino ...
2
votes
5answers
4k views

GSM dongle instead of GSM shield?

I googled for this problem many times and ended up with no results, so I decided to post it here. Can we use a GSM Dongle (usb dongle) instead of a GSM shield (like SIM900 module) to send and ...
2
votes
0answers
370 views

How can I open simultaneously 2 client socket connections with GSM shield?

How can I open simultaneously two socket connections with a GSM shield? It seems that when I try to open the second connection, it is not opened, and additionally the first connection is closed. ...
2
votes
0answers
535 views

Arduino GSM Shield web server hangs

I use official Arduino GSM Shield with Uno R3. I uploaded web server examples from official GSM library. I use a simple python script to make TCP/IP connections to my GSM Shield web server. I send ...
2
votes
0answers
450 views

Garbled data output from sensor through XBEE?

I have a fio v3 + a 9DOF sensor hooked up to an XBEE. On another UNO board, I have a GSM shield and another XBEE board. The fiov3 is supposed to sample data from the sensor, send it through the xbee....
2
votes
0answers
219 views

GSM shield SIM card troubles

So I'm trying to use the GSM shield to communicate with my smart phone. The SIM card that came with the shield only works with other devices on that network, and it's an obscure latin network that I ...
2
votes
0answers
502 views

SIM 900 + Arduino Mega attachGPRS problem, GPRS_READY

I have connected my GSM module to my Arduino. Using AT commands I am able to connect to internet. Using the following link of tutorials, I tried to connect to internet http://arduino.cc/en/Tutorial/...
2
votes
0answers
213 views

GPS - Speed doesn't update as should - EM408 & Arduino Mega & GSM

I'm developing a system that will get the GPS signal and send it though the GSM with information about position, speed and temperature from some digital sensors. Currently I'm using the GPS EM408, ...
2
votes
1answer
10k views

Sim900 error on AT command AT+HTTPINIT

I want to send data to my php server using sim900 module but I am unable to initialize http service on sim900. code: #include <SoftwareSerial.h> SoftwareSerial gprsSerial(8, 9); void setup() {...
1
vote
7answers
17k views

How to send AT command to sim800l with SoftwareSerial

I have SIM800l module connected to Arduino and I'm trying to initialize it in my setup function with this code: #include <SoftwareSerial.h> //SIM800 TX is connected to Arduino D8 #define ...
1
vote
1answer
69 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 ...
1
vote
4answers
516 views

how to get precise value from float variable?

#include <NeoSWSerial.h> //#include <SoftwareSerial.h> #include <AltSoftSerial.h> #include <NMEAGPS.h> NeoSWSerial GSM(2, 3); // RX, TX: Connect TXD to RX & RXD to TX ...
1
vote
2answers
889 views

Errors when compiling the GSM SMS receive example from the Arduino IDE

I want to receive SMS and check whether the character is 'y' or 'n'. If it is 'y', set a pin to high so that a light glows. I thought I could use the example code given in the Arduino IDE for ...
1
vote
1answer
244 views

What SMS can send to switch LED?

I have code but I don't know how to send SMS from my Mobile I mean what the message I can send to switch the Led? To switch On or Off. I use SIm900 and use this code #include <SoftwareSerial.h> ...
1
vote
1answer
2k views

Arduino GPRS (GSM) shield (SIM900) no long pins

I have bought a SIM900 shield for an ordinary Arduino Uno board. The problem is that it doesn't have long pins on the bottom side, making it impossible to click on mu Arduino Uno. The shield I have is ...
1
vote
3answers
196 views

Arduino GSM Shields stacking

I'm researching options for a project in which I need to send/receive SMS messages to/from multiple users of different service providers. Hoping to reduce costs, I'm thinking of forwarding the ...
1
vote
2answers
4k views

SIM900 Modem is not responding

I'm working with arduino nano and it has interfaced with SIM900 GSM. I'm sending "AT\r" to GSM modem, but not getting response. void setup() { Serial.begin(9600); Serial.println("Setup is Ready")...
1
vote
3answers
6k 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 ...
1
vote
1answer
2k views

GSM and GPS shield pin conflict

I have an Arduino GSM shield and I plan to purchase an Adafruit GPS shield. The GPS module uses Pin 7 & 8 for Rx and Tx, but the GSM shield uses Pin 7 for Modem Reset. Will the overlap on pin 7 ...
1
vote
3answers
4k views

client.connect() fails except the first time

I am communicating with the Web server's database via Arduino GSM shield + GPRS connectivity void loop() { if (client.connect(server, port)) { ....... } else { ...
1
vote
2answers
932 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 ...
1
vote
1answer
640 views

Send big amouts of data to PHP script via gsm module SIM800L

I'm looking for a way to get lots of sensory data from my Arduino Micro to a PHP script. My current attempt is using the following AT-commands: Sent: [AT+HTTPPARA=URL,www.example.com/newData.php?data=...
1
vote
1answer
1k views

Problem sending SMS from a GSM SIM900

I have a laser security system project with a GSM SIM900 and a few sensors. I'm using an Arduino Mega 2560, and everything is working normally, except the GSM is not sending an SMS to the phone and I ...
1
vote
2answers
4k views

LCD display weird characters

Im a newbie. I have a problem with displaying text in LCD (16x2). It shows incorrect message in the lcd. Here is the code and the picture that gives the wrong output : Kindly help Thank you. #include ...
1
vote
1answer
4k 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 ...
1
vote
3answers
5k views

GSM 900A modem not responding to AT commands

I am using GSM 900A modem which requires 5V Supply. I am connecting it to Arduino UNO. I am giving supply to modem by arduino 5V and GND pin. I am connecting RXD pin to TX(pin 1) of arduino TXD pin to ...
1
vote
2answers
2k views

GSM GPRS for sending an sms

I want to know if it is possible to send an SMS from a SIM900 using Arduinos to another SIM900. Problem: When the gsm is connected to the network, it does not send an sms; my airtime balance remains ...
1
vote
1answer
4k views

GPRS SIM900 and GPS NEO-6M don't work together

I'm trying to get GPS coordinates and send them to my API through the GPRS SIM900 and GPS NEO-6M shields. In setup(), I first start the GPRS shield and call the function that connects to the internet....
1
vote
1answer
10k views

Send JSON via POST on SIM900 shield with AT commands

I'm trying to send a JSON POST in SIM900 shield with AT commands. After I call the AT+HTTPACTION=1 command, it returns a 601 error: +HTTPACTION:1,601,0. I saw here that the error was 601 Network ...
1
vote
1answer
11k 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?
1
vote
1answer
674 views

Problem while writing sketch for GSM module sim800

I wanted to my GSM to recieve SMSs. I have written a sketch for it. But while verifying the sketch an error pops out in this part: if (sms.available()) { sms.remoteNumber(senderNnumber, 20); ...
1
vote
3answers
13k views

Multiple If statements

I am using following code for my arduino project in which i have to control a dc motor using arduino uno via text messages. my question is that i have used multiple number of 'If' statements and only ...
1
vote
4answers
6k views

SIM900 AT command HTTP GET request not show the web page

I build a simple HTTP GET request by SIM900. Here is it: -----1----- AT+CSQ +CSQ: 25,0 OK -----2----- AT+CGATT? +CGATT: 1 OK -----3----- AT+SAPBR=3,1,"CONTYPE","GPRS" OK -----4----- AT+SAPBR=...
1
vote
1answer
1k views

SoftwareSerial error

I have arduino , upon arduino I have Arduino GSM shield (Tx-2, Rx-3, Modem reset-7) and upon it, I have the Adafruit GPS Logger shield. I am trying to send sms of Latitude from the GPS Logger shield ...
1
vote
1answer
2k views

Can the official arduino GSM shield library be changed to work with hardware serial on mega

I have a complex requirement that uses a number of libraries that depend on timing I.e. OneWire. When using the official GSM shield on a mega, it loads a version of software serial to talk to the GSM. ...
1
vote
1answer
44 views

Any way a GSM sim 900 can still work (USA)?

so I’m pretty new to arduino and have been working for weeks on a GPS tracker using a sim 900 and a knock off neo 6M. All my code seemed to be working but for some reason I could not get the sim900 to ...
1
vote
1answer
22 views

DFRobot GSM / GPS shield with UNO init error

Apologies, but I have little experience of Arduino etc. Has the "Sim808 init error" been resolved anywhere please? I have tried every example I can find including the ones on these ...
1
vote
1answer
75 views

SIM800L module on Arduino nano

I am trying to get Arduino nano and SIM800L module working together. I provided the module with the recommended external voltage of 4.0V (documentation states 3.6V - 4.2V) transformed via LM2596. The ...
1
vote
1answer
32 views

Can I safely connect my A6 GPRS module to this 5V 2A phone adapter

I have an A6 GPRS module, and my Samsung phone power adapter has output of 5V and 2A. But it also says 9V and 1.6A My Phone's Adapter 👆 So would it damage my A6 GPRS Module if I plug this to it via ...
1
vote
1answer
63 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] ...
1
vote
1answer
251 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 ...
1
vote
1answer
617 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 ...
1
vote
1answer
669 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 ...

1
2
3 4 5
8