[IoT 終端裝置應用] Arduino 步進馬達實作

首先要先感謝 http://engyfun.blogspot.tw/2015/02/here-is-source-code-for-our-28byj48.html 所提供的ULN2003 driver library source code

Arduino的driver header and Cpp 檔案可以放到如下之位置

路徑是在你安裝Arduino的資料夾裡的\libraries，資料夾名稱可以自己命名，完成之後便可以在Arduino裡看到我們剛剛丟進去的driver並且匯入使用了

這時候我們就可以在我們的Arduino code裡面使用#include <StepperMotor.h>
來使用我們剛剛的driver了


Arduino code 如下
主要功能為可以由console輸入需要旋轉的角度以及輸出旋轉角度，完成之後回復原狀
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#include <StepperMotor.h>
// ULN2003 Motor Driver
StepperMotor motor(8,9,10,11);// IN1, IN2, IN3, IN4
float Speed = 2.0; // motor gets slower as this number increases
float Steps = 4076.0; // 4076 is approx 360 degrees
// maximum speed about 15RPM at 5 volts with an Arduino
float Delay = 1000.0; // delay in ms for next round
float n ; //dgree of motor 
String inString = ""; // string to hold input
#define led 13 // onboard led

void setup(){
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW); // turn off LED
  motor.setStepDuration(Speed);
}

void loop(){
  // motor turn clockwise
  digitalWrite(led, HIGH); 
  inString = "";// clean forword input
  while (Serial.available() > 0) {
    int inChar = Serial.read();
    if (inChar != '\n') { 
      // As long as the incoming byte
      // is not a newline,
      // convert the incoming byte to a char
      // and add it to the string
      inString += (char)inChar;
    }
    n = inString.toFloat();
  }
  Serial.print("turn clockwise degree:");
  Serial.println(n);
  motor.step(Steps*n/360.0);
  delay(Delay);
  // reverse motor
  digitalWrite(led, LOW); // shows reverse rotation
  Serial.print("turn clockwise degree:");
  Serial.println(-n);
  motor.step(-Steps*n/360.0);
  delay(Delay);

}

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