Processing 1.0 - Processing Discourse - Processing<->Arduino: strange numbers

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Index › Programming Questions & Help › Syntax Questions › Processing<->Arduino: strange numbers

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Processing<->Arduino: strange numbers (Read 273 times)

greg_rasputin

Processing<->Arduino: strange numbers
Mar 25^th, 2009, 6:04pm

Hello,

i am working on an g4 mac, 10.5.3.
through arduino "analog in" pin i am recieving data, which arrives well in the serial-monitor of the arduino ide (numbers between 0-1024).
then i want to get it to processing.
1. the processing lib doesn^t work, maybe because of my old mac?
2. Now, when i use the serial lib, i first recieve the data from arduino like this

void draw(){

byte[] inBuffer = new byte[7];

while (myPort.available() > 0) {

inBuffer = myPort.readBytes();
myPort.readBytes(inBuffer);

if (inBuffer != null) {
String myString = new String(inBuffer);

Then i have strings of different length, which I don§t manage to convert to integers. When e.g. using int(String) or transfering each singel part of the string to a char c1 = myString.charAt(i); and then to int its simplz not working. It becomes a strange row of numbers:
10
48
13
10
48
13
10
48
13
10
48
13

SOmeone has a idea?

fjen

Re: Processing<->Arduino: strange numbers
Reply #1 - Mar 25^th, 2009, 8:10pm

you are sending your values as string (which is what the serial monitor assumes) but processing reads them as bytes.

one way to read values between 0-1023 is to read them as string and convert that to int:

import processing.serial.*;

Serial myPort;
int lf = 10;
String myString;

void setup ()
{
println( Serial.list() );
myPort = new Serial( this, Serial.list()[1], 9600 );
}

void draw ()
{
while (myPort.available() > 0)
{
myString = myPort.readStringUntil(lf); // assumes you are sending them with println()
if (myString != null) {
println(int(myString.trim()));
}
}
}

F

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