งานที่ 4 MQ-2 gas sensor interfacing with pic microcontroller

                                       MQ-2 gas sensor interfacing with pic microcontroller

code

// LCD module connections

sbit LCD_RS at RD2_bit;

sbit LCD_EN at RD3_bit;

sbit LCD_D4 at RD4_bit;

sbit LCD_D5 at RD5_bit;

sbit LCD_D6 at RD6_bit;

sbit LCD_D7 at RD7_bit;

sbit LCD_RS_Direction at TRISD2_bit;

sbit LCD_EN_Direction at TRISD3_bit;

sbit LCD_D4_Direction at TRISD4_bit;

sbit LCD_D5_Direction at TRISD5_bit;

sbit LCD_D6_Direction at TRISD6_bit;

sbit LCD_D7_Direction at TRISD7_bit;

////// MQ-2 gas sensor interfacing with pic microcontroller ///////

int gas_value;

char text[10];

void main(void)

{

ADC_Init(); // it will initialize the adc module of pic16f877a microcontroller

Lcd_Init(); // Initialize LCD

Lcd_Cmd(_LCD_CLEAR); // Clear display

Lcd_Cmd(_LCD_CURSOR_OFF); // Cursor off

Lcd_Out(1,1,"MQ-2 sensor" ); // Write text in first

delay_ms(2000);

Lcd_Cmd(_LCD_CLEAR); // Clear display

while(1)

{ // Endless loop

gas_value = ADC_Read(0); // It will read the gas value of sensor

if( gas_value > 400 )

Lcd_Out(1,1, "Gas detected" );

else

Lcd_Out(1,4, "No Gas " );

intToStr(gas_value, Ltrim(text));

Lcd_Out(2,1, text );

delay_ms(1000);

}

}

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