Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [sim800]

21 questions
3
votes
1 answer

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 have noise. The signal on UART2 RX looks clean.…
Sandre
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3
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1 answer

SIM800L AT+CSQ return 0,0 when SIM is inserted and 20~40 when I insert the sim

I have SIM800L module, when I try AT+CSQ it returns 0,0 when I tried to remove the sim and try again it returns number, 0 (25,0) and I cannot register to a network so AT+CREG? returns 0,2 should I activate something or do another command before…
HSLM
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2
votes
2 answers

SIM800L V2 not responding to AT Commands from Putty over USB-To-TTL PL2303

My SIM800L V2 RoHS (the blue one) although it connects to the network and registers just fine, it's not responding to AT commands sent over the PL2303 (USB-STC-ISP) USB-To-TTL Adapter through which it's hooked up to the PC, I used multiple Serial…
sMooDi
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1
vote
0 answers

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 communication with the Chip is the question. I…
Erkman
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1
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0 answers

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 infinite restart mode. I would like to know if…
Laila Elkaddar
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1
vote
0 answers

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 module if I connect its Gate to an Esp32 gpio with…
DJDB999
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1
vote
1 answer

SIM800L power switching with transistor

I use a TIP32C transistor to switch the power line of a SIM800L module, but unfortunately this method isn't working. The module is powered on, but it only blinks once every second instead of every 3s. If I connect the power pin of the module to Vcc…
DJDB999
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0
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0 answers

SIM800L GSM module humming noise

I am trying to play audio over the call by using SIM800l I am using this "DFPlayer mp3 module" to play audio and connected its AUDIO OUT to the MIC IN of "SIM800L GSM module" and I hear a humming noise. I tried to put those capacitors as in this…
Mohamed Essam
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0
votes
0 answers

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 nothing. i use the AT+command "AT+DDET=1" to…
Mohamed Essam
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0
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0 answers

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 doesn't work and I always receive a "+CREG 0,0". Using the…
ANTONIO EMILIO PEREIRA
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0
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2 answers

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. However, I want to use a portable power supply…
electronix0
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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 SQLite database. So, the device is constantly turned…
BelKed
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0
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0 answers

Interface PCM module SIM800 , SIM808

I am planning to use a SIM800 or SIM808 GSM/GPRS module's PCM interface. I configured the circuit according to the datasheet. I send the 256 kHz clock from the micro to the PCM_CLK pin of the module and apply the following commands to set the PCM to…
ASHKAN
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0
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2 answers

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 sensor I want to power all this using 4 or 6 AA…
dracarys
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0
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0 answers

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 Setup method, the SIM800L can't receive an SMS. Ethernet.begin(mac, ip, gateway,…
vito
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