processing与arduino之间相互感应的问题
arduino中设定超声波传感器检测一段距离，在processing中编写如果这段距离别打破（缩小到一定的距离），会出现播放视频的效果，再去打破这段距离就会切换这段视频。之后就是再去触碰这段距离，两个视频相互切换。在if语句中出现了一些问题。求解！！！谢谢！！！arduino代码：
const int TrigPin = 8;
const int EchoPin = 9;
float cm;
void setup()
{
Serial.begin(9600);
pinMode(TrigPin, OUTPUT);
pinMode(EchoPin, INPUT);
}
void loop()
{
digitalWrite(TrigPin, LOW);
delayMicroseconds(2);
digitalWrite(TrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(TrigPin, LOW);
cm = pulseIn(EchoPin, HIGH) / 58.0;
Serial.print(cm);
Serial.print("cm");
Serial.println();
delay(1000);
}
processing代码：
mport processing.serial.*;
import processing.video.*;
Serial port;
int val;
Movie movie1;
Movie movie2;
void setup(){
size(1280,720);
background(0);
port = new Serial(this, "COM3", 9600);
movie1 = new Movie(this,"12345.mov");
movie2 = new Movie(this,"54321.mov");
movie1.loop();
movie2.loop();
}
void movieEvent(Movie m) {
m.read();
}
void draw(){
if(port.available() >0 ) {
val = port.read();
}
if(val ==0 ) {
image(movie2,0,0,width,height);
}
else {
image(movie1,0,0,width,height);
}
} Serial.print(cm);
Serial.print("cm");
Serial.println();
尽量不要向processing发送这么多无用的字符，如果可以的话，当条件满足时仅仅向processing发送0或者1就可以。超声波数据由arduino判断，而不是processing。 根据要求，进入检测范围就对Processing的视频1和视频2交换一次，因此，程序修改为
//Arduino
intsw=0; //开关状态
int valume=30; //可设置距离临界点
const int TrigPin = 8;
const int EchoPin = 9;
float cm;
void setup()
{
Serial.begin(9600);
pinMode(TrigPin, OUTPUT);
pinMode(EchoPin, INPUT);
}
void loop()
{
digitalWrite(TrigPin, LOW);
delayMicroseconds(2);
digitalWrite(TrigPin, HIGH);
delayMicroseconds(10);
digitalWrite(TrigPin, LOW);
cm = pulseIn(EchoPin, HIGH) / 58.0;
Serial.print(cm);
Serial.print("cm");
Serial.println();
if (cm<valume){ //进入范围检测
if (sw=0){sw=1; //状态变化转换
}
else sw=0;
Serial.write(sw); //向Processing发状态
}
delay(1000);
}
1、建议调试是可以用Serial.print，但是在和Processing通讯时把他去掉，避免干扰。
2、和Processing通讯时Arduino这边用Serial.Write()语句。 关于传感器和Processing的交互，通常传感器通过Aruino和Processing通讯，传递传感器的参数或状态，在Processing\file\example\libaries\serial\SimpleRead案例，解释了Arduino和Processing该怎么做：
/**
* Simple Read
*
* Read data from the serial port and change the color of a rectangle
* when a switch connected to a Wiring or Arduino board is pressed and released.
* This example works with the Wiring / Arduino program that follows below.
*/
import processing.serial.*;
Serial myPort;// Create object from Serial class
int val; // Data received from the serial port
void setup()
{
size(200, 200);
// I know that the first port in the serial list on my mac
// is always myFTDI adaptor, so I open Serial.list().
// On Windows machines, this generally opens COM1.
// Open whatever port is the one you're using.
String portName = Serial.list();
myPort = new Serial(this, portName, 9600);
}
void draw()
{
if ( myPort.available() > 0) {// If data is available,
val = myPort.read(); // read it and store it in val
}
background(255); // Set background to white
if (val == 0) { // If the serial value is 0,
fill(0); // set fill to black
}
else { // If the serial value is not 0,
fill(204); // set fill to light gray
}
rect(50, 50, 100, 100);
}
/*
// Wiring / Arduino Code
// Code for sensing a switch status and writing the value to the serial port.
int switchPin = 4; // Switch connected to pin 4
void setup() {
pinMode(switchPin, INPUT); // Set pin 0 as an input
Serial.begin(9600); // Start serial communication at 9600 bps
}
void loop() {
if (digitalRead(switchPin) == HIGH) {// If switch is ON,
Serial.write(1); // send 1 to Processing
} else { // If the switch is not ON,
Serial.write(0); // send 0 to Processing
}
delay(100); // Wait 100 milliseconds
}
*/
供参考 感谢！！！ 666666666666 lz能把完整的代码发给我吗
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