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Avtandil Socks
Avtandil Socks

Serial Communication With Gsm Modem Sim800


Build Web Server projects with the ESP32 and ESP8266 boards to control outputs and monitor sensors remotely. Learn HTML, CSS, JavaScript and client-server communication protocols DOWNLOAD




serial communication with gsm modem sim800



Hi Sara,Thank you for the amazing tutorials,I want to send an image from esp32cam to webserver via post method. When I use Wi-Fi like your very good tutorial in -cam-post-image-photo-server/#::text=Go%20to%20Tools%20%3E%20Board%20and,CAM%20on%2Dboard%20RST%20button. , it works without any problem, but the same code does not work when I use sim800L and Tinygsm when it connected to gprs and I get response code -3. I would be grateful if you could guide me, or if you have any experience in this field, please let me know.Thanks


For some unknown reason, the rule that converts these modems from storage devices into serial devices may not run automatically. To work around this problem, follow the procedure below to change the modem mode and (optionally) create udev rule on a configuration USB stick for the device to switch to serial mode persistently.


The following table lists some common AT commands that can be used to quickly and easily detect whether the SIM800C's AT serial communication and network connection are normal. Before following the steps of the network communication demonstration described in the table below, it is recommended to do a simple network test to confirm that the target network connection is normal and operable.


Jetson Nano has an onboard 40Pin GPIO interface, SIM800C GSM/GPRS HAT can be directly connected and used, and Jetson Nano's terminal access serial port does not affect the serial communication with SIM800C GSM/GPRS HAT (ie Pin10 and Pin8).


The SIM800L is a micro SIM low cost GSM/GPRS Development Module. The Module supports TTL communication and hence can easily communicate with Microcontrollers without the need of additional data converters like MAX232. The module also supports antenna with IPX connector.


This is widely happen problem - serial communication with SIM800L stopped working.You can do reset, but in my case it didn't help: on powered SIM800L module shortcut "RST" pin with the ground for half of second - unit should reset and restart. I think it's defective architecture/firmware, but unfortunately SIMCOM dropped support for this model, so best advise is to avoid SIMCOM until they study how to make quality products.


Long Answer: We cannot develop for each and every microcontroller out there in the market. All you have to do is communicate with the module serially. We are sharing the Arduino code because the Arduino ecosystem is beginner friendly and easy to use. And there is less likely to get any error even if you copy paste the code that we provide. But in the case of other microcontrollers this is not the case. However, you can get sufficient help from avrfreaks forums.


i would try to interface the sim800L gsm module to arduino UNo but the signal was not available and i tried with 4 gsm modules the signal was not available and i used strip Antenna, GSM Antenna and i also resistors connections also still it was not working please help to to get signal for this modules thank you


This module uses GSM technology and it connects to the Internet, sends messages or makes calls using that same technology. GSM is a network technology mostly used for mobile communication. Within the GSM network, there are several units that enable communication jointly: the mobile station (our GSM module or mobile phone), the base station subsystem, and the network subsystem. The mobile station (MS) consists of a GSM device and a card known as the SIM card. The SIM card is device-independent, which means that the SIM cardholders can use GSM services on any device using their SIM card. It contains an IMSI number that identifies the user to the system. The mobile station connects to the nearest base station (transceiver) and exchanges data with it. The base station subsystem consists of a base transceiver station and a base station control section, but it also contains transceivers that are connected to mobile stations. The network subsystem contains a mobile service switching center that works like a regular switching node and registers users, authenticates, directs calls, etc. This system consists of several units that perform all the necessary functions and further connect to a fixed telephone network.Our module is a mobile station that contains a SIM card and takes care of connecting to the base station, while it communicates with Croduino via serial communication and uses the AT commands using which we control the module.


The module uses only 2 pins as it communicates via serial communication. Since we use serial communication and pins 0 and 1 to communicate with our computer and to program our microcontroller, we need to use the SoftwareSerial library and the pins we define ourselves to communicate with our GSM module. To power the module, we must use an external power supply because Croduino cannot deliver the amount of current required by the module. The module can max up to 2A of current while connecting to the Internet, so we need to use the power supply that can provide as much current. For the power supply, we must make sure that the voltage does not exceed the value of 4.4 V and that it is not below 3.7 V, and to achieve this, we can use a step-down converter which we will adjust to 4.2 V. We can power supply the module using the LI-po battery whose rated voltage is 3.7V and the maximum voltage of a fully charged battery is 4.2V which is below the maximum module voltage. The scheme that uses the battery for power supply and the scheme that uses the source with a step-down converter is shown in the images below. The serial communication pins used in the schematics and in the example code are 9 for the RX line and 10 for the TX. Since the module is not 5V tolerant, the RX line is connected via a voltage divider, which is made up of 10 kOhm resistance and 5.6 kOhm.


  • Code-wise, the outcome of this conversation was to invoke the listen() method before doing any communication with the modem. github.com carrascoacd/ArduinoSIM800L/blob/85180b7b4fd72643b98d387177197d772de0fca5/Sim800.cpp#L86-L93void SIM800::sendCmd(const char* cmd)

  • serialSIM800.listen();

  • serialSIM800.flush();

  • delay(500);

  • serialSIM800.write(cmd);

  • serialSIM800.flush();



SIMComSIM800(Stream* modemStream, int8_t powerPin, int8_t statusPin, int8_t modemResetPin, int8_t modemSleepRqPin, const char* apn)Construct a new SIMComSIM800 object The constuctor initializes all of the provided member variables, constructs a loggerModem parent class with the appropriate timing for the module, calls the constructor for a TinyGSM modem on the provided modemStream, and creates a TinyGSM Client linked to the modem.


Are you using the EK-TM4C123GXL launchpad for your development or do you have a custom board? If you have not already done so, please download and install the TivaWare library and Code Composer Studio. Have you designed your hardware interconnection yet? You will need to select one of the UART ports to connect to the SIM800l module. Take a look at the example in your TivaWare folder: "C:\ti\TivaWare_C_Series-2.1.4.178\examples\boards\ek-tm4c123gxl\uart_echo". You will need to modify this example to use the UART you connected to the SIM800l module. (UART0 is already used by the EK-TM4C123GXL to connect to a virtual serial port on the PC.) You will also need to modify the baud rate to something lower than 115200 if autobaud is enabled. (57600 should work.) Then of course you need to modify what is sent by changing "\033[2JEnter text: " to "AT", and what you do with the response in the interrupt routine.


hi sir,I want to send some data to server via GPRS modem with Pre shared keys ,I am using PUTTY terminal.How to setup TLS connection with Pre shared keys.?.please help me with this.. -data-with-pre-shared-keys-to-server-via-sim800a


SIM800L GPRS GSM Module Micro SIM Card Core Board Quad-band TTL Serial Port breakout board is based on available for GPRS and SMS message data remote transmission. The board features compact size and low current consumption. With the power-saving technique, the current consumption is as low as 1mA in sleep mode. It communicates with the microcontroller via UART port, supports command including 3GPP TS 27.007, 27.005 and SIMCOM enhanced AT Commands. The serial port is a TTL serial port, which can be directly linked with the MCU. Module power-on automatically starts, automatically finds the network On-board signal indicator (slow signal flashing, no signal flashing)


SIM800L GSM/GPRS module is a miniature cellular GSM modem from Simcom, which can easily interface with any microcontroller to give the microcontroller GSM functionality, and allows for GPRS transmission. This module connects the microcontroller to the mobile network to make or receive phone calls, send or receive SMS (text messages), and connect to the internet using GPRS, TCP, or IP. Another advantage is It supports quad-band GSM/GPRS network, which means it can work anywhere in the world. These important functionalities as well as the low cost and small footprint make this module more perfect for any project where long-range connectivity is required and also it can be integrated into a great number of IoT projects.


OLIMEXINO-NANO-GSM is a GSM/GPRS/Bluetooth 3.0 shield for OLIMEXINO-NANO with the SIM800H quad band module. It allows OLIMEXINO-NANO to perform GSM data calls (act as GSM modem), to send and receive SMS and to send and receive GPRS data and to connect to Bluetooth 3.x devices. This module has an external antenna connector for the 3.0+EDR GSM and PCB antenna.


There are two ways of connecting the GSM module to Arduino. In any case, the communication between Arduino and GSM modules is serial. 1. Without SoftwareSerial Library2. With SoftwareSerial Library


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