processing和Arduino怎么写

Processing和Arduino可以通过Serial通信进行交互。下面是一个简单的例子，演示如何通过Processing向Arduino发送数据并读取Arduino的响应。

Arduino代码：

void setup() {
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {
    int value = Serial.read();
    Serial.print("Received value: ");
    Serial.println(value);
    
    // Echo back the received value
    Serial.print("Echoing back value: ");
    Serial.println(value);
    Serial.write(value);
  }
}

Processing代码：

import processing.serial.*;

Serial myPort;  // Create object from Serial class
int value = 0;

void setup() {
  size(200, 200);
  myPort = new Serial(this, "COM3", 9600); // Change COM3 to the port your Arduino is connected to
}

void draw() {
  background(255);
  text("Press any key to send to Arduino", 10, 50);
  text("Received value from Arduino: " + value, 10, 100);
}

void keyPressed() {
  myPort.write(key);  // Send the key pressed to Arduino
}

void serialEvent(Serial myPort) {
  if (myPort.available() > 0) {
    value = myPort.read();  // Read the value sent by Arduino
  }
}

运行Processing代码后，按下任意按键即可向Arduino发送数据。Arduino会将收到的数据打印到串口，然后将数据回传给Processing。Processing会将收到的数据显示在屏幕上。