Processing and Arduino via Serial issue

colby.jen..

Processing and Arduino via Serial issue

in Integration and Hardware • 3 months ago

Greetings all,

I'm attempting to trip an IR Sensor connected to my Arduino board that will then trigger an event in Processing.

I think I'm close, but I believe I'm having trouble in the Processing side of things.

My Arduino is communicating either a 1 or a 0 based on the HIGH and LOW states of the PIR Sensor (I'll include that code just in case)

Processing doesn't notice any problems, but when the PIR sensor is tripped (i have an LED attached to be sure), the sketch doesn't initiate the desired function. Help please! and Thank you in advance

Processing code:

import processing.serial.*;
XML xml;
PFont f;
XML[] comments;
int index;
Serial port;
int lf = 2;
void setup ()
{
f = createFont("Helvetica-48.vlw",16,true);
size(displayWidth, displayHeight);
background(0);
xml = loadXML("comments.xml");
comments = xml.getChildren("comment");
println(Serial.list());
port = new Serial(this, Serial.list()[4], 9600);
port.bufferUntil('\n');
}
void draw() {
//draw needs to be here to continue looping
}
void serialEvent (Serial port) {
String inString = port.readStringUntil(lf);
float inByte = float(inString);
if (inByte == '1') {
//put in here info for signalHigh
int index = int(random(comments.length));
String name = comments[index].getContent();
textFont(f, 24);
fill(245);
textAlign(LEFT);
text(name,width/4,height/4,width/2,height/2);
} else if (inByte == '0') {
//put in here info for signalLow
background(0);
}
}

Arduino Sketch

//set the addresses
int ledPin = 13;
int inputPin = 2;
int pirState = LOW;
int val = 0;
void setup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
pinMode(inputPin, INPUT);
}
void loop() {
val = digitalRead(inputPin); // read input value
if (val == HIGH) { // check if the input is HIGH
digitalWrite(ledPin, HIGH); // turn LED ON
delay(150);
if (pirState == LOW) {
// we have just turned on
Serial.println(digitalRead(inputPin));
// We only want to print on the output change, not state
pirState = HIGH;
}
} else {
digitalWrite(ledPin, LOW); // turn LED OFF
delay(300);
if (pirState == HIGH){
// we have just turned of
Serial.println(digitalRead(inputPin));
// We only want to print on the output change, not state
pirState = LOW;
}
}
}

Replies(4)

amnon.owed

Re: Processing and Arduino via Serial issue

3 months ago

Moved to Integration and Hardware.

Why? See: https://forum.processing.org/topic/where-to-place-threads-and-other-forum-practices

colby.jen..

Re: Processing and Arduino via Serial issue

2 months ago

Thanks for getting me to the right place. Sorry about that.

Anyone have any ideas on this? Still stuck.

colby.jen..

Re: Processing and Arduino via Serial issue

2 months ago

I thought I could circumnavigate my problems by using the Arduino Firmata. Still having similar issues. At this point I'm just trying to get an LED to light up... I'll add the magic later.

import processing.serial.*;
import cc.arduino.*;
Arduino arduino;
XML xml;
PFont f;
XML[] comments;
int index;
int ledPin = 13;
int PIRPin = 2;
void setup ()
{
f = createFont("Helvetica-48.vlw",16,true);
size(displayWidth, displayHeight);
background(0);
xml = loadXML("comments.xml");
comments = xml.getChildren("comment");
println(Arduino.list());
//port = new Serial(this, Serial.list()[4], 9600);
//port.bufferUntil('\n');
arduino = new Arduino(this, Arduino.list()[0], 57600);
arduino.pinMode(PIRPin, Arduino.INPUT);
arduino.pinMode(ledPin, Arduino.OUTPUT);
}
void draw() {
//draw needs to be here to continue looping
}
void loop() {
if (arduino.digitalRead(PIRPin) == Arduino.HIGH) {
arduino.digitalWrite(ledPin, Arduino.HIGH);
} else {
arduino.digitalWrite(ledPin, Arduino.LOW);
}
}

drkempton

Re: Processing and Arduino via Serial issue

2 months ago

I am a fellow Arduino user who is just starting to dabble with Processing. I wanted to use Processing to produce a score board for a reaction timer game built using an Arduino. So I get the Arduino to send the score value to Processing using "Serial.write(score)" and the score is then displayed in big characters in a box on the PC screen. It works well so if it is any help with what you are trying to do please let me know.

BTW: I changed the frameRate() to 5 frames per second as it was getting very processor intensive (50%+) otherwise. Declare that in the setup void.

void draw ()
{
fill (255, 255, 255);//white fill
rect (0, 0, 1500, 800);//draw a big box on the screen 1500 x 800 pixels (filled white)
int line=600;// y offset value - see below
if (myPort.available()>0) //if there is anything in the serial buffer
{
count=myPort.read();//read the value from the port and make it equal to variable "count".
fill(0,0,0);//black fill for font characters
textFont(f, 800);// define a huge font size!
text(count, 70, line);// write the value of count, 70 pixels in from the left and 600 down from the top of the box
}

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