Questions tagged [sim900]
GSM/GPRS module from the manufacturer SIMCom
62 questions
0 votes
0 answers
94 views
Simcom A7683E - hand free design taken from SIM900
I'm trying to design hand free audio for A7683E. The funny thing is Simcom website without any docs for this module. I decided to use this module as a replacement for a great SIM868 (but the downside ...
0 votes
0 answers
200 views
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 ...
- 1
0 votes
1 answer
116 views
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
1k views
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. ...
- 397
0 votes
1 answer
310 views
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 ...
- 71
-1 votes
1 answer
194 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
1 answer
158 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, ...
2 votes
2 answers
2k 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 ...
- 23
0 votes
1 answer
3k views
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 ...
- 59
0 votes
2 answers
4k 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 ...
- 1,864
0 votes
1 answer
756 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 ...
- 2,228
0 votes
4 answers
14k views
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 ...
- 23
0 votes
0 answers
392 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 ...
- 229
0 votes
1 answer
2k 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 ...
- 101
1 vote
3 answers
966 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 ...
- 337