Questions tagged [sim800]
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24 questions
2 votes
2 answers
182 views
What is this white SMD component on a SIM800L red module (DIY low-cost version)?
SOLVED (The bottom of the page is where you can find the conclusion.) THE QUESTION: Does anyone know what this white component is, and what its role is in the SIM800L module circuit? Thanks in advance!...
- 31
0 votes
1 answer
143 views
Why doesn't my sim card module with ESP32 connect to network?
After countless hours trying to configure my ESP32 Wrover to communicate with my SIM800L V.2 module I can't find a solution to it failing to connect to the internet. The IoT SIM card from 1NCE is ...
- 11
0 votes
2 answers
102 views
Some characters lost in UART Transmission (PIC12F1822 -> SIM800L)
I am using the diagram recommended in the SIM800L datasheet to connect it to a PIC12F1822 MCU operating at 3.3V and 16MHz using its internal RC oscillator. ...
- 299
1 vote
1 answer
154 views
How to simulate a finger touch electrically to remove noise
I am working on a project with "SIM800L" GSM module, the problem is that there is a noise from the module in the calls and it disappears when I touch the module's body with my hand. Kindly, ...
0 votes
0 answers
474 views
Sim800L can't send SMS
I know it is somehow weird problem, but I don't know what to do. I am using SIM800L GSM module with ESP8266 nodemsu v3 and they are connected via UART serial communication. I am using this code to ...
0 votes
0 answers
301 views
Can't get DTMF tones from sim800L gsm module
I am using esp8266 and sim800L gsm module to recieve incoming call and get the DTMF tones from the caller and take an action according to the received number, i am searching for about 3 days and found ...
0 votes
0 answers
150 views
SIM800C not working as expected
I've created a custom board with a SIM800C. I'll show the schematic above: My VIN is aproximately 4.8V. MY "4V" line is constant. I'm able to comunicate with the module, but sometime's ...
0 votes
2 answers
975 views
SIM800L external supply issue
I have built an Arduino project that sends data from sensors to a specific website using the SIM800L GSM module. My problem is when I power whole circuit it from a computer or a charger, it works fine....
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
2 votes
0 answers
94 views
SIM900A: Network depersonalization required
I have made experience with sim 800l, it works like a charm. Now I got a new SIM900A module, interferencing it with (RP over python), AT command returns ok, and other basic AT commands, so not the ...
- 21
3 votes
1 answer
641 views
STM32F401 UART noise
I have device with an STM32F401 and a SIM800L. When the SIM800L sends data I have noise (usually 1 byte) received by the STM32 on UART2 connected to the SIM800. If I use FTDI instead of STM32 I never ...
- 131
0 votes
2 answers
512 views
Guide for power supply for ATMega328 and SIM800L project
I am creating a data logger that uses: ATMega328p - microcontroller SD card module to read and write data SIM800l - modem to transmit data from SD card to API OLED I2C display DHT22 temperature ...
- 121
0 votes
0 answers
264 views
How to combine SIM800L and Ethernet shield in one program?
I'm trying to use a SIM800L and Ethernet shield in one program. Separately they work perfectly, but they do not work together. When I put the following code in the ...
- 111
1 vote
0 answers
2k views
Send data to MQTT broker using SIM800 and ESP32
I'm working on a project in which I need to send data to an MQTT broker installed on a Raspberry Pi. I refer to the tinyGSM library and this tutorial along with this example. The ESP32 remains in ...
1 vote
0 answers
238 views
Gate of Logic level MOSFET connect to Esp32 gpio
I want to use IRLR024N logic MOSFET to switch on/off a Sim800L module. This module consume 2A for 500μs and then consume only 200mA. I supply this module with 4V. This MOSFET able to switch on this ...
- 77