（8）趣味单片机新玩法-多个数码管扫描显示

2025-03-25 来源：jianshu

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 // Required by cpu#include #pragma GCC pop_options// Peripheral ConstructorsCPU &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)

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);}

总结

复杂的原理来自多年实验的总结，同样也来自生活实践。

进入单片机查看更多内容>>

趣味单片机数码管扫描显示

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