一.仿真proteus图，可直接运行：

二. 51单片机源代码，keil开发环境：

#include

#define uchar unsigned char

#define uint unsigned int

sbit IN1 = P2^0;

sbit IN2 = P2^1;

sbit PWM = P2^2;

sbit Key1 = P1^7;

sbit Key2 = P1^6;

sbit Key3 = P1^5;

sbit Key4 = P1^4;

sbit Key5 = P1^3;

uint t = 46082;

void delay_ms(uchar t)

{

uchar x,y;

for(x = t;x > 0;x--)

for(y = 110;y > 0;y--);

}

void Timer0_Init()

{

TMOD = 0X01;

TH0 = (65536 - 46082)/256;

TL0 = (65536 - 46082)%6;

EA = 1 ;

ET0 = 1;

TR0 = 1;

}

void Positive_Rotation()

{

IN1 = 0;

IN2 = 1;

}

void Reverse_Rotation()

{

IN1 = 1;

IN2 = 0;

}

void Stop_Rotation()

{

IN1 = 1;

IN2 = 1;

}

void Key_Scan()

{

if(Key1 == 0)

{

delay_ms(20);

if(Key1 == 0)

{

Positive_Rotation();

}

}

else if(Key2 == 0)

{

delay_ms(20);

if(Key2 == 0)

{

Reverse_Rotation();

}

}

else if(Key3 == 0)

{

delay_ms(20);

if(Key3 == 0)

{

Stop_Rotation();

}

}

else if(Key4 == 0)

{

delay_ms(20);

if(Key4 == 0)

{

t = t + 100;

if(t > 65000)

t = 65000;

}

}

else if(Key5 == 0)

{

delay_ms(20);

if(Key5 == 0)

{

t = t - 100;

if(t < 500)

t = 500;

}

}

}

void main()

{

Timer0_Init();

while(1)

{

Key_Scan();

}

}

void timer0() interrupt 1

{

TH0 = t/256;

TL0 = t%6;

PWM = ~PWM;

}