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#include  "reg51.h"

#include  "intrins.h"

#define  u8 unsigned char 

#define  u16 unsigned int 

sbit  Pump          =  P1^1;

sbit  Up_aerate     =  P1^2;

sbit  Up_staleness  =  P1^3;

sbit  Down_Aerate   =  P1^4;

P1M1 = 0x00;

P1M0 = 0xFF;

void delay_us (u16 t)

{

int i;

while(t--)

{

_nop_();

  _nop_();

  i=1;

  while(--i);

}

}

void delay_ms (u16 ms)

{

while(ms--)

{

delay_us(1000);

}

}

void main()

{

  while(1)

{

Pump = 1;

delay_ms(6000);

Pump = 0;

delay_ms(6000);

  Pump = 1;

Up_aerate = 1;

delay_ms(6000);

Up_aerate = 0;

delay_ms(6000);

  Up_aerate = 1;

Up_staleness = 1;

delay_ms(6000);

Up_staleness = 0;

        delay_ms(6000);

        Up_staleness = 1;  

}

}