I've worked AVR microprocessors (used in Arduino) and I found that for as small programs as I would write on a micro controller even assembly programming works.

I've worked AVR microprocessors (used in Arduino) and I found that for as small programs as I would write on a micro controller even assembly programming works. But C is definitely a good fit. Since you need effortless access to many low level details I think C is probably the best language for writing micro controller software. Of course as the software gets larger I guess it start making more sense to switch to something like Swift or Rust. The right tool for the job right? C is the right choice in many cases. It is just that C/C++ has been used for a lot more jobs than they are the right choice for.