I am still learning Rust intensively so my questions might be irrelevant. I am also very inexperienced with embedded even though it's probably the funniest thing I have done .
One of the things I would love to do is to port a project (the classical obstacle avoiding robot) I wrote for PIC32 in C to Rust.
I redid (of course!) this project with Arduino together with kids in my neighborhood - simpler version, without interrupts though.
That is to say I am open to try on any micro-controller, preferably GPIO to start smoothly.
What would be the friendliest micro-controller that I could use (easiest board, most documented crate)?
If you have the patience, please explain like you would to an 11 years old. Firstly I am not experienced enough, secondly, I might do the project with the kiddies in my neighborhood (we have a programming hang-out), so several people might benefit from your efforts .
They should generally work with compatible clones. The quality of those can be a bit questionable from time to time though, so I tend to recommend using official hardware.
I can recommend the STM32F3 series, which is used on the F3 discovery board, used in the Discovery book, an excellent introduction into embedded Rust.
A lot of people get started with the "Blue Pill", which uses an STM32F103. You can get these boards for very cheap, though the quality varies.
The nRF52 series is also pretty good, it has its own set of HAL crates here that are also fairly nice to use. You can get the nRF52840-DK board to get started. The cool thing about these is that they have a 2.4 GHz radio that can speak various protocols.
The HAL is reasonably complete and well-documented (I've put a huge amount of work into it this year), and the LPC845-BRK is a decent board (with an on-board programmer, which I believe the Blue Pill doesn't have) that costs around 6€ at places like Farnell and Mouser.
After a dramatic failure this morning with reading my sensors output, I am ordering the F3 to learn from the book. Sadly it is not available right now. Can I order any STM32F3 series (this one has camera surveillance interface ). Looks like it has every external peripheral one can wish, but inside.