If you doesn't have TTL (Transistor-Transistor Logic) USB and want to do Rx-Tx transmission. Don't worry you can use us arduino. From simple hardware modification you can use your Arduino as USB TTL ...

This repository is created in the spring of 2017 for a TTL chip checking program written in Arduino. Creators: Jax Sun, Steve Wang. The TTL check Arduino programs are able to use an Arduino board to ...