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Questions tagged [sim900]

The SIM900 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications.

The SIM900 is a complete Quad-band GSM/GPRS solution in a SMT module which can be embedded in the customer applications.

Featuring an industry-standard interface, the SIM900 delivers GSM/GPRS 850/900/1800/1900MHz performance for voice, SMS, Data, and Fax in a small form factor and with low power consumption. With a tiny configuration of 24mm x 24mm x 3 mm, SIM900 can fit almost all the space requirements in your M2M application, especially for slim and compact demand of design.

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AT Commands HTTP request to JSON source with status 200 but empty response

I am working with an Arduino Mega and a SIM900 GSM/GPRS shield to make a get request against my own API. I am using the following AT Commands, the module executes the request, but I receive a 200 response code without a body/response. Here is my…
NiklasUllmann
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Send APDU commands to simcard through SIM900 module

Is that possible to send APDU commands (as done in javacard terminals) to a sim card inserted into a Sim900 module? How can one do that? Is there any reference for setup and APDU commands instruction? Appendix A: In this document, I found that there…
MJay
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Send message from website to SIM900 without SIM900 HTTP REQUEST

At the moment I'm working with the Arduino and SIM900, well, I could say I'm intermediate with the SIM, I could accomplish sending data to my website and receiving data from another phone. But now I would need that when I press a toggle button on my…
Matheus
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How to control an led from Thingspeak server using SIM900A and Arduino?

I am trying to control a LED from Thingspeak server by using the GSM module. The data received is successfully being printed on serial monitor(which is '1' as last updated) but when I am trying to assign that data to a variable so as to control the…
Ankit Sharma
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How to connect arduino Uno with gsm/gprs SIM900 shield to firebase?

Need to connect my arduino uno board with gsm/gprs solution to a firebase database in order to store real time data from water quality sensors. sensors are all connected and the gsm module is working fine. But couldn't find a way to connect the…
Nivarthana
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Sending multiple post requests with sim800C

I am working on the sim800C board, primarily on sending HTTP post requests. As I understand from manual and samples online, the process of sending a post request with AT commands involves: Configuring Bearers: open a bearer and set it…
Sam Yu
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Network providers in USA that can work on SIM900 or Ai thinker A9g GSM modules

I am working on a sensing device that is installed remotely, I want to send the data to my mobile phone via SMS. The GSM module I am using inside my device is Ai thinker a9g. I have tried a couple of sim cards but they are not supported. I wanted to…
Hanan
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Arduino shield SIM900 doesn’t respond to AT Command

I've an Arduino Uno connected to a SIM900 shield (the one in the picture). I can send a message to my phone number, when I execute this code on my Arduino (That's why I think the Arduino and the shield are working) However, when I try to execute AT…
amansour
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SIM900 Reception buffer issues

Actually I'm working with SIM900, I have a problem with Reception character, so I can't receive an "OK" for each message that I send to the chip. I would like to send an SMS or make call. I use STM32F429 waveshare board and below and the functions…
zinhom69
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SIM800L CIPSEND error, cannot make requests

I am trying to connect to internet via the SIM800L module, I tried several things but I end up having an error in the CIPSEND command, I tried without specifying the amount of characters but still the same issue. Previously I was able to execute…
Rodrigo Miranda
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Arduino, GSM shield, AT+CMGR and +CMGL don't respond with SMS text data

I am new to Arduino and GSM shield. I have been working with SMS, and I have a problem to read the SMS's text contents from the modem. Here is the setting for the Arduino and the GSM. #include SoftwareSerial sim900(7, 8); #define…
Misaki Nishimoto
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Store value in variable after HTTPREAD

I am working with a GSM SIM900 and an Arduino Uno. I am using AT commands for the SIM900. I am successfully getting data from GET requests and showing on the serial monitor, but after the AT+HTTPREAD command I want to store data into a variable. How…
Ans Bilal
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Sim800l AT+COPS returns 0 and AT+CREG returns 0,3

Yeah I know there is similar questions in this community But they didn't help. It's for some days that I play with SIM800l.It's response to my at commands is good but when I want to send SMS I'll get problem.I think this Screenshot says most of…
amin
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Unable to send variable data to php server using AT commands on SIM900 RS232 module

I am using SIMCOM SIM900 module and Arduino uno. I am able to send Static data to the server using the AT+PARA command but am unable to do so when sending just the variable data. The variable is continuously storing data received from a sensor. Is…
Shreevatsa Acharya
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Receiving SMS issue with SIM900 on arduino

We're having an issue about receiving an SMS with SIM900. According to our program, SMS that we sent is must be in a certain format to be accepted. For example sending #m1 to Arduino must switch a green LED on and any other texts must be ignored by…
Ahmet Said Özmen
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