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電路原理圖如下：
proutes
四路搶答器電路設(shè)計(jì) 設(shè)計(jì)指標(biāo): 基本功能 可同時(shí)供 4 名選手參賽,其編號(hào)分別是 1 到 4,各用一個(gè)搶答按鈕
單片機(jī)源碼：
- #include<reg51.h>
- #define uchar unsigned char
- #define uint unsigned int
- char s;
- uchar num=0;
- char time=20; //搶答時(shí)間
- char datitime=30; //答題限時(shí)時(shí)間
- uint tt,t1; //T0,T1定時(shí)器定一秒時(shí)
- bit flag,s_flag=1,b_flag,fall_flag; //標(biāo)志位
- bit K_startcountflag,K_timecountflag; //時(shí)間調(diào)整標(biāo)志位
- sbit K0=P3^0;
- sbit beep=P3^7; //蜂鳴器輸出口
- sbit rled=P3^1; //指示燈輸出口
- sbit K1=P1^0;
- sbit K2=P1^1;
- sbit K3=P1^2;
- sbit K4=P1^3;
- sbit K_Time=P3^2; //答題計(jì)時(shí)鍵
- sbit K_startcount=P3^3; //開始搶答時(shí)間調(diào)整鍵
- sbit K_timecount=P3^4; //答題計(jì)時(shí)時(shí)間調(diào)整鍵
- void delay(uchar ms)
- {
- uchar y;
- for(;ms>0;ms--)
- for(y=120;y>0;y--);
- }
- uchar code tabledu[]={0x3f,0x06,0x5b,0x4f,
- 0x66,0x6d,0x7d,0x07,
- 0x7f,0x6f,0x77,0x7c,
- 0x39,0x5e,0x79,0x71
- };
- uchar code tablewe[]={0XFE,0XFD,0XFB,0XF7};
- void T0_Init(void)
- {
- TMOD=0X01;
- TH0=(65536-2000)/256;
- TL0=(65536-2000)%256;
- TH1=(65536-2000)/256;
- TL1=(65536-2000)%256;
- ET0=1;
- ET1=1;
- EA=1;
- P0=0;
- }
- void Key_Scan(void) //開始鍵掃描
- {
- if(K0==0)
- {
- delay(10);
- if(K0==0)
- {
- while(!K0);
- TR0=1;
- s=time;
- tt=0;
- flag=1;
- s_flag=1;
- b_flag=1;
- num=0;
- beep=1;
- rled=1;
- fall_flag=0; //清除違規(guī)標(biāo)志位
- K_startcountflag=0;
- K_timecountflag=0;
- }
- }
- }
- void Scan(void) //四路熱鍵掃描(哪個(gè)鍵先按下,哪個(gè)優(yōu)先級(jí)最高)
- {
- if(K1==0)
- {
- delay(10);
- if(K1==0)
- {
- while(!K1);
- num=1; //數(shù)碼管顯示1號(hào)"1"
- TR0=0; //關(guān)閉定時(shí)器0,時(shí)間停止
- TR1=1; //打開定時(shí)器1,使揚(yáng)聲器響一聲
- s_flag=0; //關(guān)閉開始鍵標(biāo)志位,使再按其他三個(gè)鍵不會(huì)響應(yīng)
- }
- }
- if(K2==0) //下面三個(gè)鍵的處理同上
- {
- delay(10);
- if(K2==0)
- {
- while(!K2);
- num=2;
- TR0=0;
- TR1=1;
- s_flag=0; //重要
- }
- }
- if(K3==0)
- {
- delay(10);
- if(K3==0)
- {
- while(!K3);
- num=3;
- TR0=0;
- TR1=1;
- s_flag=0;
- }
- }
- if(K4==0)
- {
- delay(10);
- if(K4==0)
- {
- while(!K4);
- num=4;
- TR0=0;
- TR1=1;
- s_flag=0;
- }
- }
- }
- void display(void)
- {
- if(flag==1) //開始鍵按下,開始計(jì)時(shí)搶答
- {
- if(num!=0) //如果有人搶答,則顯示相應(yīng)的幾號(hào)
- {
- P0=tabledu[num]; //顯示幾號(hào)搶到了
- P2=tablewe[0];
- delay(2);
- P0=0;
- P2=0XFF;
- }
- else //否則沒人搶答,則前面不顯示幾號(hào)
- {
- P0=0;
- P2=0XFF;
- }
- P0=tabledu[s/10]; //下面為顯示搶答倒計(jì)時(shí)
- P2=tablewe[2];
- delay(2);
- P0=0;
- P2=0XFF;
- P0=tabledu[s%10];
- P2=tablewe[3];
- delay(2);
- P2=0XFF;
- P0=0;
- }
-
- }
- void Time_Scan(void) //調(diào)整時(shí)間鍵掃描
- {
- if(K_startcount==0) //搶答時(shí)間調(diào)整
- {
- delay(10);
- if(K_startcount==0)
- {
- while(!K_startcount);
- time++;
- if(time==50)
- {
- time=20;
- }
- K_startcountflag=1; //將搶答時(shí)間標(biāo)志位置1
- K_timecountflag=0; //同時(shí)關(guān)閉答題時(shí)間標(biāo)志位
- }
- }
- if(K_timecount==0) //答題時(shí)間調(diào)整
- {
- delay(10);
- if(K_timecount==0)
- {
- while(!K_timecount);
- datitime++;
- if(datitime==60)
- {
- datitime=30;
- }
- K_timecountflag=1;
- K_startcountflag=0;
- }
- }
- }
- void main(void)
- {
- T0_Init();
- while(1)
- {
- Key_Scan(); //開始鍵掃描
- if((flag==0)&(s_flag==1)) //當(dāng)開始鍵沒按下及沒有人違規(guī)時(shí)才可進(jìn)行時(shí)間調(diào)整
- {
- Time_Scan();
- }
- if((flag==1)&(s_flag==0))//當(dāng)開始鍵按下及有人搶答才進(jìn)行開始回答計(jì)時(shí)倒計(jì)時(shí)
- {
- if(K_Time==0)
- {
- delay(10);
- if(K_Time==0)
- {
- while(!K_Time);
- s=datitime;
- TR0=1;
- tt=0;
- TR1=1;
- }
- }
- }
- if((flag==0)&(s_flag==1)) //違規(guī)
- {
- Scan();
- if(num!=0) //開始鍵沒有按下時(shí),有人按下了搶答器,則置違規(guī)標(biāo)志位
- {
- fall_flag=1;
- rled=0;
- }
- }
- if((flag==1)&(s_flag==1)) //如果開始鍵按下且搶答鍵沒有人按下,則進(jìn)行八路搶答鍵掃描
- {
- Scan();
- }
- display(); //顯示到數(shù)碼管上
- }
- }
- void timer0(void) interrupt 1
- {
- TH0=(65536-2000)/256; //2ms
- TL0=(65536-2000)%256;
- if(b_flag) //開始(START)鍵按下,嘟一聲(長1秒),表示開始搶答
- {
- beep=~beep;
- }
- else
- beep=1;
- if(s<5) //搶答時(shí)間快到報(bào)警,隔1秒響一聲且紅燈閃爍,響三聲
- {
- if(s%2==0)
- {
- b_flag=1;
- rled=0;
- }
- else
- {
- b_flag=0;
- rled=1;
- }
- }
- tt++;
- if(tt==500) //1秒
- {
- tt=0;
- s--;
- b_flag=0; //關(guān)閉開始鍵按下響一秒的嘟聲
- if(s==-1)
- {
- s=20;
- TR0=0;
- flag=0; //顯示F FF
- s_flag=1;
- num=0;
- rled=1;
- }
- }
- }
- void timer1(void) interrupt 3 //定時(shí)器1處理有人按下?lián)尨鹌鬣揭宦?長1秒)
- {
- TH1=(65536-2000)/256;
- TL1=(65536-2000)%256;
- beep=~beep;
- t1++;
- if(t1==500)
- {
- t1=0;
- TR1=0;
- }
- }
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