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 ...
There are ways to use Arduino as TTL converter. For instance, you can remove Atmel chip from your board (if it's not soldered) or connect RST to GND. However none of that has worked for me to connect ...
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