基于KEIL5编写C++代码，PROTEUS8.15进行仿真，全部资源在页尾，提供安装包。

#include <reg52.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
#include "LCD1602.h"
#include "DS1302.h"//IO设置
//****************************************************
sbit CS   =  P2^3;        //ADC0832引脚定义
sbit CLK  =  P2^4;
sbit DIO  =  P2^5;
sbit key1 =  P1^3;
sbit key2 =  P1^4;
sbit key3 =  P1^5;
sbit key4 =  P1^6;
sbit key5 =  P1^7;
sbit beep =  P2^6;
sbit out1 =  P3^0;
sbit out2 =  P3^1;unsigned char KEY_NUM = 0;
bit Flag\_KEY\_Set = 0;
unsigned char KEY2_Count = 0;
static uchar u,U,YL;
static int numbermax=100,flag=0,time_num,flag1=0,hournum=8,minutenum=0,miaonum=0,flag2 = 0;void ajpd(void);
void twpd(void);
void sjqh(void);
void nzpd(void);
void Delay(unsigned int xms)
{unsigned char i, j;while(xms--){i = 2;j = 239;do{while (--j);} while (--i);}
}uchar get\_AD\_Res()          //ADC0832启动读取函数
{uchar i, data1=0, data2=0;CS=0;CLK=0;DIO=1;\_nop\_();CLK=1;\_nop\_();CLK=0;DIO=1;\_nop\_(); CLK=1;\_nop\_();CLK=0;DIO=0;\_nop\_();CLK=1;\_nop\_();CLK=0;DIO=1;\_nop\_(); for(i=0; i<8; i++){CLK=1;\_nop\_();CLK=0;\_nop\_();data1=(data1<<1)|(uchar)DIO; }for(i=0; i<8; i++){data2=data2|(uchar)DIO<<i;CLK=1;\_nop\_();CLK=0;\_nop\_();}CS=1;return(data1 == data2)?data1:0;
}//显示实时时钟
//****************************************************
void Display_RTCC()
{unsigned char *weeklist\[7\]={"Sun","Mon","Tue","Wed","Thu","Fri","Sat"};LCD1602\_write\_com(0x80);							//指针设置到第一行第1列LCD1602_prints("20");LCD1602_printc(DS1302Buffer.Year/10 + 0x30);	 //显示Year高位LCD1602_printc(DS1302Buffer.Year%10 + 0x30);	 //显示Year低位LCD1602_printc('-');LCD1602_printc(DS1302Buffer.Month/10 + 0x30);	 //显示Month高位LCD1602_printc(DS1302Buffer.Month%10 + 0x30);	 //显示Month低位LCD1602_printc('-');LCD1602_printc(DS1302Buffer.Day/10 + 0x30);		 //显示Day高位LCD1602_printc(DS1302Buffer.Day%10 + 0x30);		 //显示Day低位LCD1602\_write\_com(0x80+13);							 //指针设置到第一行第14列LCD1602_prints(weeklist\[DS1302Buffer.Week -1\]);LCD1602\_write\_com(0xc0);				 //指针设置到第二行第1列LCD1602_printc(DS1302Buffer.Hour/10 + 0x30);	 //显示Hour高位LCD1602_printc(DS1302Buffer.Hour%10 + 0x30);	 //显示Hour低位LCD1602_printc(':');LCD1602_printc(DS1302Buffer.Minute/10 + 0x30);	 //显示Minute高位LCD1602_printc(DS1302Buffer.Minute%10 + 0x30);	 //显示Minute低位LCD1602_printc(':');LCD1602_printc(DS1302Buffer.Second/10 + 0x30);	 //显示Second高位LCD1602_printc(DS1302Buffer.Second%10 + 0x30);	 //显示Second低位	
}void main()
{LCD1602_Init();									//初始化LCD1602LCD1602\_delay\_ms(1);LCD1602\_set\_position(0,0);//指针设置到第一行第1列LCD1602_prints("Hello World!");LCD1602\_set\_position(0,13);//指针设置到第一行第13列LCD1602_prints("STC");LCD1602\_delay\_ms(500);LCD1602\_write\_com(0x01);					//清屏指令DS1302_Init();									//初始化DS1302beep = 0;while(1){if(flag==0){DS1302_GetTime(&DS1302Buffer);							//获取当前RTCC值if(Flag\_Time\_Refresh==1&& Flag\_KEY\_Set == 0)			//数据更新时才刷新LCD{Flag\_Time\_Refresh = 0;Display_RTCC();				//显示实时时钟		}u=get\_AD\_Res();	   //压力传感器U=(250*u)/128;    YL=200*U/250;LCD_ShowNum(2,14,YL,3);LCD_ShowNum(2,10,numbermax,3);}ajpd(); //按键判断twpd();  //投喂判断nzpd(); //闹钟判断sjqh(); // 时间切换time_num++;											    //计时变量+1if(time_num == 5000){time_num = 0;}}
}void nzpd() //闹钟判断
{if(flag==0){if(DS1302Buffer.Hour == hournum && DS1302Buffer.Minute == minutenum && DS1302Buffer.Second > miaonum){flag2 = 1;numbermax = 50;LCD_ShowNum(2,10,numbermax,3);out1 = 1;out2 = 0;beep=1;Delay(300);beep=0;Delay(300);}else{flag2 = 0;}
}
}
void sjqh() //时间切换
{if(flag == 2){if(flag1 == 1){if(time_num % 100 == 0 ){LCD1602\_set\_position(0,0);//指针设置到第一行第1列LCD1602_prints("nao zhong");LCD1602\_set\_position(1,0);//指针设置到第二行第1列LCD1602_printc(hournum/10 + 0x30);	 //显示Hour高位LCD1602_printc(hournum%10 + 0x30);	 //显示Hour低位LCD1602_printc(':');LCD1602_printc(minutenum/10  + 0x30);	 //显示Minute高位LCD1602_printc(minutenum/10  + 0x30);	 //显示Minute低位LCD1602_printc(':');LCD1602_printc(miaonum/10  + 0x30);	 //显示Second高位LCD1602_printc(miaonum/10  + 0x30);	 //显示Second低位	}if(time_num % 200 == 0 ){LCD1602\_set\_position(1,1);LCD1602_printc("      ");}}if(flag1 == 2){if(time_num % 100 == 0 ){LCD1602\_set\_position(0,0);//指针设置到第一行第1列LCD1602_prints("nao zhong");LCD1602\_set\_position(1,0);//指针设置到第二行第1列LCD1602_printc(hournum/10 + 0x30);	 //显示Hour高位LCD1602_printc(hournum%10 + 0x30);	 //显示Hour低位LCD1602_printc(':');LCD1602_printc(minutenum/10  + 0x30);	 //显示Minute高位LCD1602_printc(minutenum%10  + 0x30);	 //显示Minute低位LCD1602_printc(':');LCD1602_printc(miaonum/10  + 0x30);	 //显示Second高位LCD1602_printc(miaonum/10  + 0x30);	 //显示Second低位	}if(time_num % 200 == 0 ){LCD1602\_set\_position(1,4);LCD1602_printc("      ");}}if(flag1 == 3){if(time_num % 100 == 0 ){LCD1602\_set\_position(0,0);//指针设置到第一行第1列LCD1602_prints("nao zhong");LCD1602\_set\_position(1,0);//指针设置到第二行第1列LCD1602_printc(hournum/10 + 0x30);	 //显示Hour高位LCD1602_printc(hournum%10 + 0x30);	 //显示Hour低位LCD1602_printc(':');LCD1602_printc(minutenum/10  + 0x30);	 //显示Minute高位LCD1602_printc(minutenum%10  + 0x30);	 //显示Minute低位LCD1602_printc(':');LCD1602_printc(miaonum/10  + 0x30);	 //显示Second高位LCD1602_printc(miaonum/10  + 0x30);	 //显示Second低位	}if(time_num % 200 == 0 ){LCD1602\_set\_position(1,7);LCD1602_printc("      ");}}}
}void ajpd()  //按键判断
{if(!key4){numbermax++;while(!key4);}if(!key5){numbermax--;while(!key5);}if(!key1) //切换模式{flag++;if(flag>2){flag=0;}if(flag==1){LCD1602\_write\_com(0x01);					//清屏指令LCD1602\_set\_position(0,0);//指针设置到第一行第1列LCD1602_prints("nao zhong");LCD1602\_set\_position(1,0);//指针设置到第二行第1列LCD1602_printc(0 + 0x30);	 //显示Hour高位LCD1602_printc(8 + 0x30);	 //显示Hour低位LCD1602_printc(':');LCD1602_printc(0 + 0x30);	 //显示Minute高位LCD1602_printc(0 + 0x30);	 //显示Minute低位LCD1602_printc(':');LCD1602_printc(0 + 0x30);	 //显示Second高位LCD1602_printc(0 + 0x30);	 //显示Second低位	}while(!key1);}if(!key2) //切换时间{flag1++;if(flag1>3){flag1=1;}while(!key2);}if(!key3){if(flag1==1){hournum++;if(hournum>24){hournum=0;}}if(flag1==2){minutenum++;if(minutenum>60){minutenum=0;}}while(!key3);}
}void twpd() //投喂判断
{if(flag2 == 0){if(YL>numbermax){out1=0;out2=0;beep=0;}else{out1=1;out2=0;beep=1;Delay(300);beep=0;Delay(300);}}}

具体动态效果看B站演示视频：