Questions tagged [gsm]

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

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votes
1answer
6k views

Which pins of an Arduino UNO can be used as Tx and Rx pins for connecting to GSM GPRS SIM 900A

I am using Arduino UNO and SIM 900A. Pins 0 and 1 are used as TX and RX. Is it possible to use any other pins?
9
votes
4answers
960 views

Which shield to use for GPRS?

I'm planning to build a device that would read some sensor data and send it via GPRS, eg. once per day. (Not that original, yeah.) But my problem is choosing a GSM/GPRS shield. The official ...
4
votes
3answers
4k views

Arduino shield stacking

I have an Arduino GSM Shield mounted on an Arduino Uno. Can I stack this GPS shield above Arduino GSM shield? Will there be any pin configuration problem? In GSM Shield hardware pin’s configuraton ...
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
2answers
9k 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 ...
0
votes
1answer
407 views

Arduino Mega 2560 with SIM808 module - Incomplete SMS response

I have this code to read a SMS: String read_SMS(int index) { Serial.println("--START READ SMS POSITION" + String(index) + "--"); delay(400); sendATcommand("AT+CMGF=1", "OK", 1000); // sets ...
0
votes
1answer
38 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) ...
11
votes
2answers
9k 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 ...
3
votes
2answers
11k views

Is the SIM900 3G? Or is the SIM900A able to connect to 3G?

I would like to state that I am not familiar with the whole cellular connection thing. But I was wondering if the SIM900/or/SIM900A is 3G and will work with PTel Mobile. I need this Arduino to be ...
1
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2answers
3k views

DB:NO RESP Using inet.httpPOST on loop()

I'm using SIM900 module + arduino uno + gsmlib.org library. I'd like to send a string to endpoint on my API , and it worked correctly for the first time when I using inet.httpPOST function in setup(),...
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
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1answer
9k 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 ...
0
votes
1answer
2k views

How to set Delay on GSM shield?

I bought a Gsm module recently(not official arduino shield) and i connect it to Arduino uno. The problem (I guess) is , i can't set delay properly, the terminal send it too fast that i missed it or ...
5
votes
2answers
8k views

Receiving SMS by Arduino GSM Shield and control the LED with the content of this SMS?

I am using Arduino GSM Shield receiving SMS from an Android app. And the content of this SMS will control a LED. If the content of this SMS is not "off", the LED will be on and the content will be ...
1
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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
1k views

GSM and GPS module don't work together

I am trying to create a project which involves getting latitude and longitude via GPS Module and send it via GSM Module. My problem here is that individual code is working perfectly. However, if am to ...
1
vote
1answer
5k views

Arduino: Connect UNO to A7 AI Thinker

I just cannot connect or send AT command from my UNO to A7 AI Thinker module. This is the connection: UNO -> A7 TX -> RX RX -> TX USB || 5V -> External Power ...
0
votes
3answers
4k 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 ...
0
votes
3answers
3k views

Unable to receive and print SMS on the serial monitor with Arduino Uno and SIM900A

I'm trying to receive an SMS and show it on the serial monitor. My code is as following: void setup() { Serial.begin(2400); Serial.write("AT+CMGF=1\r"); //set GSM to text mode ...
0
votes
3answers
117 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 ...