Here is the code:
int analogPin = 0;
int analogValue = 0;
void setup()
{
// start serial port at 9600 bps:
Serial.begin(9600);
}
void loop()
{
// read analog input, divide by 4 to make the range 0-255:
analogValue = analogRead(analogPin);
analogValue = analogValue / 4;
Serial.print(analogValue, BYTE);
// pause for 10 milliseconds:
delay(10);
}
Here are our first attempts at using processing to graph serial communication with the potentiometer:
Here’s the code, with appropriate props given to the great Tom Igoe:
/*
Sensor Graphing Sketch
This sketch takes raw bytes from the serial port at 9600 baud and graphs them.
Created 20 April 2005
Updated 5 August 2008
by Tom Igoe
*/
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.
myPort = new Serial(this, Serial.list()[0], 9600);
// 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++;
}
}
The only modifications we made to the program were in the choices of our colors. I went with a pink and lime green color scheme for her graph as a tribute to my old job, PartyCat, while Gordie the Red Sox Fan chose red and blue as a tribute.
