Questions tagged [sim900]

GSM/GPRS module from the manufacturer SIMCom

Filter by
Sorted by
Tagged with
5
votes
1answer
1k views

Error interfacing GSM sim900 with atmega32 [closed]

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 ...
4
votes
2answers
13k views

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 ...
4
votes
3answers
304 views

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 ...
3
votes
3answers
30k views

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 success. ...
3
votes
1answer
190 views

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 ...
2
votes
3answers
497 views

Is it possible to solder this non-standard package (sim900) using hot-air station?

I don't have any experience with hot-air soldering. Would it be possible for a complete newbie to solder this kind of package using a hot-air station: sim900 http://www.soselectronic.pl/a_info/...
2
votes
3answers
2k views

Is it possible to use SIM900 GPIO to control relays without using external MCU?

From the product manual / reference guide it looks like SIM900 / SIM900A is already equipped with 12 GPIOs. But could not find information on how to use these GPIOs to control relays directly, ...
2
votes
3answers
370 views

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 ...
2
votes
1answer
665 views

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 ...
2
votes
2answers
7k views

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: ...
2
votes
2answers
396 views

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 ...
2
votes
1answer
6k views

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 ...
2
votes
1answer
303 views

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 ...
2
votes
1answer
2k views

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 ...
2
votes
0answers
658 views

How to connect capacitors to SIM800C gsm module [duplicate]

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 ...
2
votes
0answers
88 views

SIM900 questions

I am trying to use this RPi addon http://imall.itead.cc/raspberry-pi-gsm-add-on.html connected to an RPi running raspbian to send data from a temp sensor to a http service. For this I use pppd to ...
1
vote
2answers
3k views

sim900 escape character error

I am trying to send some hex data over TCP using SIM900A module. But the sequence of data has a byte with value of 0x1B which is the escape character. As a result the module terminates the command ...
1
vote
3answers
2k views

Connecting SIM900 to STM32F4 Nucleo

I'm trying to connect Simcom SIM900 to Nucleo-F411RE using the following configuration for USART1: ...
1
vote
1answer
447 views

Using GPIO mode in SIM908

I'm working on a SIM908 module using GPIO mode (my rx pin contact is lost when soldering). I have interfaced it with a PIC16F73 and while using GPIO mode I'm not getting any response. I have included ...
1
vote
2answers
788 views

How can these GPS/GPRS bike tracking locks be so power saving?

I am really puzzled by how these GPS/GPRS, solar-powered bicycle locks seem to be running on very little power. They are fitted with a tiny solar panel. As you may know, these locks are popular these ...
1
vote
1answer
215 views

How to wait for '>' in SIM900 message format

Hello all I am trying to send sms using SIM900 and PIC18F2520. I have button attached to pin of MCU. So whenever the button is ...
1
vote
2answers
676 views

Sim800 FCC Testing for GPRS

I have created a small product using Sim800 and the product uses only GPRS. I am told by the testing company, that I need to create a test firmware which will continuously transmit. The confusion is, ...
1
vote
3answers
5k views

How to simplify UART interrupt handlers on Tiva TM4C with SIMcom 900

UARTIntHandler0 interfaces to the USB UART for debugging. UARTIntHandler1 interfaces to the SIM900 GSM module. The purpose of ...
1
vote
1answer
253 views

How can i replace a electret mic input with headphone output as input

I'm using a SIM800L GSM module for my project. In this module there is a electret mic input pin but I want to give audio to this module from headphone output from a mobile (There is no line in pin ...
1
vote
0answers
2k views

Cannot send SMS with SIM900 GSM module

I have a little problem using GSM SIM900 module connected to the Arduino the call is working alright but it doesn't send me SMS I don't know why. This is my code: ...
1
vote
0answers
390 views

Error sending SMS to SIM900 in PIC

I am trying to interface SIM900 with PIC18F2520. I need to send SMS to a particular cell number. According to AT commands, ...
1
vote
1answer
206 views

Error getting data from GSM SIM900

I am interfacing with GSM SIM900. I wrote a program so that I can read the SMS in SIM900. I have made a function to transmit and receive. Whenever msg comes, GSM responds with ...
0
votes
2answers
1k views

Can't reduce SIM808 Power Consumption

I bought a SIM808 module to use it with a PIC microcontroller. Everything works great but now I'm trying to reduce the module power consumption. The module I have is this one from DFRobot. When the ...
0
votes
4answers
5k views

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'...
0
votes
1answer
833 views

SIM900 schematic verification

I am designing a SIM900 schematic so before going further I thought of verifying the schematic first. I will using SIM900 with <...
0
votes
1answer
167 views

SIM900 SMS timestamps are not accurate enough

I'm experimenting a bit with a SIM900 module and a Raspberry Pi. I can communicate with it and receive/send SMS messages. However, there's a problem when a message that exceeds the 160 character limit ...
0
votes
2answers
249 views

SIM900 Footprints do not match in Eagle

I am designing SIM900 circuit in Eagle. To test the circuit I saved the board layout in pdf and took its print out. I placed the ...
0
votes
4answers
7k views

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 ...
0
votes
3answers
2k views

No communication with SIM900A using Arduino Uno

I am using Arduino Uno and trying to connect to a SIM900A GSM module using serial communication. I am not receiving anything from the module at all. The module powers on and has another LED flashing ...
0
votes
1answer
5k views

What does the GSM AT+CSQ command output signify?

So the command returns the received signal strength(RSSI) and bit error rate(BER). I see that the RSSI is obtained even if the SIM card is not inserted in the GSM module. So what does RSSI signify? ...
0
votes
1answer
698 views

SIM900A No Carrier Issue

I'm using SIM900A mini v3.8.2 GSM/GPRS board to make a phone call on certain condition. I have connected the module through CH340 USB to TTL converter to PC (Windows 10) for testing. All Connections ...
0
votes
1answer
466 views

Use a SIM card module (SIM808) with the less battery possible

I'm using a SIM808 module (on a breakout card) and I want to send only 20 bytes every 6 hours (i.e. 120 bytes per day), containing GPS position and some very short other data. So I think I'll ...
0
votes
1answer
317 views

SIM900a 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
2answers
301 views

Unable to receive response from SIM900

I am trying to communicate to SIM900 with PIC18F2520. I am able to send AT commands using UART but I also want to receive its ...
0
votes
1answer
2k views

SIM900 Circuit Design. Where to connect PWRKEY of SIM900.?

I am designing a circuit for SIM900 with a MCU. I have never designed the circuit for SIM900 ...
0
votes
1answer
169 views

Which pins does the Efcom 1.2 GPRS shield require to be connected in order to work?

I have this GPRS shield for arduino and I'd like to use it later on with some other standalone microcontroller. I have not been able to get it working though without connecting it to arduino and I ...
0
votes
1answer
161 views

SIM900A Strange Problem

Please refer to above circuit. I have a SIM900A module connected with the UART of a PIC. D1 toggles every second, using timer interrupt, to indicate that while loop is running satisfactorily. D2 ...
0
votes
1answer
2k views

SIM900 Power On/Off Circuit

I'm designing a board on which I'll connect a microcontroller with the SIM900 module. The recommended circuit for powering on the module (from the manufacturer datasheet) is given below. The module ...
0
votes
1answer
379 views

Is there altitude limit for GSM(SIM908)? [closed]

I'm using GSM(SIM908) in the machine. I need to know whether there is an altitude limit for gsm to operate. Does GSM just stops working after reaching certain height? I will use SIM908 or SIM808.
0
votes
1answer
688 views

Error communicating with GSM SIM900 with AVR.?

I am trying to interface GSM SIM900 with AVR Controller. Till now I have done programming which transmit the command ATD and it makes a call to my cell. GSM response to this command by sending OK. I ...
0
votes
3answers
2k views

SIM908 GPS STATUS “Location Unknown” Error

I'm using a SIM908 module on a custom board and am having trouble getting the GPS location from it. Everything else works on the module. I can send SMS, make calls and send and receive data from a ...
0
votes
1answer
17 views

send data to server using GET method and sim900a

I am trying to send my data to HTTP server using GET method. When i am sending some hardcoded data manually it is getting stored in database successfully. ...
0
votes
1answer
39 views

Power sim900 shield with raspberry pi

I have a SIM900 shield that I want to control with a Raspberry Pi. I want to use GPIO pins on the pi and UART pins on the SIM900 shield. If I understand correctly the numerous tutorials available, ...
0
votes
0answers
186 views

SIM808 Constantly send unwanted message

I have set the baud rate of sim808 module to 57600 and with a USB2TTL module connect it to my PC. Everything works fine and the module recognize the AT-Command except that constantly send the ...
0
votes
1answer
381 views

AT CSQ returns CME error 604

I'm using an SIMCOM, SIM800. This module was working perfectly fine, but suddenly it stopped posting and while debugging I found out that AT+CSQ was returning "+CME ERROR:604" which according to Telit ...