这是个arduino计时器程序，这个程序可以调整计时器进行倒计时，可以设置倒计时时间。
一共两个按钮，两个电位器，三个led灯。
两个按钮其中一个控制计时开始和计时结束，另一个按钮循环移位时分秒设置，按下之后可以设置当前的计时，时分秒依次设置。
两个电位器，一个调节1602屏幕亮度，另一个设置计时器时间。
3个led灯，一个2秒闪一次，一个一分钟闪两次，一个一小时闪两次。
代码：
//include file
#include <LiquidCrystal.h>
//define a pin to control beep
#define buzzer_pin 6
//define a pin to detect key signal
//when you press the key which controled by key1,the timer start work
#define key1 7
//when you press the key which controled by key1,you could set the timer
#define key2 13
//define the pin to control led
//second
#define led_s 8
//minite
#define led_m 9
//hour
#define led_h 10
//led HIHG time
#define lit 100
//define a lcd object
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
//the int to save timer goal
//second goal
unsigned int seco_g=30;
//minite goal
unsigned int mini_g=1;
//hour goal
unsigned int hour_g=0;
unsigned long seco_sum=0;
//define the now time
//second
unsigned int seco=0;
//minite
unsigned int mini=0;
//hour
unsigned int hour=0;
unsigned long seco_sum_pre=0;
unsigned long seco_pre=0;
unsigned long mini_pre=0;
unsigned long hour_pre=0;
bool fi_s=false;
//set bit
//0 for second 1 for minite 2 for hour
unsigned int swit=0;
//set timer mode，0，1
bool swit_s=false;
//the timer status
bool js_status=false;
//detect key1
bool anjian1(){
if(digitalRead(key1)==HIGH)
{
delay(10);
if(digitalRead(key1)==HIGH)
return true;
else
return false;
}
return false;
};
//detect key2
bool anjian2(){
if(digitalRead(key2)==HIGH)
{
delay(10);
if(digitalRead(key2)==HIGH)
return true;
else
return false;
}
return false;
};
void display_t()
{
hour=seco_sum/3600;
mini=(seco_sum-hour*3600)/60;
seco=seco_sum-hour*3600-mini*60;
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Arduino Timer");
lcd.setCursor(0, 1);
lcd.print(hour);
lcd.setCursor(2, 1);
lcd.print(":");
lcd.setCursor(3, 1);
lcd.print(mini);
lcd.setCursor(5, 1);
lcd.print(":");
lcd.setCursor(6, 1);
lcd.print(seco);
}
void setup()
{
//初始化引脚
for(int i=2;i<=6;i++)
{
pinMode(i,OUTPUT);
digitalWrite(i,LOW);
}
pinMode(7,INPUT);
for(int i=8;i<=12;i++)
{
pinMode(i,OUTPUT);
digitalWrite(i,LOW);
}
pinMode(13,INPUT);
//初始化串口
Serial.begin(115200);
lcd.begin(16, 2); // 启动与LCD键盘的通信
lcd.setCursor(0,0);
lcd.print("Arduino-");
lcd.setCursor(0, 1);
lcd.print(" Timer");
delay(3000);
Serial.println("Init suss！");
seco_sum=hour*3600+mini*60+seco;
display_t();
}
void loop(){
if((anjian1()==true)&&(js_status==false))
{
seco=seco_g;
mini=mini_g;
hour=hour_g;
js_status=true;
seco_sum_pre=millis();
seco_pre=millis();
mini_pre=millis();
hour_pre=millis();
}
else if((anjian1()==true)&&(js_status==true))
js_status=false;
//if the timer not work ,you can set the timer'goal
if(js_status==false)
{
if(anjian2()==true)
{
if((swit_s==false)||(swit==2))
swit=0;
else
swit++;
swit_s=true;
}
if(swit_s==true)
{
//set the timer's goal
if(swit==0)
{
if(hour_g!=map(analogRead(A0),0,1023,0,24))
lcd.clear();
hour_g=map(analogRead(A0),0,1023,0,24);
}
else if(swit==1)
{
if(mini_g!=map(analogRead(A0),0,1023,0,59))
lcd.clear();
mini_g=map(analogRead(A0),0,1023,0,59);
}
else if(swit==2)
{
if(seco_g!=map(analogRead(A0),0,1023,0,59))
lcd.clear();
seco_g=map(analogRead(A0),0,1023,0,59);
}
//lcd.clear();
//set mode
lcd.setCursor(0,0);
lcd.print("Set mode-");
lcd.setCursor(0, 1);
lcd.print(hour_g);
lcd.setCursor(2, 1);
lcd.print(":");
lcd.setCursor(3, 1);
lcd.print(mini_g);
lcd.setCursor(5, 1);
lcd.print(":");
lcd.setCursor(6, 1);
lcd.print(seco_g);
}
}
if(js_status==true)
{
seco_sum=hour*3600+mini*60+seco;
if(seco_sum>0)
{
if((millis()-seco_sum_pre)>=1000)
{
seco_sum--;
display_t();
seco_sum_pre=millis();
}
if((millis()-seco_pre)>=2000)
{
seco_pre=millis();
digitalWrite(led_s,HIGH);
delay(100);
digitalWrite(led_s,LOW);
}
if((millis()-mini_pre)>=60000)
{
mini_pre=millis();
digitalWrite(led_m,HIGH);
delay(100);
digitalWrite(led_m,LOW);
delay(100);
digitalWrite(led_m,HIGH);
delay(100);
digitalWrite(led_m,LOW);
}
if((millis()-hour_pre)>=3600000)
{
hour_pre=millis();
digitalWrite(led_h,HIGH);
delay(100);
digitalWrite(led_h,LOW);
delay(100);
digitalWrite(led_h,HIGH);
delay(100);
digitalWrite(led_h,LOW);
}
}
else
{
if(fi_s==false)
{
lcd.clear();
fi_s=true;
}
else;
lcd.setCursor(0,0);
digitalWrite(buzzer_pin,HIGH);
lcd.print("Timer finished!");
}
}
}
