How I can test those pins?
I guess maybe I fired my Arduino because RX & TX always sent 5V , don't matter if I upload a empity sketch ; Always sent 5v both pins-It's normal this?
Thanks a lot! for your help guys;Then those pins I can't use like digital outputs isn't?
You can't if you have Serial.begin in your code. Remove the Serial stuff and you can use them as normal digital IO.
I wish know what is normal behavior those pins , to know is they are damaged ; Thanks for help in this Forum now I know a lot about TX RX pinsh