Arduino：for 循环在 while 循环中不起作用

Question

我有一组LED，一共12个：6个蓝色，6个红色。我有 for 循环，有助于在设定的时间间隔打开和关闭 LED 的混乱。但现在我想让它有 while 循环来控制 LED 速度变化的时间。到目前为止我已经制作了 2 个并且它们都可以工作但是第二个我将 for 循环放在里面它没有做任何事情。

int redLEDPins[] = {2,3,4,5,6,7};
int blueLEDPins[] = {8,9,10,11,12,13};
int LED_Amount = 6;
int led_delay = 1000;

unsigned long time_since_last_reset = 0;
int wail = 5000;
int yelp = 3000;
int phaser = 3000;
int hilo = 3000;

void setup() {
  for (int i; i < LED_Amount; i++) {
    pinMode(redLEDPins[i], OUTPUT);
    pinMode(blueLEDPins[i], OUTPUT);
  }
  Serial.begin(9600);
}

void loop() {
  //wail while loop
  time_since_last_reset = millis();
  while((millis() - time_since_last_reset) < wail) {
    led_delay = 250;
    Serial.print("delay: ");
    Serial.println(led_delay);
    digitalWrite(2, HIGH);
    delay(500);
    digitalWrite(2, LOW);
    delay(500);
  }

  //yelp while loop
  time_since_last_reset = millis();
  while((millis() - time_since_last_reset) < wail){
    led_delay = 50;
    Serial.print("delay: ");
    Serial.println(led_delay);
    for (int i; i < LED_Amount; i++) {
      digitalWrite(redLEDPins[i], HIGH);
      digitalWrite(blueLEDPins[i], LOW);
      Serial.println("Red on ");
      Serial.println("Blue off");
    }
    delay(led_delay);
    for (int i; i < LED_Amount; i++){
    digitalWrite(redLEDPins[i], LOW);
    digitalWrite(blueLEDPins[i], HIGH);
    Serial.println("Red off ");
    Serial.println("Blue on");
    }
    delay(led_delay);
  }
}

Answer 1

for (**int i**; i < LED_Amount; i++){
  digitalWrite(redLEDPins[i],LOW);
  digitalWrite(blueLEDPins[i],HIGH);
  Serial.println("Red off ");
  Serial.println("Blue on");
}

可能是因为你没有初始化 i？

Arduino：for 循环在 while 循环中不起作用

Arduino: for loop not working inside of while loop

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