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网上找来的程序，基于51单片机的倒计时装置，定时时间到后蜂鸣器鸣叫，倒计时结束，想添加一个控制继电器功能，就是计时开始继电器吸合，计时结束继电器释放，不知道怎么加，请各位大佬帮帮忙，在此谢过了！
以下是源码：
//======================================================================
//
// Copyright (C) 2020 Jobcrazy
// All rights reserved
//
//======================================================================
#include <reg52.h>
//Button registers
sbit Step1m = P3^6; //按键3，+1分钟
sbit Step10m = P3^5; //按键2，+10分钟
sbit Step1h = P3^4; //按键1，+1小时
sbit StepStart = P3^7; //按键4，开始计时
//Beep register
sbit Beep = P1^6; //蜂鸣器
//Relay
sbit Relay = P1^7; //继电器
//Time Led Dot register
sbit TIME_DOT = P1^5; //数码管":"
//Time Led Segment register
sbit ShuMa_Duan_0 = P1^0; //数码管1
sbit ShuMa_Duan_1 = P1^1; //数码管2
sbit ShuMa_Duan_2 = P1^2; //数码管3
sbit ShuMa_Duan_3 = P1^3; //数码管4
//Initial settings
#define DEFAULT_HOUR 00
#define DEFAULT_MINUTE 00
#define DEFAULT_SECOND 00
volatile int Hour = DEFAULT_HOUR;
volatile int Minute = DEFAULT_MINUTE;
volatile int Second = DEFAULT_SECOND;
//Led Number Definitions
code unsigned char ShuMa_Data[10] = {0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92,0x82,0xF8,0x80,0x90};
//Led Number Indexes
volatile int Shi_Left = 0;
volatile int Ge_Left = 0;
volatile int Shi_Right = 0;
volatile int Ge_Right = 0;
//Delay 1 minisecond
void Delay_1ms( int i )
{
for( ; i > 0; --i )
{
int j = 0;
for( ; j < 110; ++j )
{
}
}
}
//Timer Settings
void Init_Timer()
{
TMOD = 0x11; //Using timer 0 and timer 1
TH0 = 0xB8;
TL0 = 0x00; //Timer0 = 20ms
TH1 = 0xB8;
TL1 = 0x00; //Timer1 = 20ms
TR0 = 0x01; //Enable Timer 0
TR1 = 0x00;
}
//Enable Timer
void Init_Interrupt()
{
ET0 = 1;
ET1 = 1;
EA = 1;
}
//Show Number on the Timer Led
void ShuMa(unsigned char ShuMa_Wei, unsigned char ShuMa_Index)
{
P2 = ShuMa_Data[ShuMa_Index];
if( ShuMa_Wei == 0 )
{
ShuMa_Duan_0 = 0;
ShuMa_Duan_1 = 1;
ShuMa_Duan_2 = 1;
ShuMa_Duan_3 = 1;
}
else if( ShuMa_Wei == 1 )
{
ShuMa_Duan_0 = 1;
ShuMa_Duan_1 = 0;
ShuMa_Duan_2 = 1;
ShuMa_Duan_3 = 1;
}
else if( ShuMa_Wei == 2 )
{
ShuMa_Duan_0 = 1;
ShuMa_Duan_1 = 1;
ShuMa_Duan_2 = 0;
ShuMa_Duan_3 = 1;
}
else if( ShuMa_Wei == 3 )
{
ShuMa_Duan_0 = 1;
ShuMa_Duan_1 = 1;
ShuMa_Duan_2 = 1;
ShuMa_Duan_3 = 0;
}
//We must delay 1ms here, or else the Led will not show a correct number
Delay_1ms(1);
}
//Convert the time to a displayable format
void CalcSecond()
{
if( 0 < Hour )
{
Shi_Left = Hour / 10;
Ge_Left = Hour % 10;
Shi_Right = Minute / 10;
Ge_Right = Minute % 10;
}
else
{
Shi_Left = Minute / 10;
Ge_Left = Minute % 10;
Shi_Right = Second / 10;
Ge_Right = Second % 10;
}
}
//Counter Timer
void Interrupt_Timer_0() interrupt 1
{
static int Counter = 0;
TH0 = 0xB8;
TL0 = 0x00;
++Counter;
if( 49 < Counter )
{
//Ths scope will run 1 time per second
Counter = 0;
TIME_DOT = ~TIME_DOT;
Second--;
//Let's see how long time is left
if( Second < 0 )
{
Second = 59;
Minute -= 1;
}
if( Minute < 0 )
{
if( 0 < Hour )
{
Hour--;
Minute = Second = 59;
}
else
{
Hour = Minute = Second = 0;
TR0 = 0; //Disable counter timer
TR1 = 1; //Enable Beep Timer
}
}
CalcSecond();
}
}
//Beep timer
void Interrupt_Timer_1() interrupt 3
{
static int n = 0, Counter = 0;
TH1 = 0xB8;
TL1 = 0x00;
++Counter;
if( Counter < 10 )
{
Beep = 0;
}
else if( Counter < 30 )
{
Beep = 1;
}
else if( Counter > 49 )
{
Counter = 0;
TIME_DOT = ~TIME_DOT;
n++;
if( n >= 5 )
{
Hour = DEFAULT_HOUR;
Minute = DEFAULT_MINUTE;
Second = DEFAULT_SECOND;
n = 0;
//Disable two timers
TR0 = 0;
TR1 = 0;
}
}
}
//Covert time to be recognizable
void formatTime()
{
if( Minute >= 60 )
{
Minute = 0;
Hour = Hour + 1;
}
if( Hour >= 99 )
{
Hour = 0;
Minute = 0;
Second = 0;
}
CalcSecond();
}
void main()
{
//To avoid long press
int Pressed = 0;
//Light Timer Dot
TIME_DOT = 0;
//Turn Off Beep
Beep = 1;
//Make P3 output high-level signal
P3 = 0xFF;
CalcSecond();
//Infinite loop
while(1)
{
//Covert time to be recognizable
formatTime();
//Show time the led screen
ShuMa( 0, Shi_Left );
ShuMa( 1, Ge_Left );
ShuMa( 2, Shi_Right );
ShuMa( 3, Ge_Right );
if( 0 == TR0 && 0 == TR1 ) //If timer is not running
{
if( 0 == Step1m && 0 == Pressed )
{
//If Step1m button is pressed down
Pressed = 1;
Minute = Minute + 1;
}
else if( 0 == Step10m && 0 == Pressed )
{
//If Step10m button is pressed down
Pressed = 1;
Minute = Minute + 10;
}
else if( 0 == Step1h && 0 == Pressed )
{
//If Step1h button is pressed down
Pressed = 1;
Hour = Hour + 1;
}
else if( 0 == StepStart && 0 == Pressed )
{
//If StepStart button is pressed down
Pressed = 1;
if ( 0 != Hour || 0 != Minute || 0 != Second )
{
Init_Timer();
Init_Interrupt();
}
}
else
{
if( 1 == Step1m && 1 == Step10m && 1 == Step1h && 1 == StepStart )
{
//If no button is pressed down
Pressed = 0;
}
}
}
}
}
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