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Questions tagged [sim800l]

46 questions
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Sending sms via GSM SIM800l module and stm32

I am trying to use gsm module with stm32 to send sms. Which gsm library should I use? How can I write a simple code for sending sms via sim800l module ? Or is there a simple working example of this project? Can you suggest something working?
Aster
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SIM800L: Convert Network time to string for SMS content

Good day Everyone, I have a project where each event is time-stamped, and the timestamp is added to an SMS and sent for recording. I have been able to retrieve the time from the SIM800L Modem, and when I do the following: int time =…
Michael Havenga
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Sim800l Receives Sms but Show unknown numbers, Hardware is just fine

I'm trying Sim800l and ESP8066 As my serial communication to Mega r3. when i try sim800l code side, something like this: which i refined the code a little bit. In Serial monitor handshakes are ok. but when new sms arrives it doesn't show the right…
maryam mohammadbagheri
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How to manage firebase by URL

Good night. May someone help me? I'm trying to upload data throught arduino and SIM800L to firebase, I have seen one tutorial in github but It didn't work for me, I have done a code to upload data to thingspeak db and it works with url using get…
Camilo
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How does my ESP8266/NodeMCU communicate with my GSM Module SIM800L?

so I want to connect my SIM800L GSM Module to my NodeMCU. I bought a LM2596 DC-DC voltage regulator to convert the output voltage to ~4V for the SIM800L. Input voltage for the regulator is 9V/1A. Everything is connected: RX from GSM to D5 (GPIO14),…
kfar3991
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SIM 800L cannot connect to at

I am trying to send some data using the sim800l module. I am using the SoftwareSerial library and connected the RX and TX pins to Digital pins 10 and 11. I have also tried pins 2 and 3. The module is connected to a 5v power supply and the only pins…
Silviu Babescu
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is there a way to modify SparkFun_MS5803_I2C .cpp /.h to allow user defined (non-default) I2C SDA/SCL pins for use with TwoWire?

I am using a ESP32-SIM800L with GPRS / MS5803-14BA / BME280 / SH1106 OLED The modem and sensor setup (using TwoWire ) is as follows (relevant extracts only): #include ... #define I2C_SDA 21 #define I2C_SCL …
user3306881
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Sim808 with Mqtt (AT+CIPSEND)

i am using Sim808 GPS Module to send lat-long and using MQTT to send it to subscriber. I followed tutorial from here to publish MQTT message over Sim808 but still no luck. Here is my sample code: def cmd(cmd, ser): out = b''; prev =…
Panji Setiawan
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Program is executing but AT commands not showing in serial monitor

My purpose was to send SMS using GSM SIM800L coreboard and Arduino UNO. Here is the code #include //Create a software serial object to communicate with SIM800L SoftwareSerial mySerial(3, 2); //SIM800L Tx & Rx is connected…
Udara Sampath
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Arduino UNO - SoftwareSerial limit too low

I am using arduino UNO board, with modem sim800l. I want use it to send data to server, but the problem is that my url gets truncated. I tried to overwrite the default limit of this library before and after I include it but I get the same…
Cristina Lupu
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Arduino UNO & Modem Sim800L Can't write setup commands to send data to server

I am using arduino UNO board, with modem sim800l. I want use it to send data to server, but the problem is that I can't write the setup commands. What am I doing wrong? Are not this the right commands to use for sim800l? I've tried with different…
Cristina Lupu
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Sim800l: how to know network state reliably

In Sim800L AT-Commands Guide there are a lot of different status commands, that should tell, what state does is have. For example: AT+CPAS - check if device is ready AT+CGREG? - check registration status in network AT+CGATT? - check if device…
MihanEntalpo
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when i try send sms in sim800l with at+cmgs i have got error

hi it is my code to send "hello world" to my phone number with ardiuno and sim800l but i get Error and when i use "gsm.println("at+cmee=1");" i will get cms error 305 what is your suggestion to send normal sms with ardiuno and sim800l? void…
hesam sadig bayan
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Does sim800l has an url limit?

I want to send an information to web server with arduino via sim800l. AT+HTTPPARA=\"URL\",\"http://api.trackers.live/v3.0.0/TRCKR02B2AF359D19/40.35715122342342322432-36.077406243242342-1469134234/1212/021/16553" When I want to send long url to web…
Furkan Altay
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Sim800l save input as a string

I'm trying to save my received SMS into a string but it doesn't work. This is my error message : recive_0_1:50:28: error: invalid conversion from 'int' to 'char' [-fpermissive] exit status 1 invalid conversion from 'int' to 'char' [-fpermissive]…
meital
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