求一个arduino用四位共阴数码管显示数字从0到9999的代码

Question

求一个arduino用四位共阴数码管显示数字从0到9999的代码

Answer 1

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// 定义数码管引脚
int digitPins[] = {2, 3, 4, 5};
int segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};

// 数码管显示的数字
int num = 0;

void setup() {
  // 初始化引脚
  for (int i = 0; i < 4; i++) {
    pinMode(digitPins[i], OUTPUT);
  }
  for (int i = 0; i < 8; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }
}

void loop() {
  // 数码管显示数字
  displayNumber(num);
  
  // 数字递增
  num++;
  if (num > 9999) {
    num = 0;
  }
  
  // 延迟1秒
  delay(1000);
}

// 数码管显示函数
void displayNumber(int number) {
  // 将数字拆分成个位、十位、百位和千位
  int digit[4];
  digit[0] = number % 10;
  digit[1] = (number / 10) % 10;
  digit[2] = (number / 100) % 10;
  digit[3] = (number / 1000) % 10;
  
  // 显示数字
  for (int i = 0; i < 4; i++) {
    // 选中对应的数码管
    digitalWrite(digitPins[i], LOW);
    
    // 设置段选引脚状态
    for (int j = 0; j < 8; j++) {
      digitalWrite(segmentPins[j], HIGH);
    }
    
    // 显示对应的数字
    switch (digit[i]) {
      case 0:
        digitalWrite(segmentPins[6], LOW);
        break;
      case 1:
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[2], LOW);
        break;
      case 2:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[6], LOW);
        digitalWrite(segmentPins[4], LOW);
        digitalWrite(segmentPins[3], LOW);
        break;
      case 3:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[6], LOW);
        digitalWrite(segmentPins[2], LOW);
        digitalWrite(segmentPins[3], LOW);
        break;
      case 4:
        digitalWrite(segmentPins[5], LOW);
        digitalWrite(segmentPins[2], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[6], LOW);
        break;
      case 5:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[5], LOW);
        digitalWrite(segmentPins[6], LOW);
        digitalWrite(segmentPins[2], LOW);
        digitalWrite(segmentPins[3], LOW);
        break;
      case 6:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[5], LOW);
        digitalWrite(segmentPins[6], LOW);
        digitalWrite(segmentPins[4], LOW);
        digitalWrite(segmentPins[3], LOW);
        digitalWrite(segmentPins[2], LOW);
        break;
      case 7:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[2], LOW);
        break;
      case 8:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[2], LOW);
        digitalWrite(segmentPins[3], LOW);
        digitalWrite(segmentPins[4], LOW);
        digitalWrite(segmentPins[5], LOW);
        digitalWrite(segmentPins[6], LOW);
        break;
      case 9:
        digitalWrite(segmentPins[0], LOW);
        digitalWrite(segmentPins[1], LOW);
        digitalWrite(segmentPins[2], LOW);
        digitalWrite(segmentPins[5], LOW);
        digitalWrite(segmentPins[6], LOW);
        digitalWrite(segmentPins[3], LOW);
        break;
    }
    
    // 延迟一段时间
    delay(1);
    
    // 关闭数码管
    for (int j = 0; j < 8; j++) {
      digitalWrite(segmentPins[j], HIGH);
    }
    digitalWrite(digitPins[i], HIGH);
  }
}