Problem: Values in Processing from Arduino - no stability?

Projects Programming
1

Hi,

In Processing I am receiving values from Arduino with a light sensor - but the values are not stable, even though I am not changing the amount light:

How do I get stable values in Processing?

They are jumping like this:

140
49
52
48
13
10
140
49
52
48
13

In Arduino they are quite stable (printed in the serial monitor)..

Thanks.

2

The numbers that you have posted above look very much like ASCII values. How are you sending the values ?

3

I am a complete rookie - The code in Arduino looks like this:

void setup() {

Serial.begin(9600);
}

void loop() {
:
int sensorValue = analogRead(A0);

Serial.println(sensorValue/4);
Serial.write(analogRead(A0)/4);
delay(1);
}

And in Processing:

import processing.serial.*;

Serial port;
int val;

void setup()
{
size(400, 400);
noStroke();
frameRate(10);

port = new Serial(this, "COM3", 9600);
}

void draw() {
if (0 < port.available()) {
val = port.read();
println(val);
}

background(204);
fill(val);
rect(100, 100, 300, 300);

}

4

(deleted)

5 
ASCII		Character
140
49			1
52			3
48			0
13			carriage return
10			linefeed
140
49			1
52			3
48			0
13			carriage return

Looks a lot like ASCII characters to me.

6

UKHeliBob:
Looks a lot like ASCII characters to me.

Yep, except it's printing the ascii for 140 (not 130), the same as the value that serial.write is putting out. :slight_smile:

7

Mixing ASCII data (print() and println()) and binary date (write()) is really not a good idea.

8

It works! Thank you very much...