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• Question
• Project 2

110V-220V to 12V(5A) transformer ; ULN2003(H-Bridge, voltage up to 12V); stepper motor

clockwise

//arduino IDE's Stepper.h library
#include <Stepper.h>
// 100 steps per round(旋转一圈多少步，依据步距角计算，及走一圈需要多少脉冲
//#define STEPS 100 ...or... const int STEPS = 100;
#define STEPS 100
//stepper's pin（IN1～IN4，digital）
Stepper stepper(STEPS, 8, 9, 10, 11);
int stepCount = 0;

void setup()
{ // 400 steps per minute
  stepper.setSpeed(400);
  Serial.begin(9600);
}

void loop()
{ stepper.step(50);
  delay(500);
}

clockwise + counterclockwise

//arduino IDE's Stepper.h library
#include <Stepper.h>
// 100 steps per round(旋转一圈多少步，依据步距角计算，及走一圈需要多少脉冲
//#define STEPS 100 ...or... const int STEPS = 100;
#define STEPS 100
//stepper's pin（IN1～IN4，digital）
Stepper stepper(STEPS, 8, 9, 10, 11);
int stepCount1 = 0;
int stepCount2 = 0;

void setup()
{ // 400 steps per minute
  stepper.setSpeed(400);
  Serial.begin(9600);
}

void loop()
{

  // clockwise（顺时针旋转
  stepper.step(50);
  //  Serial.print("clockwise steps:");
  //  Serial.println(stepCount1);
  //  stepCount1++;
  delay(500);

  // counterclockwise（逆时针旋转
  stepper.step(-50);
  //  Serial.print("counterclockwise steps:");
  //  Serial.println(stepCount2);
  //  stepCount2++;
  delay(500);
}

//arduino IDE's Stepper.h library
#include <Stepper.h>
// 100 steps per round(旋转一圈多少步，依据步距角计算，及走一圈需要多少脉冲
//#define STEPS 100 ...or... const int STEPS = 100;
#define STEPS 100
//stepper's pin（IN1～IN4，digital）
Stepper stepper(STEPS, 8, 9, 10, 11);
int stepCount1 = 0;
int stepCount2 = 0;

void setup()
{ // 400 steps per minute
  stepper.setSpeed(400);
  Serial.begin(9600);
}

void loop()
{

  // clockwise（顺时针旋转
  stepper.step(50);
  //  Serial.print("clockwise steps:");
  //  Serial.println(stepCount1);
  //  stepCount1++;
  delay(500);

  // counterclockwise（逆时针旋转
  stepper.step(-50);
  //  Serial.print("counterclockwise steps:");
  //  Serial.println(stepCount2);
  //  stepCount2++;
  delay(500);
}

RPM: how many full turns the engine does every minute

• stepper.setSpeed(400);
  • setSpeed调用形式setSpeed(rpms)，这个是控制转述的函数，实际是脉冲频率，参数为每分钟电机转的步数。数值为正整数。该函数不会使电机旋转。
• step step(steps)，这个函数是使电机转过固定的步数，只有当电机转过指定步数之后才会执行该语句的下一条语句。参数应该是整数，正负号控制旋转方向。