I built my own Arduino Uno. I designed the schematic and laid out the PCB for a school project. I am having problems getting the serial communication to work so that I can program sketches. Here are pictures from Pin0 and Pin1 of the headers (Rx and Tx) when I send information using an Echo sketch. I programmed the sketch using the ICSP.
What can I do to fix my issue?
Below are screenshots of the code and the serial monitor before and after I send a message.
When I took the pictures I sent a long random message so that I had time to freeze the scope.
Here is the schematic I made: