实验现象
在Arduino开发板上设计红黄绿Led灯定时循环同步数码管显示，以数码管时间显示进行定时循环控制，要求红绿灯定时15秒，黄灯定时5秒。并在此基础之上设计串口通信键盘输入变量进行红黄绿LED灯定时修改（修改定时范围0~99秒）。
实验准备
arduino主板-1
面包板-1
数据线-1
四位数码管-1
220Ω电阻-3
红色led灯-1
绿色led灯-1
黄色led灯-1
跳线若干
连接电路
接线说明
实物连接图
实验代码
#define redLed A5//红灯引脚定义
#define greeLed A4//绿灯引脚定义
#define yelloLed A3//黄灯灯引脚定义
int numred=14;//红灯定时时间15s
int numgree=14;//绿灯定时时间15s
int numyello=4;//黄灯定时时间5s
char signal;
//设置阴极接口
int a = 2;
int b = 3;
int c = 4;
int d = 5;
int e = 6;
int f = 7;
int g = 8;
int dp = 9;
//设置阳极接口
int d4 = 1;
int d3 = 0;
int d2 = 11;
int d1 = 10;
//设置变量
long n = 1230;
int x = 100;
int del = 55; //此处数值对时钟进行微调
void setup()
{
Serial.begin(9600);
pinMode(d1, OUTPUT);
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(dp, OUTPUT);
pinMode(redLed, OUTPUT);
pinMode(greeLed, OUTPUT);
pinMode(yelloLed, OUTPUT);
}
/
void loop(){
if(Serial.available()>0){
signal=Serial.read();
Serial.print(signal);
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);
}
}
}
if(signal=='B'){
//修改绿灯定时时间0~99s
if(Serial.available()>0){
numgree=Serial.read()-48;
Serial.println(numgree);
if(Serial.available()>0){
int zifu=Serial.read()-48;
numgree=numgree*10+zifu;
Serial.println(numgree);
}
}
}
if(signal=='C'){
//修改黄灯定时时间0~99s
if(Serial.available()>0){
numyello=Serial.read()-48;
Serial.println(numyello);
if(Serial.available()>0){
int zifu=Serial.read()-48;
numyello=numyello*10+zifu;
Serial.println(numyello);
}
}
}
}
digitalWrite(redLed,HIGH);
for(int i=numred;i>=0;i--){
for(int k=500;k>0;k--){
Display(1,i/10);
Display(2, i%10);
}
}
digitalWrite(redLed,LOW);
digitalWrite(yelloLed,HIGH);
for(int i=numyello;i>=0;i--){
for(int k=500;k>0;k--){
Display(1,i/10);
Display(2, i%10);
}
}
digitalWrite(yelloLed,LOW);
digitalWrite(greeLed,HIGH);
for(int i=numgree;i>=0;i--){
for(int k=500;k>0;k--){
Display(1,i/10);
Display(2, i%10);
}
}
digitalWrite(greeLed,LOW);
}
///
void WeiXuan(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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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(dp,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)
{
WeiXuan(x);
pickNumber(Number);
delay(1);
Clear() ;
}
实现效果
红黄绿Led灯定时循环同步数码管显示，红绿灯定时15s，黄灯定时5s。
通过串口监视器输入变量，对红黄绿Led灯定时修改。
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