10.2. Arduino UART receive/transmit ASCII character and decode with an oscilloscope demo sketch (Oscilloscopes for Busy People)

10_1_UART_RX_Counter.ino

/*  11.2. Arduino UART receive/transmit ASCII character and decode with an oscilloscope demo sketch 
 * 
 * Use this sketch to experiment with the decoding of an ASCII character
 * that is received and transmitted by an Arduino on an oscilloscope.
 * 
 * Use in tandem with the matching Processing sketch
 * 
 * Connect CH1 of the oscilloscope to pin 0 of the Arduino.
 * Connect CH2 of the oscilloscope to pin 1 of the Arduino.
 * 
 * 
 * This sketch was written for Oscilloscopes for Busy People by Peter Dalmaris.
 * Find out more at https://techexplorations.com/courses/oscilloscopes/
 * 
 * Components
 * ----------
 *  - Arduino Uno
 *  - An oscilloscope (of course)
 *  
 *  Libraries
 *  ---------
 *  - NONE
 *
 * Connections
 * -----------
 * 
 *   
 * 
 * Other information
 * -----------------
 *  -
 *  Created on September 12 2019 by Peter Dalmaris
 * 
 */

byte incomingByte = 0; // for incoming serial data

// the setup routine runs once when you press reset:
void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600,SERIAL_8N1);
}

// the loop routine runs over and over again forever:
void loop() {
  if (Serial.available() > 0) {
    // read the incoming byte:
    incomingByte = Serial.read();

    Serial.write(incomingByte); // This is the data we'll send to the PC. We'll include it in a single packet.
//    Serial.write(0x0A); // Use hex 0A as the packet end. This can be picked up by the Rigol.
                        // Alternative packet end bytes are 0x20 (space), 0x0D (CR), 0x0A (LF), FF, and 0x00 (NULL)
  }
}

10_2_Processing_RX_and_TX.pde

import processing.serial.*;

Serial myPort;      // The serial port
int whichKey = -1;  // Variable to hold keystoke values
int inByte = -1;    // Incoming serial data

void setup() {
  size(400, 300);
  // create a font with the third font available to the system:
  PFont myFont = createFont(PFont.list()[2], 14);
  textFont(myFont);

  // List all the available serial ports:
  printArray(Serial.list());

  // I know that the first port in the serial list on my mac
  // is always my  FTDI adaptor, so I open Serial.list()[0].
  // In Windows, this usually opens COM1.
  // Open whatever port is the one you're using.
  String portName = Serial.list()[7];
  myPort = new Serial(this, portName, 9600);
}

void draw() {
  background(0);
  text("Last Received (hex): " + hex(inByte), 10, 100);
  text("Last Received (dec): " + inByte, 10, 120);
  text("Last Received (char): " + char(inByte), 10, 140);
  text("Last Sent (hex): " + hex(whichKey), 10, 160);
  text("Last Sent (dec): " + whichKey, 10, 180);
  text("Last Sent (char): " + char(whichKey), 10, 200);
}

void serialEvent(Serial myPort) {
  inByte = myPort.read();
}

void keyPressed() {
  // Send the keystroke out:
  myPort.write(key);
  whichKey = key;
}