Arduino步进电机循环怪异行为

Question

I am using a stepper motor with my Arduino and to turn it clockwise i made a function that turns the voltage of the wires on one at a time. This works, however when i put the function in a loop it does not work.

The code is:

void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);  
}

void turnRight(int delayTime) {
  for(int i; i<=4; i++){
    digitalWrite(9+i, LOW);
    digitalWrite(10+i, HIGH);  
    delay(delayTime);
  } 
}

void turnLeft(int delayTime) {
  for(int i; i<=4; i++){
    digitalWrite(14-i, LOW);
    digitalWrite(13-i, HIGH);  
    delay(delayTime);
  }    
}

void loop() {

  int p=0;
  while(p<=100){
    turnRight(25);
    p++;

  }

}

The code makes the motor stutter, it goes left and right very quickly in kind of a vibrating motion, meaning the wires are probably turned on in the wrong order. However when i run this code:

void setup() {
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(11, OUTPUT);
  pinMode(10, OUTPUT);  
}

void turnRight(int delayTime) {
  for(int i; i<=4; i++){
    digitalWrite(9+i, LOW);
    digitalWrite(10+i, HIGH);  
    delay(delayTime);
  } 
}

void turnLeft(int delayTime) {
  for(int i; i<=4; i++){
    digitalWrite(14-i, LOW);
    digitalWrite(13-i, HIGH);  
    delay(delayTime);
  }    
}

void loop() {

  int p=0;
  while(p<=100){
    turnRight(25);

  }

}

It does work, the motor runs smoothly and it does not stutter, the only difference is that i don't increment p in this code. Using a for-loop gives the same effect, incrementing the for-loop value makes the motor stutter.

Answer 1

在函数turnRight和turnLeft ，for循环尚未使用int i=0类的特定值初始化。我认为这是引起问题的部分。