Lab-Serial(2)
After uploading the following code to Processing, we can see the graph changing by turning the potentiometer.
Created 20 April 2005
Updated 5 August 2008
by Tom Igoe
Updated 2 November 2009
by Rob Faludi
*/
import processing.serial.*;
Serial myPort; // The serial port
int graphXPos = 1; // the horizontal position of the graph:
void setup () {
size(400, 300); // window size
// List all the available serial ports
println(Serial.list());
// I know that the fisrt port in the serial list on my mac
// is usually my Arduino module, so I open Serial.list()[0].
// Open whatever port is the one you're using.
try { // attempt to open this port
myPort = new Serial(this, Serial.list()[0], 9600);
}
// if the port cannot be opened, print an error message, then quit
catch (Exception e) {
println("** Error selecting serial port! **");
println(" Have you attached your Arduino? Does your code specify the right port?");
exit();
}
// set inital background:
background(48,31,65);
}
void draw () {
// nothing happens in draw. It all happens in SerialEvent()
}
void serialEvent (Serial myPort) {
// get the byte:
int inByte = myPort.read();
// print it:
println(inByte);
// set the drawing color. Pick a pretty color:
stroke(123,128,158);
// draw the line:
line(graphXPos, height, graphXPos, height - inByte);
// at the edge of the screen, go back to the beginning:
if (graphXPos >= width) {
graphXPos = 0;
// clear the screen:
background(48,31,65);
}
else {
// increment the horizontal position for the next reading:
graphXPos++;
}
}
