Simulation of four way responder based on 51 single chip microcomputer

When the host presses the start button , Start countdown 60 second , The contestants began to rush to answer , When a contestant vies for answers, other contestants' vies for answers are invalid .

And the countdown stops after the contestants rush to answer .

Because I didn't set a new round of buttons , If you need to use a new round of answering, you can add a button to start a new round of answering

Timer configuration code

#include <REGX52.H>

void Timer0_Init(void)
{
	TMOD &= 0xF0;		// Configure timer mode 
	TMOD |= 0x01;		// Set the timer 0 Pattern 
	TL0 = 0x3c;		// Set initial value of timing 50ms Create an interrupt 
	TH0 = 0xb0;		// Set initial value of timing 
	TF0 = 0;		// eliminate TF0 sign 
	TR0 = 1;		// Timer 0 Start timing 
	ET0=1;
	EA=1;
	PT0=0;
}

The digital tube displays the contestant number code

#include <REGX52.H>
#include "Delay.h"	// contain Delay The header file 

sbit we1=P2^0;

// Digital tube segment code table 
unsigned char Table[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};

// Nixie tube display sub function 
void Nixie(unsigned int Speed)
{

	we1=0;
	P0=Table[Speed];	// Segment code output 
	Delay(1);				// Show for a period of time 
	we1=1;
	P0=0x00;				// Segment code clear 0, Shadow elimination 
	
}

The main function 、 Interrupt service function 、 Nixie tube display countdown

#include <REGX52.H>
#include "Delay.h"
#include "Timer0.h"
#include "Nixie.h"

unsigned char NixieTable[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};// Common cathode digital tube segment code 

sbit we3=P2^2;
sbit we4=P2^3;

unsigned int flag=0,ms=60;//ms Set the initial value of countdown 
unsigned int Number=0;
unsigned int x,z,y=0,f=0;

void main()
{	
	Timer0_Init();
	while(1)
	{
		if(P1_4==0)
		{
			Delay(20);while(P1_4==0);Delay(20);
	
			y=1;// Countdown start flag bit ,1 Start countdown 
			flag=1;// Answer the flag bit ,1 Key valid ,0 Invalid key 
		}
		
			x=ms/10;
			z=ms-x*10;// Count down each bit of data into the digital tube display 
		
			we3=0;
			P0=NixieTable[x];	// Segment code output 
			Delay(1);				// Show for a period of time 
			we3=1;
			P0=0x00;				// Segment code clear 0, Shadow elimination 
			
			we4=0;
			P0=NixieTable[z];	// Segment code output 
			Delay(1);				// Show for a period of time 
			we4=1;
			P0=0x00;				// Segment code clear 0, Shadow elimination 
	
	if(flag==1)
		{
			if(P1_0==0)
			{
				Delay(20);while(P1_0==0);Delay(20);
				flag=0;// Make other players unable to answer 
				Number=1;// Get the contestant number and send it to the nixie tube display 
				f=1;// The countdown stops 
			}
			if(P1_1==0)
			{
				Delay(20);while(P1_1==0);Delay(20);
				flag=0;
				Number=2;
				f=1;
			}	
			if(P1_2==0)
			{
				Delay(20);while(P1_2==0);Delay(20);
				flag=0;
				Number=3;
				f=1;
			}
			if(P1_3==0)
			{
				Delay(20);while(P1_3==0);Delay(20);
				flag=0;
				Number=4;
				f=1;
			}
		}
		Nixie(Number);// Nixie tube display function 
	}

}

void Timer0_Routine() interrupt 1
{
	unsigned int T0Count;
	TL0 = 0x3c;		// Set the initial value of timing to 50ms
	TH0 = 0xb0;		// Set initial value of timing 
	T0Count++;
	if(T0Count>=20)
	{
		T0Count=0;
	if(f==0)
	{
		if(y==1)
		{
			ms--;//1s Subtract one time 
			if(ms==0)
			{
				ms=60;
			}
		}
	}
	else
	{
		ms=ms;// The countdown stops after the contestants rush to answer 
	}
		
	}

}

Simulation graphics

  The answering machine made this time is relatively simple , If necessary, you can add code to make the function more comprehensive . If there is enough time in the follow-up, it can be further improved .

Just thought about it, I added a new round of answering buttons

		if(P1_5==0)
			{
				Delay(20);while(P1_5==0);Delay(20);
				break;// Jump out when the key is pressed while Main circulation 
			}

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