刚才从网上抄来一段程序，就是利用Processing来显示Arduino单片机引脚的电压，显示结果如下：
程序来自：http://boolscott.wordpress.com/2010/02/04/arduino-processing-analogue-bar-graph-2/
Arduino部分：
//Sending 8 bit reading (256) so analogue
//reading can be sent in 1 byte
int Analogue0 = 0; // first analog sensor
int Analogue1 = 0; // second analog sensor
int Analogue2 = 0; // digital sensor
int Analogue3 = 0; // second analog sensor
int Analogue4 = 0; // second analog sensor
int Analogue5 = 0; // second analog sensor
int inByte = 0; // incoming serial byte
void setup()
{
// start serial port at 9600 bps:
Serial.begin(9600);
establishContact(); // send a byte to establish contact until Processing responds
}
void loop()
{
// if we get a valid byte, read analog ins:
if (Serial.available() > 0) {
// get incoming byte:
inByte = Serial.read();
// read first analog input, divide by 4 to make the range 0-255:
Analogue0 = analogRead(0)/4;
// delay 10ms to let the ADC recover:
delay(10);
// read second analog input, divide by 4 to make the range 0-255:
Analogue1 = analogRead(1)/4;
// read switch, multiply by 155 and add 100
// so that you're sending 100 or 255:
delay(10);
Analogue2 = analogRead(2)/4;
delay(10);
Analogue3 = analogRead(3)/4;
delay(10);
Analogue4 = analogRead(4)/4;
delay(10);
Analogue5 = analogRead(5)/4;
delay(10);
// send sensor values:
Serial.print(Analogue0 , BYTE);
Serial.print(Analogue1 , BYTE);
Serial.print(Analogue2 , BYTE);
Serial.print(Analogue3 , BYTE);
Serial.print(Analogue4 , BYTE);
Serial.print(Analogue5 , BYTE);
}
}
void establishContact() {
while (Serial.available() <= 0) {
Serial.print('A', BYTE); // send a capital A
delay(300);
}
}
Processing部分：（在源程序基础之上修改了串口号）
// Feel Free to edit these variables ///////////////////////////
String xLabel = "Analogue Inputs";
String yLabel = "Voltage (V)";
String Heading = "The Graph Sketch";
String URL = "01/02/2010";
float Vcc = 5.0; // the measured voltage of your usb
int NumOfVertDivisions=5; // dark gray
int NumOfVertSubDivisions=10; // light gray
int NumOfBars=6; // you can choose the number of bars, but it can cause issues
// since you should change what the arduino sends
// if these are changed, background image has problems
// a plain background solves the problem
int ScreenWidth = 600, ScreenHeight=400;
/////////////////////////////////////////////////////////
// Serial port stuff ///////////////////////
import processing.serial.*;
Serial myPort;
boolean firstContact = false;
int[] serialInArray = new int[6];
int serialCount = 0;
///////////////////////////////////////////////
int LeftMargin=100;
int RightMArgin=80;
int TextGap=50;
int GraphYposition=80;
float BarPercent = 0.4;
int value;
PFont font;
PImage bg;
int temp;
float yRatio = 0.58;
int BarGap, BarWidth, DivisounsWidth;
int[] bars = new int[NumOfBars];
void setup(){
// bg = loadImage("BG.jpg");
/// NB SETTINGS ////////////////////////////////////////////////////////
myPort = new Serial(this, Serial.list()[0], 9600);
////////////////////////////////////////////////////////////////////////
DivisounsWidth = (ScreenWidth-LeftMargin-RightMArgin)/(NumOfBars);
BarWidth = int(BarPercent*float(DivisounsWidth));
BarGap = DivisounsWidth - BarWidth;
size(ScreenWidth,ScreenHeight);
font = createFont("Arial",12);
textAlign(CENTER);
textFont(font);
}
void draw(){
// background(bg); // My one used a background image, I've
background(250); // commented it out and put a plain colour
// Headings(); // Displays bar width, Bar gap or any variable.
Axis();
Labels();
PrintBars();
}
// Send Recieve data //
void serialEvent(Serial myPort) {
// read a byte from the serial port:
int inByte = myPort.read();
if (firstContact == false) {
if (inByte == 'A') {
myPort.clear(); // clear the serial port buffer
firstContact = true; // you've had first contact from the microcontroller
myPort.write('A'); // ask for more
}
}
else {
// Add the latest byte from the serial port to array:
serialInArray[serialCount] = inByte;
serialCount++;
// If we have 6 bytes:
if (serialCount > 5 ) {
for (int x=0;x<6;x++){
bars[x] = int (yRatio*(ScreenHeight)*(serialInArray[x]/256.0));
}
// Send a capital A to request new sensor readings:
myPort.write('A');
// Reset serialCount:
serialCount = 0;
}
}
}
/////// Display any variables for testing here//////////////
void Headings(){
fill(0 );
text("BarWidth",50,TextGap );
text("BarGap",250,TextGap );
text("DivisounsWidth",450,TextGap );
text(BarWidth,100,TextGap );
text(BarGap,300,TextGap );
text(DivisounsWidth,520,TextGap );
}
void PrintBars(){
int c=0;
for (int i=0;i<NumOfBars;i++){
fill((0xe4+c),(255-bars[i]+c),(0x1a+c));
stroke(90);
rect(i*DivisounsWidth+LeftMargin, ScreenHeight-GraphYposition, BarWidth, -bars[i]);
fill(0x2e,0x2a,0x2a);
text(float(bars[i])/(yRatio*(ScreenHeight))*Vcc, i*DivisounsWidth+LeftMargin+BarWidth/2, ScreenHeight-bars[i]-5-GraphYposition );
text("A", i*DivisounsWidth+LeftMargin+BarWidth/2 -5, ScreenHeight-GraphYposition+20 );
text(i, i*DivisounsWidth+LeftMargin+BarWidth/2 +5, ScreenHeight-GraphYposition+20 );
}
}
void Axis(){
strokeWeight(1);
stroke(220);
for(float x=0;x<=NumOfVertSubDivisions;x++){
int bars=(ScreenHeight-GraphYposition)-int(yRatio*(ScreenHeight)*(x/NumOfVertSubDivisions));
line(LeftMargin-15,bars,ScreenWidth-RightMArgin-DivisounsWidth+50,bars);
}
strokeWeight(1);
stroke(180);
for(float x=0;x<=NumOfVertDivisions;x++){
int bars=(ScreenHeight-GraphYposition)-int(yRatio*(ScreenHeight)*(x/NumOfVertDivisions));
line(LeftMargin-15,bars,ScreenWidth-RightMArgin-DivisounsWidth+50,bars);
}
strokeWeight(2);
stroke(90);
line(LeftMargin-15, ScreenHeight-GraphYposition+2, ScreenWidth-RightMArgin-DivisounsWidth+50, ScreenHeight-GraphYposition+2);
line(LeftMargin-15,ScreenHeight-GraphYposition+2,LeftMargin-15,GraphYposition);
strokeWeight(1);
}
void Labels(){
textFont(font,18);
fill(50);
rotate(radians(-90));
text(yLabel,-ScreenHeight/2,LeftMargin-45);
textFont(font,16);
for(float x=0;x<=NumOfVertDivisions;x++){
int bars=(ScreenHeight-GraphYposition)-int(yRatio*(ScreenHeight)*(x/NumOfVertDivisions));
text(round(x),-bars,LeftMargin-20);
}
textFont(font,18);
rotate(radians(90));
text(xLabel,LeftMargin+(ScreenWidth-LeftMargin-RightMArgin-50)/2,ScreenHeight-GraphYposition+40);
textFont(font,24);
fill(50);
text(Heading,LeftMargin+(ScreenWidth-LeftMargin-RightMArgin-50)/2,70);
textFont(font);
fill(150);
text(URL,ScreenWidth-RightMArgin-40,ScreenHeight-15);
textFont(font);
}
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