Arduino Serial Echo 1.0

/*
  Serial Echo v 1.0 ------ 8 August 2020

  Runs on Uno/Mega/Nano/whatever because only the PC-USB connection is used.

  This sketch is for testing what serial data the PC is sending to the Arduino.

  This sketch listens for characters on the USB serial line, then returns the char integer (ordinal) value.

*/

byte byteRead;

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available()) {
    byteRead = Serial.read();
    Serial.println(byteRead);
  }
}