Questions tagged [sim900]
GSM/GPRS module from the manufacturer SIMCom
61
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Why does the SIM800C stop sending data to the server after three days of continuous use?
I created a device that monitors air quality. The measured data is then sent to a web server using an ESP32 (programmed in C++ with Arduino framework) and SIM800C module, which stores them in an ...
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0
votes
1
answer
78
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GBoard SIM900 and Usbasp - power supply issue
I bought Gboard module with Atmega328P inside:
https://wiki.iteadstudio.com/Gboard
I don't want to use Arduino at all. I just want to upload my own code into Atmega328P and make a phone calls without ...
- 1
1
vote
0
answers
782
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SIM800L microphone problem
I want to feed SIM800L a microphone signal.
I found this page in the datasheet and it worked but I need more a sensitive microphone. I want to hear voices in room as much as possible, like a spy bug.
...
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0
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1
answer
199
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Can a server send data to my SIM800c while it is in sleep mode?
I have a SIM800c and I'm also using an adafruit.io server. I'm building an alarm system and I'm wondering if I will be able to send commands to the system using the server while the GSM module is in ...
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1
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140
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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
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1
answer
124
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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, ...
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2
answers
2k
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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 ...
0
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1
answer
3k
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SIM900A no carrier issue
I'm using a SIM900A mini v3.8.2 GSM/GPRS board to make a phone call on certain conditions. I have connected the module through a CH340 USB to TTL converter to a PC (Windows 10) for testing. All ...
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2
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3k
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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 ...
- 1,834
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1
answer
680
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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 ...
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4
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12k
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How to wake up SIM800 module from sleep, after entering sleep mode 2 (AT+CSCLK=2)?
I want my SIM800 module (I interfaced it with Arduino Uno) to enter sleepmode-2 (I used AT+CSCLK=2 command). My question is, how do I wake it up from sleep? I tried giving various AT commands but I ...
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347
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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 ...
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1
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1k
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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 ...
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3
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911
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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 ...
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1
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1k
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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 ...
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0
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3k
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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:
...
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6
answers
11k
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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'...
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3
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458
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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 ...
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-2
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2
answers
227
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Will Sim900A work in Angola(Africa) [closed]
We are using SIM900A IC in our project. I found out that SIM900A is region based. What I want to know, will my device will work in Angola Africa?.
If not then what will be a compatible IC(Pin o pin) ...
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1
answer
1k
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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 <...
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1
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3k
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SIM900 not getting powered on
I have a circuit where I am using a SIM900 GSM/GPRS module. As per the datasheet it needs 3.4 V - 4.8 V and upto 2 A of current. ...
- 621
0
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1
answer
199
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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 ...
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2
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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:
...
0
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1
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3k
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ATD SIM900 response.?
I am designing an application where I am interfacing SIM900 with PIC18F2520. I am making a call to a number using ATD. Now if the receiver end do not answer the ...
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2
votes
1
answer
454
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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 ...
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0
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2
answers
358
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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 ...
- 621
3
votes
1
answer
265
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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 ...
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1
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1
answer
232
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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 ...
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1
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0
answers
441
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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, ...
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2
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2
answers
574
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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 ...
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2
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304
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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 ...
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1
answer
2k
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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 ...
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1
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2
answers
847
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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, ...
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1
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205
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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 ...
4
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3
answers
555
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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 ...
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4
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2
answers
15k
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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 ...
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3
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3k
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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 ...
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0
answers
979
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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 ...
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1
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206
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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 ...
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1
answer
10k
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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?
...
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2
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1
answer
1k
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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 ...
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3
answers
6k
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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 ...
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2
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1
answer
3k
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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 ...
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1
answer
2k
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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 ...
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3
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3k
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Connecting SIM900 to STM32F4 Nucleo
I'm trying to connect Simcom SIM900 to Nucleo-F411RE using the following configuration for USART1:
...
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1
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695
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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.
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1
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1k
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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 ...
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1
vote
1
answer
221
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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 ...
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2
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1
answer
8k
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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 ...
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1
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745
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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 ...
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