How to find the UART on the board?

Question

Electronics

There is a fee. Somewhere on it, well, it just has to be a UART. I don't know how to find. The OS (Android KitKat) has root access. Is there any way to find uart except how to send information to it from the OS and listen to each contact? Maybe somehow the voltage on the contact can be filtered out?

Answer 1

It’s probably 5-volt there (although I don’t know if there are 3.3?), so you can hardly determine it by the level. But to send and listen is a good option.

Answer 2

On Rx and Tx I had 3.3v DC
Tx and Rx determined by the selection method