Arduino for STM32

I thought IRF7103 for 3.3V control is not a good choice. Thanks for the hint with the AO3400A transistor. I checked if it is available where I live (aliexpress is stopping the project for 1-2 months), I found it. I also found AO4800, it seems to have exactly the same pin distribution as IRF7103 ...

I have used this solution for many years:
IRF7103.png
IRF7103 is controlled from the Nano v3 or Mega2560 pin with 5V voltage and PWM signal.
Mosfet does not heat up and I have no malfunction. They control 6W LED lighting per channel.
The scheme is simple, the layout is small and has few elements ...

Thanks for the clarification. I have no experience with STM32

fredbox - this is what i was looking for. Thank you for your help. Pstring is light and secure against buffer overflow.

In my program I have to convert the Float variable to String. I know two methods in Arduino. I was surprised by the memory consumption needed for this! Summary of my tests:
1. STM32F103C8, Official core 1.9.0 Compilation of an empty sketch.
Flash 9760 (14%), Ram 820 (4%)

2. STM32F103C8, Official ...

Ok, so I can stay with Roger's core + RadioHead for F104C8 for now. ST-LINK reads that I have 128k Flash, even though it's C8 :) Can I use all 128k memory? If so, I have the perfect platform for my project.

The second option is to use RadioLib + Official Core. I was looking for a solution in the ...

Thank you for your reply and information. Of course I will check the STM32 Cube Programmer + Stm32CubeProgrammer (SWD).

Regarding the sketch, which with Roger's core compiles and works well on the board, if I set the official core:
- Generic SMT32F1 series
- BluePill F103C8 64Kb
the compiler stops ...

Hello all,

I'm new to stm32duino (one week), sorry about that. Until now, I only programmed for AVR. Currently working on the project: LoRa RF95 (SPI) + BME280 (I2C) + BH1750 (I2C) + Oled SSD1306 (SPI) + of course STM32 :).

I have one success and a million questions. I started my project on ...