Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [simcom]

32 questions
5
votes
1 answer

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 "Registration Denied" (+CREG: 3) and the device will…
skot9000
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3
votes
1 answer

SIMCOM vs UBLOX

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 for Ublox modules because they are…
user150963
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2
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1 answer

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-assisted mode), I receive the following in…
user1995565
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2
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1 answer

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 supposed to, some commands fail when I try to execute…
Trevin Corkery
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1
vote
0 answers

Simcom SIM7000G module with its UART TXD pin always in level 1

I have developed a very simple module board based on SIM7000G to be used in the LAB of the company to make fast PoCs (proof-of-concepts), I know the schematic and layout of this board is very far from something very good or "ideal", but anyway I…
abomin3v3l
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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. However from time to time I stop getting updates. I…
Naveen Gupta
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0 answers

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). At one point yesterday we experienced a failure…
JRB
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1
vote
1 answer

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 code works but only when I reset the board after…
salar1991
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1
vote
1 answer

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 ESD clamping characteristics graph. But first…
cbagusjk
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1
vote
2 answers

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 gsm module wants to send data. I tried to lower my…
Alireza
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1
vote
3 answers

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 to receive any kind of answer from the module. I…
user362759
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1
vote
2 answers

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 powered mcu. My problem is,sometimes not…
Alireza
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1
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1 answer

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" according to manual. HTTP POST works fine on all…
rostokus
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0
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0 answers

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 inability to handle both tasks simultaneously,…
Santiago Mercante
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0
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0 answers

SSL AT command issue after switching from SIM7600EI to SIM7600 CE,

I had a simple application which POSTs a JSON payload to an API endpoint, running on an STM32 controller with SIM7600EI as the modem. Shortage of SIM7600EI in the market forced me to switch to 7600CE which is pin by pin compatible with the former. I…
nottherealfaraday
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