Arduino for STM32

yes that makes perfect sense thank you

Arduino version 1.8.13
stm32duino version 1.9

While the stm32duino github pages states that various generic stm32l4 boards are supported they do not appear in the drop down menu as seen in my screen shot.

I do see one for L0 but not L4

I am rather new to the stm32duino side of things so what am i ...

I am considering making my own small board using the STM32L412KB or something similar. Preferably I would use something that is already supported by this library.

What tool chain am I going to need to get it up and running with stm32duino..has someone done this before and knows of a low power ...

and now for the I2c,,The front page from st has an image for 5 x i2c devices, I need 3 separate devices (same i2c address)
en.bd_stm32f411xe_512k.jpg

from the board layout of the weact I can only make out some vauge i2c pins..
https://github.com/WeActTC/MiniF4-STM32F4x1/blob/master/images ...

ok if I use STMcubeprogrammer (Serial) then I am able to upload a sketch..DFu didnt work for me but I think I am missing something important

Using for example a cp2102 or other uart adapters? Or via the USB c port? I will try now the Uart adapter. I also ha ve a stlink V3 can not find any documentation to use it on this board

Coming from the blue pill and needing some more i2c I got some of the weact stm32f11 boards. Just wondering if there is any sensible method to get this compiling at all under the stm32duino?
Any tips from those who have tried or suggestions on board settings/ bootloaders to use?
https://github.com ...

these particular i2c devices dont have a changeable address..its the as5600.

1 need 3 i2C devices in this blue pill while at the same time 12 hardware PWMs pins. Either core wouldnt bother me if I knew it was going to work...either that or porting the softwire to the other core.... ?

Ive run out of pins to use i2c on my blue pill and would love to try software i2c. I cant see any in the example but perhaps someone else has some more info?