Serial read() Arduino

Processing Electronics (Arduino, etc.)
1

Hi!

I have successfully established a Serial connection from Arduino to Processing using the read()-function (read() / Libraries / Processing.org). This only returns numbers between 0 and 255 though and I was wondering what the best method for receiving higher number would be?

Do I have to use readString() and convert it to an integer?

2

Hi

Map / Examples / Processing.org.

3

Thanks, but I want to receive let’s say numbers from 0 to 4000 from Arduino and not “map it down” to 0–255…

4

Hi
You didn’t post your code you can send and receive any value you need depending on your code and need

Look at this example
https://senzor.robotika.sk/sensorwiki/index.php/Processing_7-segment_display

2 Likes
5
2 Likes
6

Please consider the following demo and see if you can adapt it to your project. The demo will send random integers from 255 to 1024 from Arduino followed by a line feed. The Processing code will put the incoming data into a string and break it at the line feed. The resulting string is then reconverted to an integer and printed to the console.

Processing Code:

import processing.serial.*;

Serial myPort;
String inStr;

void setup() {
  surface.setVisible(false);
  printArray(Serial.list());
  // Select port for your system
  myPort= new Serial(this, Serial.list()[4], 9600);
}

void draw() {
}

void serialEvent( Serial myPort) {
  //put the incoming data into a String -
  //the '\n' is delimiter indicating the end of a complete packet
  inStr = myPort.readStringUntil('\n');
  //make sure our data isn't empty before continuing
  if (inStr != null) {
    //trim whitespace and formatting characters (like carriage return)
    inStr = trim(inStr);
    int val = Integer.valueOf(inStr);
    println("value = ", val);
  }
}

Arduino Code:

long randNumber;

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

void loop() {
  // print a random number from 255 to 1024
  randNumber = random(255, 1024);
  Serial.println(randNumber);
  delay(50);
}
2 Likes
7

Yes, I wasn’t very specific sorry. I simply want to send sensor values higher than 255 from Arduino to Processing – I understand now Serial.write() and read() in not the way to go. Thank you for your help!

8

This is very useful, thank you so much!