Arduino Stack Exchange
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Questions tagged [sim800]

17 questions
3
votes
1 answer

How to send 0x1A as data via TCP on SIM8xx?

I am using a SIM868 module with an Arduino Mega, where the SIM868 is connected to Serial1. After establishing a TCP connection, I need to send the following byte stream: {0x60, 0x1A, 0x9D, 0x01, 0x00, 0x00, 0x07} I am attempting to send this data…
Shekhar Saha
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3
votes
0 answers

Sim800l doesn't respond to AT commands

My SIM800L doesn't respond to AT commands. The serial monitor is simply blank. And the led blinks every 3 seconds which means it is connected to a network I power it through an LM2596 buck down converter with 4.0 v (I've tried to power with voltages…
Ângela Sulissa
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1
vote
1 answer

AT command validation does not appear on the serial monitor

I can't validate an AT command. Would anyone have any suggestions as to what I might be doing wrong? It should be printing "Sending successful! or "Sending failed!", but it doesn't show any text. if (httpReadResponse.indexOf("OK") != -1) { …
Fabio Henrique
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1
vote
0 answers

How to set SIM800L to save messages to memory and reading them

I have so many commands that i need help to setup my SIM800L module. Tutorials i have seen so far involves the messages going directly to the mCu this is problematic for me because if the mCU is currently bussy doing something as of the moment and…
DrakeJest
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1
vote
0 answers

ESP Sim800l Firebase

So, I'm trying to send data from ESP boards- 32 and 8266 using sim800l module to firebase. But I'm getting HTTP not connected error. I tried to search web but it seems that firebase changed something recently and the ways previously used cant be…
Kuldeep Aher
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1
vote
0 answers

wemos d1 mini keeps resetting while using SIM800L

I am trying to do a small project with SIM800L with Wemos d1 mini. It is a DTMF based project. The problem here is, every time I make a call the d1 mini is getting reset. This is my first project with d1 mini. For the past few days I have googled,…
S.k.joy
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1
vote
0 answers

ESP32 - SIM800 - HTTPS lwIP

I am using ESP32 and SIM800L for my project. The SIM800L does support SSL, TLS 1.0, and TLS 1.1. But web servers nowadays usually support only TLS 1.2 and 1.3. I heard, that the ESP32 HTTPS client can use lwIP stack from other libraries. Is there…
rktech
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1
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0 answers

Getting location working on SIM800L with TinyGSM?

Hey Arduino enthusiasts :) I have purchased a LilyGo T-Call board. Which has a Esp32 processor and a SIM800L GSM module. For my project i want to send location data over the 2G cellular network. I am using the TinyGSM library for communicating with…
kasper.jha
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1
vote
0 answers

How to correctly use SSL certs with the Adafruit SIM800H

I am trying to use a Adafruit Sim800H to connect to Azure using MQTT with an SSL certificate. My first step is trying to put a new SSL certificate onto the board. To do this I am using this example here: https://github.com/vshymanskyy/TinyGSM/ ...…
Andrew
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1
vote
2 answers

800l v1 Baud rate is not fixing at 115200, How fix it for 115200 for lifelong

I am trying t change the baud rate of sim800l v1. But not successfully happening, every power cycle again going to AT+IPR= 0. I am using the following AT commands for changing the baud rate. 1.AT 2.AT+IPR? 3.AT+IPR=115200 4.AT&W after power…
SWARNA MOHAN CHANDRA KANTH
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1
vote
0 answers

Error Performing HTTP GET request on google sheets (Apps Script) using TTGO T-CALL

I've tried using several libraries such as TinyGSM, SoftwareSerial, AT commands but I'm guessing the problem to be with my GET request url is https://script.google.com/macros/s/GAS_ID/exec?tag=1234&value=5678 and the Apps Script code is function…
Anonymus
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  • 1
0
votes
1 answer

sim800l gsm module response isn't completed

I am using the sim800l gsm module with nodemcu esp8266 and comunicating with it using AT+ commands. The module is working correctly but I am trying to use the command AT+CLCC to get all the current calls' state but it responds with only the first…
Mohamed Essam
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0
votes
1 answer

SIM800L stays in 1sec-blink-state

I've bought such on Amazon. My main problem is that it stays in 1sec-blink, meaning it can't registrer cellular network. First I tried with all anntennas possiblities (one of each, both, none) - failed. Using NodeMCU (for 3.3 TxRx) and…
guyd
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0
votes
1 answer

sim800l ftp error after http request

I am using esp32 CAM by Arduino IDE and send an image file by ftp using SIM800l GSM/GPRS module to a server and every thing is ok . I can perform http request also and read some data from a website and every thing is ok. Problem is ftp for large…
Ali
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-1
votes
2 answers

Is my SIM800L module burned?

I have troubles with powering my SIM800L module. When it was powered from Arduino board using LM2596 DC/DC step-down converter (which is used to lessen voltage to 4.1V), the module restarted every 10 seconds. I have decided to power it up from 9V…
canary44
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