o Assignment: A door sensor is connected to the RB1 pin, and a buzzer is connect

Question

o Assignment: A door sensor is connected to the RB1 pin, and a buzzer is connected to RC7. Write a C language program to monitor the door sensor, and when it opens, sound the buzzer. You can sound the buzzer by sending a square wave of a few hundred Hz frequency to it. The buzzer remains active as long as the door remains open Hints: Planning on how to write the program and make use of tlow chart Use two functions to: implement a function called "delay" to be used in generating the square wave. A function that generates a square wave called " buz"

Explanation / Answer

#include <P18F458.h >

void Delay (unsigned int) ; //function prototype

#define Dsensor PORTBbits.RB1

#define buzzer PORTCbits . RC7

void main (void)

{

    TRISBbits.TRISB1 = 1; //PORTB.1 as an input

   TRISCbits .TRISC7 = 0; //make PORTC . 7 an output

    while (Dsensor ==1)

    {

        buzzer = 0; //here to make square wave for buzzer output with 200ms interval

        Delay (5) ;

        buzzer = 1;

        Delay (5) ;

    }

    while (1) ; //stay here forever

}

//Delay function to generate the square wave.

void Delay(unsigned int itime)

{

    unsigned int i;

    unsigned char j;

    for(i=O;i <itime;i++ )

    for (j=0;j<165;j++);  

}

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