arduino
// 定义控制LED的引脚数组

int num = 100;
const int ledPins[] = {16, 5, 4, 0, 2};
// 计算引脚的数量，方便循环遍历
const int ledCount = sizeof(ledPins) / sizeof(ledPins[0]);
const int state[] = {2, 2, 2, 2, 2, 2, 2, 1, 0, 2, 2, 1, 2, 0, 2,

                     2, 1, 0, 2, 2, 2, 0, 1, 2, 2, 2, 2, 0, 1, 2, 2, 0, 2,
                     1, 2, 2, 0, 2, 2, 1, 2, 2, 0, 2, 1, 2, 2, 2, 0, 1,

                     1, 0, 2, 2, 2, 0, 1, 2, 2, 2, 1, 2, 0, 2, 2, 0, 2, 1,
                     2, 2, 1, 2, 2, 0, 2, 0, 2, 2, 1, 2, 0, 2, 2, 2, 1

};
void setstate(int data)
{

    for (int i = 0; i < ledCount; i++)
    {
        if (state[data * 5 + i] == 1)
        {
            pinMode(ledPins[i], OUTPUT);
            digitalWrite(ledPins[i], HIGH);
        }
        else if (state[data * 5 + i] == 0)
        {
            pinMode(ledPins[i], OUTPUT);
            digitalWrite(ledPins[i], LOW);
        }
        else if (state[data * 5 + i] == 2)
        {
            pinMode(ledPins[i], INPUT);
            digitalWrite(ledPins[i], LOW);
        }
        else if (state[data * 5 + i] == 3)
        {
            pinMode(ledPins[i], INPUT);
            digitalWrite(ledPins[i], HIGH);
        }
    }
    delay(1);
}
void setup()
{
    // 遍历数组，将所有LED引脚设置为输出模式
    for (int i = 0; i < ledCount; i++)
    {
        pinMode(ledPins[i], OUTPUT);
        // 初始状态设为高电平（熄灭），防止上电瞬间误亮
        digitalWrite(ledPins[i], HIGH);
    }

    Serial.begin(115200);
}

void loop()
{
    int num100, num10, num1;
    num100 = (num / 100) % 10;
    num10 = (num / 10) % 10;
    num1 = num % 10;
    
    if ((num100) == 1)
    {
        setstate(1);
    }
    if ((num100) == 1)
    {
        setstate(2);
    }
    if ((num10 == 0) || (num10 == 2) || (num10 == 3) || (num10 == 5) ||
        (num10 == 6) || (num10 == 7) || (num10 == 8) || (num10 == 9))
    {
      if(num>9)setstate(3);
    }
    if ((num10 == 0) || (num10 == 1) || (num10 == 2) || (num10 == 3) ||
        (num10 == 4) || (num10 == 7) || (num10 == 8) || (num10 == 9))
    {
        if(num>9)setstate(4);
    }
    if ((num10 == 0) || (num10 == 1) || (num10 == 3) || (num10 == 4) ||
        (num10 == 5) || (num10 == 6) || (num10 == 7) || (num10 == 8) ||
        (num10 == 9))
    {
        if(num>9)setstate(5);
    }
    if ((num10 == 0) || (num10 == 2) || (num10 == 3) || (num10 == 5) ||
        (num10 == 6) || (num10 == 8) || (num10 == 9))
    {
        if(num>9)setstate(6);
    }
    if ((num10 == 0) || (num10 == 2) || (num10 == 6) || (num10 == 8))
    {
        if(num>9)setstate(7);
    }
    if ((num10 == 0) || (num10 == 4) || (num10 == 5) || (num10 == 6) ||
        (num10 == 8) || (num10 == 9))
    {
        if(num>9)setstate(8);
    }
    if ((num10 == 2) || (num10 == 3) || (num10 == 4) || (num10 == 5) ||
        (num10 == 6) || (num10 == 8) || (num10 == 9))
    {
        if(num>9)setstate(9);
    }

    if ((num1 == 0) || (num1 == 2) || (num1 == 3) || (num1 == 5) ||
        (num1 == 6) || (num1 == 7) || (num1 == 8) || (num1 == 9))
    {
        setstate(10);
    }
    if ((num1 == 0) || (num1 == 1) || (num1 == 2) || (num1 == 3) ||
        (num1 == 4) || (num1 == 7) || (num1 == 8) || (num1 == 9))
    {
        setstate(11);
    }
    if ((num1 == 0) || (num1 == 1) || (num1 == 3) || (num1 == 4) ||
        (num1 == 5) || (num1 == 6) || (num1 == 7) || (num1 == 8) ||
        (num1 == 9))
    {
        setstate(12);
    }
    if ((num1 == 0) || (num1 == 2) || (num1 == 3) || (num1 == 5) ||
        (num1 == 6) || (num1 == 8) || (num1 == 9))
    {
        setstate(13);
    }
    if ((num1 == 0) || (num1 == 2) || (num1 == 6) || (num1 == 8))
    {
        setstate(14);
    }
    if ((num1 == 0) || (num1 == 4) || (num1 == 5) || (num1 == 6) ||
        (num1 == 8) || (num1 == 9))
    {
        setstate(15);
    }
    if ((num1 == 2) || (num1 == 3) || (num1 == 4) || (num1 == 5) ||
        (num1 == 6) || (num1 == 8) || (num1 == 9))
    {
        setstate(16);
    }
    if (Serial.available() > 0)
    {
        // parseInt() 会读取串口数据中的第一个有效整数
        // 它会自动跳过10非数字字符（比如回车、换行符）
        num = Serial.parseInt();

        // 在这里你可以把 num 传递给数码管显示函数
        // 例如：displayNumber(num);
    }
}