Serial communication with Processing

Projects Interfacing w/ Software on the Computer
1

I need that my Arduino communicates with Processing, but without Firmata.

However I have a little problem.
If I write this code on arduino:

void setup()
{
Serial.begin(9600);
}
void loop()
{
Serial.println(analogRead(0));
}

and this on Processing

import processing.serial.*;
Serial myPort;  


void setup() 
{
  myPort = new Serial(this, "COM3", 9600);
}

void draw()
{
  if ( myPort.available() > 0) {  
     println (myPort.read());    
  }

}

...processing reads only these wrong values (Arduino serial monitor reads the right ones):

13
10
54
49
48
13
10
54
49
48

Why?

2

...processing reads only these wrong values (Arduino serial monitor reads the right ones):

No, it doesn't. 10 is a line feed. 13 is a carriage return. 54 is a '6'. You can look at an ASCII table to figure out the rest.

You need to collect the data in a character array, and use atoi() to convert the character array to an int. Or use Processing's string handling functions that do the same thing.

3

Could you please give me an example of how should I use the function atoi()?

4

hi there,

i got the exact same problem

if i use readString instead, i get the correct data.
but if i use readString, i cant display the text with my gui, i only can read with println in processing monitor.

5

i only can read with println

Really? Would you care to explain how you can read (input) anything using an output function?