Testing procedures]

1,  when the measured concentration is greater than the set concentration, single-chip IO port output low

/ ************************************************* *******************

Function: This version supporting test procedures

Using a Chip: AT89S52

Crystal: 11.0592MHZ

Baud Rate: 9600

Compiler Environment: Keil

[Statement] This procedure is used only for study and reference, please indicate the copyright and author information!     

************************************************** ******************* /

/ ************************************************* *******************

Note: 1, when the measured concentration is greater than the set concentration, single-chip IO port output low

************************************************** ******************* /

#include          // library

#define uchar unsigned char // unsigned char macro definition

#define uint unsigned int // macros unsigned integer

/ ************************************************* *******************

                            I / O definitions

************************************************** ******************* /

sbit LED = P1 ^ 0;  // definition of the microcontroller P1 port of the first one (ie P1.0) to indicate the end

sbit DOUT = P2 ^ 0;  // definition of the microcontroller P2 port first one (ie P2.0) as an input sensor

/ ************************************************* *******************

                            Delay function

************************************************** ******************* /

void delay () // delay procedure

{

uchar m, n, s;

for (m = 20; m> 0; m--)

for (n = 20; n> 0; n--)

for (s = 248; s> 0; s--);

}

/ ************************************************* *******************

                            The main function

************************************************** ******************* /

void main ()

{

while (1) // infinite loop

{

 LED = 1;    // Off P1.0 mouth lights

 if (DOUT == 0) // When the concentration is higher than the set value, the implementation of the Con

 {

    delay (); // delay interference

When if (DOUT == 0) // determine concentrations higher than the set value, the implementation of the Con

    {

 LED = 0;    // P1.0 port lights lit

}

 }

}

}

/ ************************************************* *******************

                              End