我一直在研究 Arduino 入门套件示例,最近,我遇到了一个问题,其中一个电位器用于更改计算机屏幕上徽标的颜色。当徽标最初出现时,它是电位器设置的正确颜色,但是当我移动电位器时颜色不会改变。
我尝试将电位器的值输出到串行监视器并且它们正确更改,但是处理代码读取的值在输出到串行监视器时不会更改。
这是Arduino代码:
void setup() {
// initialize serial communication
Serial.begin(9600);
}
void loop() {
// read the value of A0, divide by 4 and
// send it as a byte over the serial connection
Serial.write(analogRead(A0)/4);
delay(1);
}
这是处理代码:
// import the serial library
import processing.serial.*;
// create an instance of the serial library
Serial myPort;
// create an instance of PImage
PImage logo;
// a variable to hold the background color
int bgcolor = 0;
void setup() {
// set the color mode to Hue/Saturation/Brightness
colorMode(HSB, 255);
// load the Arduino logo into the PImage instance
logo = loadImage("http://arduino.cc/en/pub/skins/arduinoWide/img/logo.png");
// make the window the same size as the image
size(logo.width, logo.height);
// print a list of available serial ports to the
// Processing staus window
println("Available serial ports:");
println(Serial.list());
// Tell the serial object the information it needs to communicate
// with the Arduno. Change Serial.list()[0] to the correct
// port corresponding to your Arduino board. The last
// parameter (e.g. 9600) is the speed of the communication. It
// has to correspond to the value passed to Serial.begin() in your
// Arduino sketch.
myPort = new Serial(this, Serial.list()[0], 9600);
// If you know the name of the port used by the Arduino board, you
// can specify it directly like this.
// port = new Serial(this, "COM1", 9600);
}
void draw() {
background(255);
// if there is information in the serial port
if ( myPort.available() > 0) {
// read the value and store it in a variable
bgcolor = myPort.read();
// print the value to the status window
println(bgcolor);
}
// Draw the background. the variable bgcolor
// contains the Hue, determined by the value
// from the serial port
background(bgcolor, 255, 255);
// draw the Arduino logo
image(logo, 0, 0);
}
所以我认为问题在于 Serial.write 或 Serial.read 方法,但它可能完全不同。