Trouble whith reading data

Projects Programming
1

guys save me
processing code:

import processing.serial.*;
import controlP5.*;
Serial port;
ControlP5 cp5;
int start = 1;
void setup() {
   cp5 = new ControlP5(this);
   port = new Serial(this, "COM5", 9600);
}
void draw() {
   if (start == 1) {
     port.write("1\n");
     println(port.read());
     start++;
   }
}

arduino code:

void setup() {
   Serial.begin(9600);
}
void loop() {
   if(Serial.available()){
     char ss = Serial.read();
     Serial.println(ss);
   }
}

Why does it return -1 to the processing port?

2

See a difference? One sends a character and a line ending, the other receives a character and prints it. Next time around, the character read is the line ending character.

3

I tried whithout \n, result the same

4

Ok. I don't work with Processing, so I think you'll have to wait for someone conversant to happen along.

1 Like
5

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Thanks in advance for your cooperation.

Do you think the answer is ready to read nanoseconds after you sent something?

-1 means nothing to read

6

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