What microcontrollers do you recommend? Which of them are for UART communication method?

Question

Do it yourself

Which ones do you work with the most? Having difficulty programming/assembling circuits?

Answer 1

UARTs are supported by almost all modern microcontrollers. Most of them have hardware support - the programmer is only required to supply the UART transceiver with bytes in time.
In the absence of hardware support, it can be emulated