Processing not finding Arduino Uno

Processing Electronics (Arduino, etc.)
2

Has the COM port changed? It is not always the first one in the array.

Try the code here and change COM port as required:

I always have this in my code to verify:

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

On my PC:

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image618×636 33.6 KB

It may not be that simple but it is a starting point.

Simplify your code when testing to isolate issues.

I did not have your hardware and reduced it to test what I could:

Receive:

import processing.serial.*;

Serial myPort;  // Create object from Serial class
String val;     // Data received from the serial port
boolean SerialAvailable = false;

void setup() {
  size(400, 250);

  try {
    String portName = Serial.list()[2]; //change the 0 to a 1 or 2 etc. to match your port
    myPort = new Serial(this, portName, 9600);
    myPort.bufferUntil('\n');
    SerialAvailable = true;
    println("Arduino found");
  }
  catch(Exception e) {
    println("Arduino not found");
    SerialAvailable = false;
  }
}

void draw() {
  CheckSerialCom();
}

void CheckSerialCom() {
  if (SerialAvailable) {
    SerialCom();
  }
}

void SerialCom() {
  // If data is available,
  if ( myPort.available() > 0) {
    val = myPort.readStringUntil('\n');         // read it and store it in val

    if (val != null) {
      val = trim(val);      // removes whitespace + \r + \n
      println(val);
    }
  }
}

Send:


int i;

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

  while (!Serial) {
    delay(10);
  }
}

void loop() {
  // Get the currently touched pads

      Serial.print(millis());
      Serial.print(",");
      Serial.print(i++);
      Serial.println();
      
  delay(100);
}

The above worked when selecting the correct COM port.

It did not find the COM port once time and I did a power reset unplugging USB (and plugging in).

Operating system?
Version of Processing in different systems?
Arduino IDE? Should not impact communication unless monitor is running.

:)