Reading serial data

Programming Questions

cyberctrl

in Programming Questions • 1 year ago

Hello I am reading serial from Arduino. They are correct but I want every 3 values to store my data to 3 different variables for R G B color as int. The code below does not work - Why the integers give 0 when I print them but before I convert to int the value is printed correct? can you please help?any hint very appreciated.

import processing.serial.*;
Serial port;
int x=0;
int y=0;
int i=0;
void setup(){
size(45,45);
port = new Serial(this,Serial.list()[1], 9600);
}
void draw() {
while (port.available() > 0) {
String inByteRED = port.readStringUntil(10);
if (inByteRED != null) {
int numRed=int(inByteRED);
println("inByteRED");
println(numRed);
}
String inByteGREEN = port.readStringUntil(10);
if (inByteGREEN != null) {
int numGreen=int(inByteGREEN);
println("inByteGREEN");
println(numGreen);
}
String inByteBLUE = port.readStringUntil(10);
if (inByteBLUE != null) {
int numBlue=int(inByteBLUE);
println("inByteBLUE");
println(numBlue);
}
}
port.clear();
}

Replies(6)

PhiLho

Re: READING SERIAL DATA

1 year ago

What values are displayed before you convert them?
Perhaps you need to trim them: int(inByteBLUE.trim())

PS.: Release Caps Lock before typing the subject.

cyberctrl

Re: Reading serial data

1 year ago

Thanks for the answer, trim does not seem to work because my inByte is an int. I tried to read as String but then I have the problem that I cannot convert to an integer. I saw one more post today with exactly the same issue. How to convert incoming string from serial to an int.See code below, the "intConv" variable returns only 0. How can I convert the variable "input" to an integer? Any help will be very appreciated.

import processing.serial.*;
Serial port;
void setup(){
size(45,45);
port = new Serial(this,Serial.list()[1], 9600);
}
void draw(){
while (port.available() > 0) {
String input = port.readStringUntil(10);
if (input != null) {
println( " Receiving: " + input);
trim(input);
int intConv = int(input);
println ("intConv:" + intConv);
}
}
}

PhiLho

Re: READING SERIAL DATA

1 year ago

" trim does not seem to work because my inByte is an int" No. You declared them as String...
You show your code, but I cannot run it. You didn't answer my question. What is the output of your latest code?
Oh, and trim() doesn't work like that... It won't change the string in place, because strings in Java are immutable. You have to assign it back to the variable.

cyberctrl

Re: READING SERIAL DATA

1 year ago

Many thanks for answer..The output of the last code is still zero for the intConv variable. Can you please give an example with a line of code what you mean by this: " trim() doesn't work like that... It won't change the string in place, because strings in Java are immutable. You have to assign it back to the variable."

PhiLho

Re: READING SERIAL DATA

1 year ago

I don't want the value of 'intConv' but the one of 'input'. As I wrote, I want the output you get in the console.
And you use trim like: input = trim(input);

cyberctrl

Re: Reading serial data

1 year ago

great!!! the code below works!! If you can you point me to a code that stores every 3 values in order to use them as RGB values or if you can give a hint how to achieve this I will appreciate it!!thanks in advance!! btw is this: " input = trim(input);" trimming blank space before and after the value?

import processing.serial.*;
Serial port;
void setup(){
size(45,45);
port = new Serial(this,Serial.list()[1], 9600);
}
void draw(){
while (port.available() > 0) {
String input = port.readStringUntil(10);
if (input != null) {
println( " Receiving: " + input);
input = trim(input);
int intConv = int(input);
println (" intConv:" + intConv);
}
}
}

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