DC motor speed regulation system based on 51 single chip microcomputer (use of L298)

The design requirements

A key control start / stop it

One key controls the forward and reverse rotation

Two keys control the end of deceleration

The first digit of the four digit nixie tube shows positive and negative 、1 Indicates forward rotation 、0 Indicates inversion , The last three digits show the speed value

use AT89C51 Single chip microcomputer , And DC motor driver L298

L298 Of IN1、IN2 control OUT1、OUT2 Output high and low level

IN3、IN4 control OUT3、OUT4 Output high and low level

Make the two ends of the motor have a voltage difference

Two DC motors can be connected externally .

ENA、ENB Enable the high level of two motor control ports to be effective .

The module used has digital tube display 、 Press to get 、 Timer 0.

Nixie tube display part

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

sbit we2=P2^1;
sbit we3=P2^2;
sbit we4=P2^3;

void Nixie(Number)
{
	switch(Number)		// Bit code output 
	{
		case 0:
		we2=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we2=1;

		we3=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we3=1;
		
		we4=0;
		P0=0x3f;Delay(1);we4=1;	break;	// Segment code output 	
		
		case 1:
		we2=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we2=1;

		we3=0;
		P0=0x5b;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we3=1;

		we4=0;
		P0=0x6d;Delay(1);we4=1;
		break;
			
		case 2:
		we2=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we2=1;

		we3=0;
		P0=0x6d;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we3=1;

		we4=0;
		P0=0x3f;Delay(1);we4=1;break;	// Segment code output 	

		case 3:
		we2=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we2=1;

		we3=0;
		P0=0x07;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we3=1;

		we4=0;
		P0=0x6d;Delay(1);we4=1;break;	// Segment code output 
		
		case 4:
		we2=0;
		P0=0x06;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we2=1;

		we3=0;
		P0=0x3f;	// Segment code output 
		Delay(1);				// Show for a period of time 
		we3=1;

		we4=0;
		P0=0x3f;Delay(1);we4=1;break;	// Segment code output 		
	}
}

Press the key to get the part

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

unsigned char Key()// Key shake elimination and release detection 
{
	unsigned char KeyNumber=0;
	
	if(P1_0==0){Delay(20);while(P1_0==0);Delay(20);KeyNumber=1;}// Get key value 
	if(P1_2==0){Delay(20);while(P1_2==0);Delay(20);KeyNumber=3;}
	if(P1_3==0){Delay(20);while(P1_3==0);Delay(20);KeyNumber=4;}
	
	return KeyNumber;
}

Timer configuration section

#include <REGX52.H>

void Timer0_Init(void)
{
	TMOD &= 0xF0;		// Configure timer mode 
	TMOD |= 0x01;		// Set the timer 0 Pattern 
	TL0 = 0x06;		// Set initial value of timing 250us Create an interrupt 
	TH0 = 0xFF;		// Set initial value of timing 
	TF0 = 0;		// eliminate TF0 sign 
	TR0 = 1;		// Timer 0 Start timing 
	ET0=1;
	EA=1;
	PT0=0;
}

Main function and interrupt service function

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

sbit IN1=P2^4;
sbit IN2=P2^5;
sbit EN=P3^7;
sbit we1=P2^0;

unsigned char Counter,Compare=0;
unsigned char KeyNum;
unsigned int x=0,Speed=0;

void main()
{
	
	Timer0_Init();
	while(1)
	{	
		if(P1_1==0){Delay(20);while(P1_1==0);Delay(20);x++;if(x==2){x=0;}}
		KeyNum=Key();
		
		if(KeyNum==3)
		{	
			Speed++;
			if(Speed==1){Compare=25;}	// Set the comparison value , change PWM Duty cycle 
			if(Speed==2){Compare=50;}
			if(Speed==3){Compare=75;}
			if(Speed==4){Compare=100;}
		}
		if(KeyNum==4)
		{	
			Speed--;
			if(Speed==3){Compare=75;}// Set the comparison value , change PWM Duty cycle 
			if(Speed==2){Compare=50;}
			if(Speed==1){Compare=25;}
			if(Speed==0){Compare=0;}
		}
		we1=0;// Turn on the tab 
		if(x==1)
		{
			P0=0x3f;	// Segment code output 
			Delay(1);	// Show for a period of time 
			we1=1;
		}
		else
		{
			P0=0x06;	// Segment code output 
			Delay(1);	// Show for a period of time 
			we1=1;
		}
	Nixie(Speed);		
	}
}

void Timer0_Routine() interrupt 1
{
	TL0 = 0x06;		// Reload value setting 250us
	TH0 = 0xFF;		
	Counter++;
	if(Counter==100);	// The variation range of the count value is limited to 0~99
	{
		Counter=0;
	}
	if(Counter<Compare)	// The count value is less than the comparison value 
	{
		if(KeyNum==1)
		{
			EN=~EN;	
		}
		if(x==1)
		{
			IN1=0;	
			IN2=1;
		}
		else
		{
			IN1=1;	
			IN2=0;
		}
	}
	else// Set when the count value is greater than the comparison value 
	{
		IN1=1;	
		IN2=1;
//		IN1=0;	
//		IN2=0;
	}
}

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