查看轨迹球模块的源代码


[[Image:轨迹球模块.jpg|400px|thumb|轨迹球模块]]



=== 产品简介 ===
<br>
轨迹球模块采用黑莓轨迹球设计制作，模块可以通过滚轮运动传动X和Y方向的转轴，通过固定在转轴上的多极充磁磁体转动,对相应的SMD霍尔元件发出信号,从而确定运动轨迹。轨迹球下方还设计了一个小SMD开关，方便用户进行触发事件或“点击”选择。



=== 规格参数 ===
<br>
*供电电压：DC3.3 - 5V
*安装孔径：3MM
*模块尺寸：28*21*15.7MM（长*宽*高）
*孔间距：15MM
*模块重量：2.5g



=== 引脚说明 ===
<br>

{|border="1" cellspacing="0" align="center" cellpadding="5" width="700px"
|-
|align="left"|'''名称'''
|align="left"|'''说明'''
|-
|align="left"|RHT
|align="left"|Sign - right
|-
|align="left"|LET
|align="left"|Sign - left
|-
|align="left"|DWN
|align="left"|Sign - down
|-
|align="left"|UP
|align="left"|Sign - up
|-
|align="left"|KEY
|align="left"|Sign - key
|-
|align="left"|VCC
|align="left"|电源+5V
|-
|align="left"|GND
|align="left"|地

|}



=== 应用示例 ===
<br>
:'''电路连接示意图'''
<br>

{|border="1" cellspacing="0" align="center" cellpadding="5" width="700px"
|-
|align="left"|'''轨迹球模块'''
|align="left"|'''Arduino UNO'''
|-
|align="left"|RHT
|align="left"|D4
|-
|align="left"|LET
|align="left"|D3
|-
|align="left"|DWN
|align="left"|D6
|-
|align="left"|UP
|align="left"|D5
|-
|align="left"|KEY
|align="left"|D2
|-
|align="left"|VCC
|align="left"|电源+5V
|-
|align="left"|GND
|align="left"|地

|}

 
<!--[[Image: 轨迹球模块.jpg|400px|center|轨迹球模块接线图]]-->



:'''示例代码'''
<pre >
/**************************************************************************
BlackBerry Trackballer Breakout Demo
***************************************************************************/
//Define Trackballer Breakout pin connections to Arduino
#define Btn 2
#define Lft 3
#define Rht 4
#define Up 5
#define Dwn 6

//Define variables used in sketch
int buttonClick;
unsigned long mouse_Lft;
unsigned long old_mouse_Lft;
unsigned long mouse_Rht;
unsigned long old_mouse_Rht;
unsigned long mouse_Up;
unsigned long old_mouse_Up;
unsigned long mouse_Dwn;
unsigned long old_mouse_Dwn;
int x_position;
int y_position;

/*********************Setup Loop*************************/
void setup() {

  //Define pin functionality on the Arduino
  pinMode(Btn, INPUT);
  pinMode(Lft, INPUT);
  pinMode(Rht, INPUT);
  pinMode(Up, INPUT);
  pinMode(Dwn, INPUT);

  //Start Serial port for debugging.
  Serial.begin(9600);
  Serial.println("Begin Trackballer Demo");
  delay(1000);
  Serial.println("Begin Trackball tracking");
}


/*********************Main Loop*************************/
void loop() {
  //read the pin state
  mouse_Lft = digitalRead(Lft);
  mouse_Rht = digitalRead(Rht);
  if (mouse_Lft != old_mouse_Lft)
  {
    x_position = --x_position;
    old_mouse_Lft = mouse_Lft;
    Serial.print("Trackball Position: \t X-Position= ");
    Serial.println(x_position);
  }
  if (mouse_Rht != old_mouse_Rht)
  {
    x_position = ++x_position;
    old_mouse_Rht = mouse_Rht;
    Serial.print("Trackball Position: \t X-Position= ");
    Serial.println(x_position);
  }
  delay(50);
  //read the pin state
  mouse_Up = digitalRead(Up);
  mouse_Dwn = digitalRead(Dwn);
  if (mouse_Up != old_mouse_Up)
  {
    y_position = ++y_position;
    old_mouse_Up = mouse_Up;
    Serial.print("Trackball Position: \t  \t Y-position= ");
    Serial.println(y_position);
  }
  if (mouse_Dwn != old_mouse_Dwn)
  {
    y_position = --y_position;
    old_mouse_Dwn = mouse_Dwn;
    Serial.print("Trackball Position: \t  \t Y-position= ");
    Serial.println(y_position);
  }
  delay(50);

  //Check for button click. If present, print to Serial monitor.
  buttonClick = digitalRead(Btn);
  if (buttonClick == LOW)
  {
    Serial.println("Click");
  }
}
</pre>
程序下载地址：[http://pan.baidu.com/s/1c0dkUfY BlackBerry_Trackballer_Breakout_Demo]

程序运行结果：转动轨迹球，串口输出X、Y轴位置信息，点击按键串口输出“Click”。串口监视器截图：

[[Image:轨迹球串口输出.png|center|轨迹球串口输出]]

[http://www.yfrobot.com/thread-11709-1-1.html 教程地址附视频]


===参考资料===
<br>



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