Arduino for STM32

Yeah I noticed that there's no need for port when programming, but I have to select something, there's no no port option when there's at least one available, which in my case is COM1 (always shows), when the Nano is connected, COM3 becomes available.

Funny you mention that resetting the board is ...

Yes, I couldn't see it running because in order to upload I have to get the board into DFU mode, which for some reason doesn't work 80% of the time, I have to try a few times before getting it ready to upload, don't know why, then set it to COM1 and then try to upload, and after it's done, to see ...

forgot to mention that I can't check the serial monitor, unless I'm missing some config, it doesn't work through USB like the Nano, I'm werial for my serial to USB to arrive but that will takes weeks.
I could try using the multimeter I suppose.

changing "int analogValue = 0" to "uint32_t analogValue = 0" on line 10 did make the code compile and upload but now it doesn't work, the relay it's closed (activated) upon start, I switched pins and even got back to the Nano to see if any of the components had gone bad and no. Something else must ...

Hello, everyone.

I'm fairly new at this but I'm a very quick study.
Quick background info, I make furniture so I made a shop vac auto switch with a Nano, a current sensor and a relay. Everything wors perfect.

I removed the Nano because I wanted to do something else with it, so while purchasing ...