Processing 1.0 - Processing Discourse - getting value from arduino

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Index › Programming Questions & Help › Electronics, Serial Library › getting value from arduino

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getting value from arduino (Read 5018 times)

ariel

getting value from arduino
Apr 20^th, 2008, 1:35am

hi, beeing a newbie, i need some help,
i would like to get a simple value in processing coming from my arduino via my serial port.
here is my arduino code:

int pin1 = 0;
int led = 13;
int val = 0;
void setup()
{
pinMode(led, OUTPUT);
pinMode(pin1, INPUT);
beginSerial(9600);
}
void loop()
{
val = analogRead(pin1);
digitalWrite(led, HIGH);
delay(val);
digitalWrite(led, LOW);
delay(val);
}
so i get my expected value in the serial monitor, but the problem is in precessing,
i dont really know how to get my value in precessing,
what's the easiest way to do that? serial libray or firmata? i'm a bit lost and tried several things without succeeding .
sorry for this simple question.

this is my procesing sketch, just to see if the value is received...
but nothing changes.

import processing.serial.*;

Serial port;
int val;

void setup()
{
size(100, 100);
port = new Serial(this, 9600);
}

void draw()
{
if (0 < port.available()) {
val = port.read();
}
background(val/4);
}

thanks for your help.

hype1 YaBB Newbies Offline Posts: 27	Re: getting value from arduino Reply #1 - Apr 20^th, 2008, 11:45pm The Serial library will do just fine for this. Check these library examples for some simple examples.

ifallacy

Re: getting value from arduino
Reply #2 - Jun 15^th, 2008, 5:24am

I use
http://www.arduino.cc/playground/Interfacing/Firmata
to get values via serial port - don't forget to adjust the serial port values in the Firmata processing scripts to get the right one

I just posted:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Exhibition;action=display;num=1213500039

maybe it'll help? =]

best of luck,
-Jeff

alkopop79

Re: getting value from arduino
Reply #3 - Oct 30^th, 2009, 2:03am

Hi there,

trying to get values form a Sharp proximity sensor attached to an analog input. Unfortunately nothing happens, the value is 0. I tried the arduino with max/msp where it worked perfectly. Where did I go wrong in this sketch?

Quote:

import cc.arduino.*;

import processing.serial.*;

import promidi.*;

Arduino arduino;

MidiIO midiIO;
MidiOut midiOut;

int sensorv;

void setup(){
  size(200,200);
  arduino = new Arduino(this, Arduino.list()[0], 57600);
  midiIO = MidiIO.getInstance(this);
  midiOut = midiIO.getMidiOut(1,"IAC Driver - Bus 1");

  midiIO.printDevices();
  println(Arduino.list());

}
void draw(){
  background(0);
  sensorv = arduino.analogRead(0);
  midiOut.sendController(new Controller(1,sensorv));
  println(sensorv);
}

sestys

Re: getting value from arduino
Reply #4 - Nov 7^th, 2009, 4:02pm

I use this code for reading values from Arduino:

Arduino reads analog input and sends float variable.
Code:

int analogPin = 0;
float temp = 0;

void setup() { 
  Serial.begin(9600);
} 
 
void loop() {
  temp=analogRead(analogPin);
  temp=(map(temp,0,1024,0,5000)/10.0);
  Serial.println(temp); // println add Linefeed to my float
  delay(1000);
}

Processing reads and displays float from serial.
Code:

import processing.serial.*;

int lf = 10;    // Linefeed in ASCII
String myString = null;
Serial myPort;  // Serial port you are using
float num;

void setup() {
  myPort = new Serial(this, Serial.list()[0], 9600);
  myPort.clear();
}

void draw() {
  while (myPort.available() > 0) {
    myString = myPort.readStringUntil(lf);
    if (myString != null) {
	print(myString);  // Prints String
	num=float(myString);  // Converts and prints float
	println(num);
    }
  }
  myPort.clear();
}

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