[嵌入式]Arduino Uno驱动四位数码管

Arduino Uno驱动四位数码管

我用的是 四位共阳极数码管
型号是5461BS-1数码管

接线方法

程序源码

我写了个倒计时

#define d_a 7 //定义数码管a 接引脚 2
#define d_b 8
#define d_c 9
#define d_d 10
#define d_e 11
#define d_f 12
#define d_g 13
#define d_h 2

#define COM1 3 //定义 第一组数码管 com1 接引脚2
#define COM2 4
#define COM3 5
#define COM4 6

//数码管0-9码值 这个是共阳极的和共阴的不一样
unsigned char num[10][8] =
    {
        // a  b  c  d  e  f  g  h 定义0-9的编码
        {0, 0, 0, 0, 0, 0, 1, 1}, // 0
        {1, 0, 0, 1, 1, 1, 1, 1}, // 1
        {0, 0, 1, 0, 0, 1, 0, 1}, // 2
        {0, 0, 0, 0, 1, 1, 0, 1}, // 3
        {1, 0, 0, 1, 1, 0, 0, 1}, // 4
        {0, 1, 0, 0, 1, 0, 0, 1}, // 5
        {0, 1, 0, 0, 0, 0, 0, 1}, // 6
        {0, 0, 0, 1, 1, 1, 1, 1}, // 7
        {0, 0, 0, 0, 0, 0, 0, 1}, // 8
        {0, 0, 0, 0, 1, 0, 0, 1}, // 9
};

void setup()
{
    pinMode(d_a, OUTPUT); //设置为输出引脚
    pinMode(d_b, OUTPUT);
    pinMode(d_c, OUTPUT);
    pinMode(d_d, OUTPUT);
    pinMode(d_e, OUTPUT);
    pinMode(d_f, OUTPUT);
    pinMode(d_g, OUTPUT);
    pinMode(d_h, OUTPUT);

    pinMode(COM1, OUTPUT);
    pinMode(COM2, OUTPUT);
    pinMode(COM3, OUTPUT);
    pinMode(COM4, OUTPUT);
}

void loop()
{
    for (int n = 500; n >= 0; n--)
    {
        if (n == 500)
        {
            for (int q = 0; q < 125; q++)
            {
                delay(20);
                Display(4, 0);
                delay(5);
                Display(2, 5); //第1位数码管显示l的值
                delay(5);
                Display(3, 0);
                delay(5);
            }
        }
        int ge = n / 1 % 10;
        int shi = n / 10 % 10;
        int bai = n / 100 % 10;
        for (int q = 0; q < 125; q++)
        {
            Display(2, bai); //第1位数码管显示l的值
            delay(2);
            Display(3, shi);
            delay(2);
            Display(4, ge);
            delay(4);
        }
    }
}

int pos[4][4] = {
    {1, 0, 0, 0},
    {0, 1, 0, 0},
    {0, 0, 1, 0},
    {0, 0, 0, 1}
};

void show(int poss)
{
    for (int i = 0; i <= 4; i++)
    {
        digitalWrite(i + 3, pos[poss - 1][i]);
    }
}

void Display(unsigned char com, unsigned char n) //显示函数，com可选数值范围1-4，num可选数值范围0-9
{
    show(com);
    digitalWrite(d_a, HIGH); //去除余晖共阴用LOW
    digitalWrite(d_b, HIGH);
    digitalWrite(d_c, HIGH);
    digitalWrite(d_d, HIGH);
    digitalWrite(d_e, HIGH);
    digitalWrite(d_f, HIGH);
    digitalWrite(d_g, HIGH);
    digitalWrite(d_h, HIGH);

    digitalWrite(d_a, num[n][0]); // a查询码值表
    digitalWrite(d_b, num[n][1]);
    digitalWrite(d_c, num[n][2]);
    digitalWrite(d_d, num[n][3]);
    digitalWrite(d_e, num[n][4]);
    digitalWrite(d_f, num[n][5]);
    digitalWrite(d_g, num[n][6]);
    digitalWrite(d_h, num[n][7]);
}