軌跡球模塊

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軌跡球模塊

產品簡介

軌跡球模塊採用黑莓軌跡球設計製作，模塊可以通過滾輪運動傳動X和Y方向的轉軸，通過固定在轉軸上的多極充磁磁體轉動,對相應的SMD霍爾元件發出信號,從而確定運動軌跡。軌跡球下方還設計了一個小SMD開關，方便用戶進行觸發事件或「點擊」選擇。

規格參數

• 供電電壓：DC3.3 - 5V
• 安裝孔徑：3MM
• 模塊尺寸：28*21*15.7MM（長*寬*高）
• 孔間距：15MM
• 模塊重量：2.5g

引腳說明

名稱	說明
RHT	Sign - right
LET	Sign - left
DWN	Sign - down
UP	Sign - up
KEY	Sign - key
VCC	電源+5V
GND	地

應用示例

電路連接示意圖

軌跡球模塊	Arduino UNO
RHT	D4
LET	D3
DWN	D6
UP	D5
KEY	D2
VCC	電源+5V
GND	地

示例代碼

/**************************************************************************
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");
  }
}

程序下載地址：BlackBerry_Trackballer_Breakout_Demo

程序運行結果：轉動軌跡球，串口輸出X、Y軸位置信息，點擊按鍵串口輸出「Click」。串口監視器截圖：

教程地址附視頻

參考資料

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