AO: analog signal output
NOTE:
After the sensor is powered, need to warm about 20S, measured data becomes stable, heat sensor is normal
Size:
Test program:
Function: This version of the test program supporting
Use 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!
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/ ************************************************* *******************
Note: 1, when the measured concentration is greater than the set density, single-chip IO port output low
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# Include // library files
#define uchar unsigned char // macro definition unsigned char
#define uint unsigned int // macro definition unsigned int
/ ************************************************* *******************
I / O definitions
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sbit LED = P1 ^ 0; // define microcontroller P1 port of the first one (ie P1.0) to indicate the end
sbit DOUT = P2 ^ 0; // define the microcontroller P2 port first one (ie P2.0) as an input sensor
/ ************************************************* *******************
Delay function
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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
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void main ()
{
while (1) // infinite loop
{
LED = 1; // off P1.0 port 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 the concentration higher than the set value, the implementation of the Con
{
LED = 0; // P1.0 port lights lit
}
}
}
}
/ ************************************************* *******************
End
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