Hello everyone,

i'm working on a processing sketch which is activated by an emergency button connected to arduino. Arduino is loaded with a standard firmata and the button is quite similar to the one in the picture. Its mechanism is quite simple: it connects two wires and close their circuit by default; on press (and for the whole time it is pressed) the circuit opens. Sadly i'm very poorly skilled in both coding and electronics and it took me a while to understand that, because of the capacity of the wires (1m long, thick copper wires), i couldn't use a "arduino.digitalRead()" function to understand when the button was pressed (and the circuit opened) because there was always a small voltage reaching the pin.
So I connected the button on one side to 5v and the other to an analog pin and used an arduino.analogRead() to check when there was a decreasing in the circuit capacity and understand the button was pressed.

1. void draw() {  
2.   if ( (arduino.analogRead(pinBottone) < 800) && (animazione.activated == false)) {
3.     delay(100);
4.     animazione.activated = true;
5.     immagine.update();
6.   }

I checked any source on the internet and coudln't find any way of communication between processing and a printer. Does anybody have any idea about it, any solution or any suggestion to where i can direct my research?
I'm working on a personal project which requires the printing of a graphical output but since my coding skills are pretty limitedt i wouldn't prefer to get into cocoa or something like that! :)

Hello everybody, i'm trying to work with PGraphics, but something keeps getting wrong. The problem that i can't understand is why processing draws on the screen everything between beginDraw() and endDraw(), but doesn't draw anything when i call the picture back with image(pic, x, y).
It seemed so easy in the beginning but i already wasted 3 nights looking for bugs in my code or common problems in the internet.
Thank you in advance!

1. int pxwidth=2;
2. PGraphics randompic = createGraphics(100, 100, P2D);
3. void setup(){
4.   size(100,100);
5.   noStroke();
6.   background(255);
7. }
8. void draw(){
9.   background(255);
10.   if (keyPressed){
11.     if(key == 'a' || key == 'A'){
12.       randompic.beginDraw();
13.          for (int x=0; x<width/pxwidth; x++){
14.          for (int y=0; y<height/pxwidth; y++){
15.            int colore = (int)random(0,20);
16.            if (colore < 10) {fill(0);} else if (colore >= 10) {fill(255);}
17.            rect(x*pxwidth, y*pxwidth, pxwidth, pxwidth);
18.           }
19.         } 
20.       randompic.endDraw();
21.     }   
22.     if(key == 's' || key == 'S'){
23.       image(randompic, 0, 0);
24.     }
25.   }
26. }