pir sensor with microcontroller

//all these # below set up the PIC
//#include <16F877A.h>
//#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Highspeed Osc > 4mhz
#FUSES PUT //Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection

These are configuration setup for MCU

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#use delay(clock=20000000) // Sets crystal oscillator at 20 megahertz
#use rs232(baud=9600, xmit=PIN_C6, invert) //Sets up serial port output pin & baud rate

Here you are defining the Clock for the delay, speed or baud rate for uart and other peripherals setups

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#define PIR_SENSOR PIN_A0
#define RED_LED PIN_B7
#define sw PIN_A1

Here you are assigning GPIO pins for sensor , led and switch
like,
PORT A pin 0->> sensor input(input).
PORT B pin 7 ->> led indication(output).
PORT A pin 1->>switch(input) .

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void main()
{
set_tris_a(0xff); //TRIS function for GPIO settings, if its zero means gpio assigned for output.1-> input.here portA pins are assigning as a input
set_tris_b(0x00); //TRIS function for GPIO settings, if its zero means gpio assigned for output.1-> input.here portB pins are assigning as a output


setup_adc_ports(AN0);// selecting ADC channel channel0 
setup_adc(ADC_CLOCK_INTERNAL);// selecting adc using internal clock 
setup_psp(PSP_DISABLED); // alternte function on same pins is disabling
setup_spi(FALSE);//spi disabled
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);// Timer0 clock setup and timer 0 enabled
setup_timer_1(T1_DISABLED);//timer 1 disabled
setup_timer_2(T2_DISABLED,0,1);//timer2 diabled
setup_comparator(NC_NC_NC_NC);// comparator module disabled
setup_vref(FALSE);// setting internal Vref for ADC

while(true)// infinte loop
{ 
set_adc_channel(0);// scanning adc channel0 or reading adc channel 0
delay_us(20);// delay routine


if(PIR_SENSOR==0 && sw==0)// checking switch is off and sensor data is null
{
output_high(PIN_B7);// led on or High
}
else
{     //else any data from sensor or switch is on
output_low(PIN_B7); // led is off or low
}//end main

aadebola5 said:

please can anyone assist me by going through this code, the LED is to come on when the switch is on and the pir sensor detects motion.. this is the code


//all these # below set up the PIC
//#include <16F877A.h>
//#device adc=8
#FUSES NOWDT //No Watch Dog Timer
#FUSES HS //Highspeed Osc > 4mhz
#FUSES PUT //Power Up Timer
#FUSES NOPROTECT //Code not protected from reading
#FUSES NODEBUG //No Debug mode for ICD
#FUSES NOBROWNOUT //No brownout reset
#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOCPD //No EE protection
#use delay(clock=20000000) // Sets crystal oscillator at 20 megahertz
#use rs232(baud=9600, xmit=PIN_C6, invert) //Sets up serial port output pin & baud rate
#define PIR_SENSOR PIN_A0
#define RED_LED PIN_B7
#define sw PIN_A1



void main()
{
set_tris_a(0xff);
set_tris_b(0x00);


setup_adc_ports(AN0);
setup_adc(ADC_CLOCK_INTERNAL);
setup_psp(PSP_DISABLED);
setup_spi(FALSE);
setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

while(true)
{ set_adc_channel(0);
delay_us(20);


if(PIR_SENSOR==0 && sw==0){
output_high(PIN_B7);
}
else{
output_low(PIN_B7);
}


}
}

Click to expand...

wanted to be sure if it is ok, before i start the hardware implementation..

Click to expand...

the problem now after trying this is that the LED came on when the switch(sw) was switched on when motion was detected and that ws all, it wont detect again..please can anyone help me mdify then code .to make the LED come on when motion is detected and off when motion is not detected.. thanks

Click to expand...

if(PIR_SENSOR==0 && sw==0){
output_high(PIN_B7);
}
else{
output_low(PIN_B7);
}