透過COM port控制Arduino的辦法

這篇文章 大概就是我需要的解藥了
http://coopermaa2nd.blogspot.tw/2011/02/arduino-serial-led.html

內文提到使用switch (inByte)這指令來判斷按下的鍵盤按鈕為何?
這下對於特殊的ASCII就會有疑惑了,比如說上下左右呢?
果然網路上的資料真多,一查馬上有.

First Character is Escape (27 [0x1B]) followed by...
Key Pressed	ASCII Character		Key Pressed	ASCII Character
F1	0x3B		INS	0x52
F2	0x3C		DEL	0x53
F3	0x3D		HOME	0x47
F4	0x3E		END	0x4F
F5	0x3F		PAGE UP	0x49
F6	0x40		PAGE DOWN	0x51
F7	0x41		UP Arrow	0x48
F8	0x42		DOWN Arrow	0x50
F9	0x43		LEFT Arrow	0x4B
F10	0x44		RIGHT Arrow	0x4D
F11	0x57		WINDOWS	0x5B
F12	0x58		Print Screen	0x54

瞧這就是答案了.嘿嘿~距離計畫完成又更進一點了.

 switch(inByte)
        {
            case 0x49:
              Serial.print("[PgUp]");
              break;
            case 0x51:
              Serial.print("[PgDn]");
              break;    

搭配上回的步進馬達控制 組合起來就開心啦...

// defines pins numbers
const int XstepPin = 2;
const int XdirPin = 5;
const int YstepPin = 3;
const int YdirPin = 6;
// Makes pulses for making one full cycle rotation
const  int pulses = 2;

void setup() {
  Serial.begin(9600);
  // Sets the 4 pins as Outputs
  pinMode(XstepPin,OUTPUT);
  pinMode(XdirPin,OUTPUT);
  pinMode(YstepPin,OUTPUT);
  pinMode(YdirPin,OUTPUT);
}
void loop() {

  if (Serial.available() > 0) {
    int inByte = Serial.read();
    switch (inByte) {
    //UP Arrow
    case '0x48':
      digitalWrite(YdirPin,HIGH); // Enables the motor to move in a particular direction
      for(int y = 0; y < pulses; y++) {
        digitalWrite(YstepPin,HIGH);
        delayMicroseconds(50);
        }
        digitalWrite(YstepPin,LOW);
      break;
   
    //DOWN  Arrow
    case '0x50':
      digitalWrite(YdirPin,LOW); // Enables the motor to move in a particular direction
      for(int y = 0; y < pulses; y++) {
        digitalWrite(YstepPin,HIGH);
        delayMicroseconds(50);
        }
        digitalWrite(YstepPin,LOW);
      break;
     
    //LEFT Arrow
    case '0x4B':
      digitalWrite(XdirPin,LOW); // Enables the motor to move in a particular direction
      for(int x = 0; x < pulses; x++) {
      digitalWrite(XstepPin,HIGH);
      delayMicroseconds(50);        
      }  
      digitalWrite(XstepPin,LOW);
      break;

    //RIGHT Arrow
    case '0x4D':
      digitalWrite(XdirPin,HIGH); // Enables the motor to move in a particular direction
      for(int x = 0; x < pulses; x++) {
      digitalWrite(XstepPin,HIGH);
      delayMicroseconds(50);
      }  
      break;
      digitalWrite(XstepPin,LOW);
    }

PS.
文中其中提到沒有直接反應的RS232軟體.感謝Google
馬上找到免費的

AccessPort 1.36 RS232 串列埠存取工具

http://tedmyblog.blogspot.tw/2011/11/accessport-136-rs232.html