Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [sim900]

GSM/GPRS module from the manufacturer SIMCom

Broadly used GSM/GPRS module from the manufacturer SIMCom, with serial communication to issue AT commands and configure/control the module.

SIMCom's SIM900 documentation

61 questions
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Error interfacing GSM sim900 with atmega32

Hi all I am trying to interface GSM SIM900 with atmega32. I have a written a code in which if a user press a push button, a call will be made to a pre defined number. If we want to change the pre defined number, we can send message like…
anna carolina
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SIM900 Error on AT Command AT+SAPBR=1,1

I intend to send some information through GET method to a php page using the SIM900 module. I tried the following sequence of commands with…
Sergio
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3 answers

SIM900 Conducted Emissions Fail

I'm currently having trouble getting a product through EMC. Radiated emissions were comfortably under the limit, but conducted are failing badly. Here are the results: The noise appears to be largely common mode, with the exception of the first few…
Skov
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Posting to php server using SIM900 GPRS with AT commands

I am using a SIMCOM SIM900 GSM/GPRS module in an embedded hardware application. Rather than sending device data to a server by SMS (what I've been doing so far) I want to switch and start using GPRS to post data to a server with a PHP script I've…
LShaver
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Two different circuits not working on same power supply.?

I have designed a SIM900 circuit on a zero pcb board for testing purpose. It is working fine. In my application I need to make a call and then talk to the other person on call. So I have used PIC MCU to initiate a call whenever a person press the…
S Andrew
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How to Make Sure SIM900 modem will always give me +PSSUTTZ string?

I am using SIM 900 modem to enable GSM connection wirh my product. Micro-controller Communicates with SIM900 modem through a SET AT commands over UART. My product is time critical and i need to have updated time even after power failure. To achieve…
Vagish
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6 answers

SIM800 PWRKEY - Automatic start

I need to do when the module have connected power supply, it will automatically turn on the module. Because is there a PWRKEY button, probably grounding it or give on that pin VDD_EXT will not work. I've read whole Hardware documentation, but I…
GAMELASTER
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SimCom SIM5360 sharing SD card with uController

I am designing a data logging system that uploads its data via 3G. I'm going to be sampling an I2C sensor at 10Hz, buffering this in local memory (or FRAM), and then dumping the contents of the buffer to an SD card periodically (every few…
Steve
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How to send HTTP parameters using POST method and SIM908 GPRS

I want to send HTTP parameters using POST method through SIM908 GPRS. Here is and example of what I want to send: POST /path/... HTTP/1.1 User-Agent: SIMCOM_MODULE Host: website_name Content-Type: application/josn; charset=utf-8 Content-Length:…
Arghavan Mohammadhassani
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What is the best way to receive unsolicited response from GSM SIM900 in PIC18

I am using PIC18F2520 and trying to communicate with GSM SIM900. I am using UART interrupt to receive data from the GSM. I am saving each byte in rxData. Now most of the commands ends with response OK. But there are few commands which does not…
S Andrew
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SIM900 antenna design

I'm designing a hardware for a hobby purpose involving SIM900. I'm a newbie when it comes to antenna design. I was wondering what would be the best antenna choice to start with. Even though chip antennas do have some design complexities involves,…
user3824502
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How to connect capacitors to SIM800C gsm module

I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens because of a high load (up to 2A) that causes a…
Nelson
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SIM900 CR2032 rtc battery backup

I would like to use a CR2032 battery to power the internal RTC of the SIM900 gsm module. The datasheet (given in the link) says that the battery should be rated at 3V. They also give the following reference circuit for non-rechargable batteries…
Marko Scekic
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SIM800 - HTTP Get request time out

I've been working on a weather station project, and I used a SIM 900 module to upload the data to a web server. Recently I started using a SIM800-DS for the same purpose and I had to rewrite the code without using the simcom HTTP stack. Here I ran…
chamod
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connecting speaker and mic to GSM SIM 900

I have a gsm module but unfortunately it doesnt have an output for mic and speakers. I need to integrate mic and speaker too. In my GSM module, there are male pins available for mic_P mic_N for microphone and spk_P spk_N but I dont know how to…
anna carolina
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