（8）趣味单片机新玩法-多个数码管扫描显示

作者: 想啥做啥 | 来源:发表于2021-03-20 22:51 被阅读0次

（8）趣味单片机新玩法-多个数码管扫描显示
8位数码管显示时间（proteus）
STC15数码管显示学号
MHT5-交通灯套件
2017/1
51单片机显示数码管（静态和动态，示列代码）
51单片机显示数码管（静态和动态，示列代码）
项目8（任务10）利用四位数码管实现动态扫描显示（一）
【项目08-任务11-小组4】利用四位数码管实现动态扫描显示（一
单片机基础/2020-03-19

我们先来看第一个效果，数码管以秒计数显示

动态效果图

老套路，我们接下来进行分解，我们首先第一步就是让每个数码管都可控，不知道怎么使用74HC595的可以参考之前写的文章

代码：

/* Main.ino file generated by New Project wizard
 *
 * Created:   周六 3月 20 2021
 * Processor: Arduino Uno
 * Compiler:  Arduino AVR (Proteus)
 */

// Peripheral Configuration Code (do not edit)
//---CONFIG_BEGIN---
#pragma GCC push_options
#pragma GCC optimize ("Os")

#include <core.h> // Required by cpu
#include <cpu.h>

#pragma GCC pop_options

// Peripheral Constructors
CPU &cpu = Cpu;

void peripheral_setup () {
}

void peripheral_loop() {
}
//---CONFIG_END---

int STCP_Pin = 6;
int SHCP_Pin = 4;
int DS_Pin = 5; 

 char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void setup () {
peripheral_setup();
// TODO: put your setup code here, to run once:
    pinMode(STCP_Pin,OUTPUT);
    pinMode(SHCP_Pin,OUTPUT);
    pinMode(DS_Pin,OUTPUT);

}

void loop() {
peripheral_loop();


// TODO: put your main code here, to run repeatedly:

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);


    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xEF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[1]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xF7);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[2]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFB);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[3]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFD);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[4]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFE);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[5]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(500);

}

我们接下来把速度提一提，延时改成50ms

感觉还是有点慢，我们再提点速度，改成10ms

但是，感觉显示有点乱，我们尝试在每个数码管显示过后给它关闭，在电视机邻域有个专业的名词叫消隐

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(10);
    // 消隐
    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
    digitalWrite(STCP_Pin,HIGH); 
    delay(1);

我们再来看下效果，是不是没有乱码了，之前因为没有关闭，由于人眼的余晖效应，会造成乱码

然后我们稍微再提点速度≥50Hz的刷新率，6个数码管，每个耗时3ms，这样整个下来的总时间是18ms，基本上就不会看到闪烁。

    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
    digitalWrite(STCP_Pin,HIGH); 
    delay(2);
    // 消隐
    digitalWrite(STCP_Pin,LOW); 
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
    shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
    digitalWrite(STCP_Pin,HIGH); 
    delay(1);

18ms刷新的效果，基本看不到闪烁的变化

文章开头效果总代码：

/* Main.ino file generated by New Project wizard
 *
 * Created:   周六 3月 20 2021
 * Processor: Arduino Uno
 * Compiler:  Arduino AVR (Proteus)
 */

// Peripheral Configuration Code (do not edit)
//---CONFIG_BEGIN---
#pragma GCC push_options
#pragma GCC optimize ("Os")

#include <core.h> // Required by cpu
#include <cpu.h>

#pragma GCC pop_options

// Peripheral Constructors
CPU &cpu = Cpu;

void peripheral_setup () {
}

void peripheral_loop() {
}
//---CONFIG_END---

int STCP_Pin = 6;
int SHCP_Pin = 4;
int DS_Pin = 5; 

 char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};

void setup () {
peripheral_setup();
// TODO: put your setup code here, to run once:
    pinMode(STCP_Pin,OUTPUT);
    pinMode(SHCP_Pin,OUTPUT);
    pinMode(DS_Pin,OUTPUT);

}


int count = 0;
int sec = 0;
void loop() {
peripheral_loop();

    count++;
    if(count>50)
    {
        count=0;
        sec++;
        if(sec>10)sec=0;
    }
    // TODO: put your main code here, to run repeatedly:

        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        // 消隐
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);


        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xEF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);

        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xF7);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);

        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFB);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);

        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFD);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);

        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFE);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
        digitalWrite(STCP_Pin,HIGH); 
        delay(2);
        digitalWrite(STCP_Pin,LOW); 
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
        shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
        digitalWrite(STCP_Pin,HIGH); 
        delay(1);
}