Arduino for STM32

Hi!
Everything works! :)
I use logic level converter, and try work whit SIM module using 5v logic.

TLL -> 5V
RX 3.3V (STM) -> LLC ->TX 5V (SIM)
TX 3.3V (STM) <- LLC <-RX 5V (SIM)

Most likely, there was a problem with TTL on the SIM module, and correctly work only 5V logic.

Thank you all ...

You may also check the power supply. GSM module can take 2A peak current during transmission, especially during the network search. As stated in the datasheet you need large value capacitors connected at the power supply. Not sure if your Arduino board has a bigger capacitor than your STM32 board ...

fpiSTM wrote: Wed May 12, 2021 3:12 pm Seems this one:
https://www.amazon.com/Comimark-SIM800C ... B07WXPTW26

So 3.3V should be compatible.
Maybe look around the flow control. As stated before I would test the SIM800 alone.

Ok, thanks.
I connect to STM only SIM Module and test.

Fine to see some stuff work.
For the modem issue, I would try the modem alone first.
The fact it works on Uno can be related to the voltage level. Uno is 5V while STM32 is 3.3V even if several GPIO pin are 5V tolerant.

Do you have a link to the module you used ?
or maybe a pins conflict a ...

First the link to the wiki: https://github.com/stm32duino/wiki/wiki/API#hardwareserial

For Serial menu, basically your sketch uses the default Serial instance which is mapped to one U(S)ART.
Seems you used the BLACK F407VE, the default Serial is PA10/PA9 which use UART1 so the Serial instance is ...

Hi
First I advice to test only GSM with the STM32.
Then I know several GSM library uses the software Serial library. STM32 core provide it for compatibilty but often do not work as too much time consuming. Originally this library was developed by Arduino as a "workaround" for mcu with limited ...

Hi!
I have some problem with GSM SIM800C V2.
I don't know why but STM didn't send any data.
GSM work correctly (I check it using Arduino Duo. I call and everything works fine)
GPS and other stuff works fine.
Maybe some one can help me?

Core https://github.com/stm32duino/wiki/wiki/Getting-Started ...

Heh
They work.
I don't know how but they work.
I just steamed the SDA and SCL outputs.
I know it's wrong but it work.
https://drive.google.com/file/d/10n4UB7 ... sp=sharing
Thanks Everybody. For now, that will be enough.

10 DOF IMU Sensor (D) didn't work.
I try connect too Arduino Duo but gyroscope and accelerometer don't work and I think I dont need them.
I replaced it with a QMC5883L I2C GY-271.
BME280 works correctly but QMC doesn't.
I connect QMC to PB6, PB7.
I use this pinout shem.
https://os.mbed.com ...

Here is a nice picture of the data lines without pull-up resistors: https://electronics.stackexchange.com/questions/524698/stm32-i2c-do-i-need-external-pullups . With the right pull-up, the signals are nice and square.

I will try use pullups)).
I turned off the screen sensor and everything ...