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Questions tagged [simcom]

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SIM7080G MFF2 SIM not detected

I have designed and assembled a custom PCB with ESP32 and SIM7080G LTE-M modem, basically an IoT weather station. SIM7080G datasheet Everything works fine except for a very important part that renders ...
Reicken Back's user avatar
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75 views

Managing AT Commands for SIM COM A7672S SIM Module - Header Appending Issue

I'm currently working with the SIM COM A7672S SIM module to download a file in chunks from an Amazon S3 server. I am using the AT command 'AT+HTTPPARA="USERDATA","Range: bytes=0-1023&...
cyber122010's user avatar
1 vote
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21 views

RF verification for SIMCOM7070 modem

We have a custom board featuring a SIM7070 modem with two SMA connectors for GSM and GPS. After fabrication, the boards are passed through some basic tests to check if the device can operate as ...
BvLeeuwen's user avatar
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29 views

Sim7600 TLS data buffer size?

I use sim7600 module's TLS layer to connect the Azure IoT hub. I have problem with tls buffer size, which is 2kb(as datasheet says). It acts unexpectedly when i try to receive message more than 2kb in ...
shota tchilaia's user avatar
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30 views

Why am I getting incomplete geolocation data for long periods of time using SIM7070g?

I'm facing a problem while working on a tracking application using the SIM7070G module for GNSS data. The application alternates between sending data and retrieving GNSS coordinates due to SIM7070G ...
Santiago Mercante's user avatar
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1 answer
352 views

Sending/receiving a continuous stream of data using SIM7600

I have a SIM7600EI connected to an STM32 controller over UART. I am able to send HTTP POST requests for small chunks of data using AT commands. Currently, I want to send a continuous stream of data ...
nottherealfaraday's user avatar
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34 views

SIMCOM SIM7000G power supply design testing LTspice

According to the datasheet SIM7000 _Hardware Design_V1.05 in section 3.1 Power Supply, On VBAT pads, when module works on EDGE or GPRS mode, the ripple current is up to 2A typically. For steady ...
Mohammed Mubarak's user avatar
0 votes
1 answer
174 views

Using an active GPS antenna in the SIM868 module

Is it better to connect to VBAT or to VDD_EXT in the SIM868 module to supply the active GPS antenna voltage?
feri's user avatar
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How to find Vendor ID and Product ID of Sim900a

I have been trying to get my Sim900a detected on my Ubuntu. In order to follow the instructions of SIMCom here and here, I need its vendor ID and product ID to be put into ...
Thermal_insulator's user avatar
1 vote
1 answer
176 views

SIM7080 UART Noise interfacing with PIC18F4550

I'm working on a project where I read data over Modbus line and send it in the cloud service through a SIM7080 CATM modem. I'm using PIC18F4550 as MCU. As that PIC18F has just one UART module, I'm ...
andradecaio's user avatar
1 vote
0 answers
572 views

Help with troubleshooting SIM 7600 with arduino for HTTP GET requests

I have got SIM7600 working with Arduino to update GPS coordinates obtained from UBLOX M8N to a custom URL using http get requests. My code works fine and I am able to track the GPS coordinates. ...
Naveen Gupta's user avatar
2 votes
1 answer
2k views

Assisted GPS (AGPS) on SIM7600 module does not work

I recently got a SIM7600G breakout board and wanted to use it with the CGPS functionality for A-GPS. It works with connecting with my SIM to the Internet and all, but when I try to use AT+CGPS=1,3 (UE-...
user1995565's user avatar
1 vote
0 answers
193 views

UART IO not working, placed multimeter to measure voltage and IO began working instantly - why?

We are a bit stumped on this and wanted to see if anyone had any experience or perspective on this. Description of Event We are communicating via UART from a 3.3V processor to a Sim7000G (1.6-1.8v). ...
JRB's user avatar
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1 vote
1 answer
157 views

SIM808 freezes after one SMS using STM32

I am trying to design a GPS car tracker with a SIM808 module using a STM32F103RET6 header board. I want to get the location link messaged to my phone by sending an SMS to the module. Right now, my ...
salar1991's user avatar
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229 views

Putty won't allow me to type. Can only type the letter 'A'

I connected a SIM7605CE module to the PC (Image shown below). I downloaded and installed all the necessary firmware for the device. I connected the device to a 5V DC power supply and connected it to ...
C Vith's user avatar
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1 answer
206 views

Are there regional constraints with the SIMCom modules? (Eg. SIM7605CE/SIM7600CE)

I recently received a SIMCom Module (Model no. SIM7605CE), shown below. The item can be (purchased online as well). The device, much like the ones used with Arduinos (like the SIM800L), is supposed ...
C Vith's user avatar
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Why I've weak Bluetooth signal with Sim800C and how to strengthen it?

I've designed a circuit and used SIM800C module to work with its standard Bluetooth and GSM module. GSM works well, but its Bluetooth has weak signal, which I've to stick my phone to the board. In ...
Davoud's user avatar
  • 101
2 votes
1 answer
2k views

SIM7600A gives an error when executing commands, but works after executing it again

I am currently using a WaveShare cellular modem hat for my Raspberry Pi. The module has an onboard SIM7600A. I've been reading the documentation and although all the commands work as they are ...
Trevin Corkery's user avatar
1 vote
1 answer
214 views

ESD clamping voltage in SIMCard interface too high

I planned to use SIM868 and what makes me confused all this time while choosing ESD protection is the voltage after clamping the transient voltage, it is still way too high especially when looking at ...
cbagusjk's user avatar
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108 views

Send data over server from microcontroller

How large chunk data of data is send over internet using GSM module or ESP from some kind of microcontroller. As they both have a limit of data sent by TCP so how is it done and what is used to ...
Electro's user avatar
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1 answer
118 views

SIM7000E modem stops sending SEND OK reply

I am using a SIMCOM SIM7000E modem to send data using MQTT. Usually modem reply correctly to AT+CIPSEND command and sent ">" to enter the required data and then reply with "SEND OK&...
HKP's user avatar
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1 answer
847 views

SIM868 powers down after few seconds

I designed a circuit with SIM868 module, and i followed the recommendation from datasheet to unsure suffusion current. The main power supply is getting from VCC:12V source converted to 5V by an DC-DC ...
Hakraf's user avatar
  • 3
1 vote
2 answers
3k views

stm32f107 uart frame and noise error

I made a device with a stm32f107 and sim800l gsm module . Module is in data mode(PPP) and I'm using LWIP library . My MCU clocks at 72MHz . My problem is that I get frame error and noise error when ...
Alireza 's user avatar
1 vote
3 answers
2k views

STM32F4 and SIM800L logic level

I am currently using an STM32F401RE that I have to interface with a SIM800L GSM module via UART. In a first "toy example" I used Arduino and found no problems, but passing to the STM MCU I am unable ...
user362759's user avatar
1 vote
2 answers
642 views

Mcu keeps reseting because of noise

I have a circuit in which there is a mcu lpc1768 and a gsm module sim800l. For power I use DC/DC converter and made a 4.2v using lm2576 for sim800l. Used that voltage, I made a 3.3v using ams1117 and ...
Alireza 's user avatar
1 vote
1 answer
649 views

SIM800C returns +HTTPACTION: 1,602,0 during HTTP GET

I have several boards with SIM800C GSM module. One of them works correctly when I issue HTTP GET request (returns HTTP 200). All other boards returns HTTP 602 all the time. 602 stands for "No memory" ...
rostokus's user avatar
5 votes
1 answer
2k views

SIM808 registration denied for new SIMs

I have a SIMCom SIM808 2G GSM module on a custom PCB based upon the Adafruit FONA. I got a bunch of 2G SIM cards from Aeris.net. The problem is when I first put the SIM cards in my device, I get "...
skot9000's user avatar
  • 113
0 votes
2 answers
447 views

SIM808 always returns the same temperature

I have a SIMCom SIM808 module built up on my own breakout board. Whenever I query the temperature I get back the exact same temperature, 24.11 (deg C) despite the actual temperature in the room ...
skot9000's user avatar
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0 answers
1k views

Enabling SD card access on SIM808

I am currently working with SIMCom's SIM808 2G+GPS modem. In my setup, an MCU communicates with the modem over UART to save some data in the SIM808's filesystem. As the modem's built-in memory is < ...
Karzon's user avatar
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0 votes
2 answers
4k views

Can't reduce SIM808 Power Consumption

I bought a SIM808 module to use it with a PIC microcontroller. Everything works great but now I'm trying to reduce the module power consumption. The module I have is this one from DFRobot. When the ...
Andres's user avatar
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3 votes
1 answer
2k views

SIMCOM vs UBLOX [closed]

I would like to know what are your thoughts on the following below. I am designing a GSM tracking device with a SIMCOM808 module and I am speaking to an antenna supplier that advises me to rather go ...
user150963's user avatar