【Arduino】交通灯控制设计四位数码管,4位数字倒计时，带蜂鸣器播放音乐，串口输入改变数码管数字前言一、实验器材二、连线示意图总结

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概述

【Arduino】交通灯控制设计四位数码管,4位数字倒计时，带蜂鸣器播放音乐，串口输入改变数码管数字

前言
一、实验器材
二、连线示意图
- 三、代码如下
- 2.实物连接图如下：
总结

【Arduino】交通灯控制设计四位数码管,4位数字倒计时，带蜂鸣器播放音乐，串口输入改变数码管数字
)

前言

一、实验器材

UNO控制板：1块

共阳极四位数码管：1个

面包板：1块

面包板跳线：若干

220Ω电阻：4个

1K电阻：3个
红色led灯-1
绿色led灯-1
黄色led灯-1

二、连线示意图

请添加图片描述注意：A5、A4、A3为红黄绿灯引脚端口，A0为蜂鸣器端口

三、代码如下

#define redLed A5//红灯引脚定义
#define yellowLed A4//黄灯引脚定义
#define greenLed A3//绿灯灯引脚定义
int speakerPin = A0; //蜂鸣器引脚定义
int numred=1;//红灯定时时间
int numgreen=2;//绿灯定时时间
int numyellow=3;//黄灯定时时间
char signal;
 //设置阴极接口
 int a = 2;       //从2号位开始连接的
 int b = 3;
 int c = 4;
 int d = 5;
 int e = 6;
 int f = 7;
 int g = 8;
 int p = 9;
 //设置阳极接口
 int d4 = 13;
 int d3 = 12;
 int d2 = 11;
 int d1 = 10;
 //设置变量
 long n = 0;
 int x = 100;

 
 int length = 15; // the number of notes 
char notes[] = "ccggaagffeeddc "; // a space represents a rest 
int beats[] = { 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 4 }; 
int tempo = 300; 

void playTone(int tone, int duration) { //蜂鸣器音色
  for (long i = 0; i < duration * 1000L; i += tone * 2) { 
    digitalWrite(speakerPin, HIGH); 
    delayMicroseconds(tone); 
    digitalWrite(speakerPin, LOW); 
    delayMicroseconds(tone); 
  } 
} 

void playNote(char note, int duration) { 
  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' }; 
  int tones[] = { 1915, 1700, 1519, 1432, 1275, 1136, 1014, 956 }; 

  // play the tone corresponding to the note name 
  for (int i = 0; i < 8; i++) { 
    if (names[i] == note) { 
      playTone(tones[i], duration); 
    } 
  } 
} 

void redchange(){
    if(signal=='A'){//修改红灯定时时间0~99s
  if(Serial.available()>0){
    numred=Serial.read()-48;
    if(Serial.available()>0){
    int zifu=Serial.read()-48;
    numred=numred*10+zifu;
    Serial.print("-->");
    Serial.println(numred);
  }
}
}
}
void greenchange(){
  if(signal=='B'){//修改绿灯定时时间0~99s
  if(Serial.available()>0){
    numgreen=Serial.read()-48;
    Serial.println(numgreen);
    if(Serial.available()>0){
    int zifu=Serial.read()-48;
    numgreen=numgreen*10+zifu;
    Serial.print("-->");
    Serial.println(numgreen);
  }
}
}
}
void yellowchange(){
  if(signal=='C'){//修改黄灯定时时间0~99s
  if(Serial.available()>0){
    numyellow=Serial.read()-48;
    Serial.println(numyellow);
    if(Serial.available()>0){
    int zifu=Serial.read()-48;
    numyellow=numyellow*10+zifu;
    Serial.print("-->");
    Serial.println(numyellow);
  }
 }
}
  }
 void fengmingqiplay(){
    for (int i = 0; i < length; i++) { 
    if (notes[i] == ' ') { 
      delay(beats[i] * tempo); // rest 
    } else { 
      playNote(notes[i], beats[i] * tempo); 
    } 

    // pause between notes 
    delay(tempo / 2);  
  }
  }
 void ledchange(){
   if(Serial.available()>0){
   signal=Serial.read();
    Serial.print(signal);
    redchange();
    greenchange();
    yellowchange();
  }
  }
 void setup()
 {
   Serial.begin(9600);  //设置串口波特率
   while (!Serial){}
   pinMode(d1, OUTPUT); //把对应的LED都设置成输出
   pinMode(d2, OUTPUT);
   pinMode(d3, OUTPUT);
   pinMode(d4, OUTPUT);
   pinMode(a, OUTPUT);
   pinMode(b, OUTPUT);
   pinMode(c, OUTPUT);
   pinMode(d, OUTPUT);
   pinMode(e, OUTPUT);
   pinMode(f, OUTPUT);
   pinMode(g, OUTPUT);
   pinMode(p, OUTPUT);
   pinMode(redLed, OUTPUT);
   pinMode(greenLed, OUTPUT);
   pinMode(yellowLed, OUTPUT);
    Serial.println("请您选择你要修改的灯的颜色");
    Serial.println("【A是绿灯】");
    Serial.println("【B是红灯】");
    Serial.println("【C是黄灯】");
   pinMode(speakerPin, OUTPUT); 

 }
String inString="";
void loop(){
attachInterrupt(digitalPinToInterrupt(0), ledchange, FALLING ); 
  ledchange();
  interrupts(); 
  digitalWrite(redLed,HIGH);
  for(int i=numred;i>=0;i--){
    for(int k=250;k>0;k--){
    Display(4,i%10);//调整个位的数字变化
    Display(3,i/10%10);//调整十位的数字变化 
    Display(2,i%1000/100);//调整百位的数字变化 
    Display(1,i/1000); //调整千位的数字变化 
    }     
  }
  digitalWrite(redLed,LOW);
  digitalWrite(yellowLed,HIGH);
  for(int i=numyellow;i>=0;i--){
    for(int k=250;k>0;k--){
    Display(4,i%10);//调整个位的数字变化
    Display(3,i/10%10);//调整十位的数字变化 
    Display(2,i%1000/100);//调整百位的数字变化 
    Display(1,i/1000); //调整千位的数字变化 
    }
  }
  digitalWrite(yellowLed,LOW);
  //fengmingqiplay();

  digitalWrite(greenLed,HIGH);
  for(int i=numgreen;i>=0;i--){
    for(int k=250;k>0;k--){
    Display(4,i%10);//调整个位的数字变化
    Display(3,i/10%10);//调整十位的数字变化 
    Display(2,i%1000/100);//调整百位的数字变化 
    Display(1,i/1000); //调整千位的数字变化 
    }
  }
  digitalWrite(greenLed,LOW);
}
///
void shumaguan(unsigned char n)//
{
  switch(n)
  {
     case 1: 
      digitalWrite(d1,HIGH);
      digitalWrite(d2, LOW);
      digitalWrite(d3, LOW);
      digitalWrite(d4, LOW);   
      break;
     case 2: 
      digitalWrite(d1, LOW);
      digitalWrite(d2, HIGH);
      digitalWrite(d3, LOW);
      digitalWrite(d4, LOW); 
      break;
      case 3: 
       digitalWrite(d1,LOW);
       digitalWrite(d2, LOW);
       digitalWrite(d3, HIGH);
       digitalWrite(d4, LOW); 
       break;
      case 4: 
       digitalWrite(d1, LOW);
       digitalWrite(d2, LOW);
       digitalWrite(d3, LOW);
       digitalWrite(d4, HIGH); 
       break;
       default :
       digitalWrite(d1, LOW);
       digitalWrite(d2, LOW);
       digitalWrite(d3, LOW);
       digitalWrite(d4, LOW);
       break;
      }
}
void Num_0()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, HIGH);
  digitalWrite(p,HIGH);
}
void Num_1()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(p,HIGH);
}
void Num_2()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, HIGH);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_3()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_4()
{
  digitalWrite(a, HIGH);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_5()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_6()
{
  digitalWrite(a, LOW);
  digitalWrite(b, HIGH);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_7()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(p,HIGH);
}
void Num_8()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, LOW);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Num_9()
{
  digitalWrite(a, LOW);
  digitalWrite(b, LOW);
  digitalWrite(c, LOW);
  digitalWrite(d, LOW);
  digitalWrite(e, HIGH);
  digitalWrite(f, LOW);
  digitalWrite(g, LOW);
  digitalWrite(p,HIGH);
}
void Clear()  //清屏
{
  digitalWrite(a, HIGH);
  digitalWrite(b, HIGH);
  digitalWrite(c, HIGH);
  digitalWrite(d, HIGH);
  digitalWrite(e, HIGH);
  digitalWrite(f, HIGH);
  digitalWrite(g, HIGH);
  digitalWrite(p,HIGH);
}
void pickNumber(unsigned char n)
{
  switch(n)
  {
   case 0:Num_0();
   break;
   case 1:Num_1();
   break;
   case 2:Num_2();
   break;
   case 3:Num_3();
   break;
   case 4:Num_4();
   break;
   case 5:Num_5();
   break;
   case 6:Num_6();
   break;
   case 7:Num_7();
   break;
   case 8:Num_8();
   break;
   case 9:Num_9();
   break;
   default:Clear();
   break; 
  }
}
void Display(unsigned char x, unsigned char Number)
{
  shumaguan(x);
  pickNumber(Number);
  delay(1);
  Clear() ; 
}

2.实物连接图如下：

请添加图片描述

总结

提示：这里对文章进行总结：
例如：以上就是今天要讲的内容，本文仅仅简单介绍了四位数码管的使用，一位数码管的控制，通过程序来使数码管点亮或熄灭，但是遇到多位数字，我们又该怎么显示就有所不同，所以，四位数码管的控制，四位数码管并不是简单的1+1+1+1的样子。

参考链接
1、https://blog.csdn.net/weixin_43319452/article/details/109361825
2、https://www.arduino.cn/forum.php?mod=viewthread&tid=106891&highlight=%E6%95%B0%E7%A0%81%E7%AE%A1
3、https://blog.csdn.net/weixin_33916256/article/details/91891142?utm_medium=distribute.pc_relevant.none-task-blog-2_defaultbaidujs_baidulandingword~default-5.pc_relevant_default&spm=1001.2101.3001.4242.4&utm_relevant_index=6