PIR sensor pIC16f877 explanation pLEASE!!

[delifadzli]

PIR sensor pIC16f877

hi everyone , i want to ask on how to deal with PIR sensor...PIR sensor is basically a motion detector that detect motion...so in this case, i would like use that sensor to act as as input to my ceiling fan controller( using LM35 sensor)...

the problem is, this sensor only operate as the motion goes through. while in my project i would like to use it to detect the human that pass through the door which automatically turn on the entire ceiling fan controller....i wonder, as the human pass through the door like 5 meter away from the door...isn't the overall system will turn off? how to make it still operating??? i just want to turn it off (overall system) if the human leave the door/room....

easy to say, if someone entering the room overall system still on...if the someone leave the room the system will be off...

can anyone help me?

 

[delifadzli]

PIR sensor pIC16f877

transmitter link :


Receiver link :
[/url

here is schematic that i found regarding automatic light controller based on human detection...

so here i wanna ask...isn't ok to use this diagram...by replacing AT89s52 with PIC16f877A and the InfraRed sensor being replaced with PIR sensor

the schematic i found consist of transmitter and receiver part...i would like to eliminate the transmitter circuit and just using the receiver part ( Infrared sensor replaced with PIR sensor)

still no one to help me...please...i quite blur...

Added after 1 minutes:

link for receiver part
[url]https://2.bp.blogspot.com/_3gu68B4AUcs/SyDtPpgx06I/AAAAAAAAAAc/dxzUCRw_zbk/s1600-h/room.gif


still waiting for ur respond

 

[marius810327]

No, it will not work. for a PIR sensor to function correctly you need signal condisioning and amplification, thus I suggest you search for PIR circuit in google.

Then to detect a human, it depend how you want to go about doing that. You can make use of a comparator circuit or write a software alorithm for a microcontroller.

 

[lockman_akim]

u use PIR from cytron??

i think if you want to let your system remain ON, it depend on your programing..

 

[delifadzli]

yup i bought it from cytron

i had done the programing....in C

can u check it for conformation..

#include <16F877A.H>
#device ADC=10
#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 20000000)


#include "C:\Users\deli\Documents\Google Talk Received Files\teng\brum\Flexlcd2.c"

//==========================

#define      LED1     PIN_D7
#define      LED2     PIN_D6
#define      LED3     PIN_D5
#define      LED4     PIN_D4

void main(void)
{
       int16 temp_adc,counter1;
       int temp, inout_counter=0,PIR1,PIR2,in,out;


        setup_adc(ADC_CLOCK_DIV_8);
        setup_adc_ports(PIN_A1);
        set_adc_channel(1); //read analog input from channel 1


        lcd_init();

         lcd_putc("\fTemperature:\n");

          while(1)


          {
	        PIR1=0;
          PIR2=0;
          in=0;
          out=0;
            temp_adc = read_adc();
            temp = 5.00*temp_adc*100.00/1023.00;
            lcd_gotoxy(1,2);
            printf(lcd_putc,"%d",temp);

          {//?


          PIR1 = input(PIN_B6);
          PIR2 = input(PIN_B7);

	  if(PIR1==1)
          {
            for(counter1=2000;counter1>0;counter1--)
            {
               PIR2 = input(PIN_B7);
               delay_ms(1);
               if(PIR2==1)
               in=1;
            }
            if(in==1)
            inout_counter++;
          }

          else if(PIR2==1)
          {
            for(counter1=2000;counter1>0;counter1--)
            {
               PIR1 = input(PIN_B6);
               delay_ms(1);
               if(PIR1==1)
               out=1;
            }
            if(out==1)
            inout_counter--;
          }

          if(inout_counter>0)
          {
            if((temp<20))
            {
            //delay_ms (500);
            output_high(LED1);
            }
            else
            {
            output_low(LED1);
            }

            if ((temp>= 20) && (temp_adc <30))
            {
            output_high(LED2);

            }
            else
            {
            output_low(LED2);
            }

            if ((temp_adc >= 30))
            {
            output_high(LED3);

            }
            else
            {

            output_low(LED3);
            }
         }
         else

         output_high(PIN_D4);
        }
        }

}

i will be using 2 PIR sensor...to check out for human detection

 

[lockman_akim]

hak3..sory bro..

i hate c..im BASIC user. it is more easier to use..

 

[marius810327]

Hi,

I would add a 30 second to 1min start up delay for the detector to stabilize. Then average samples can be used to create a profile of detection. Remember that depending from which side you approach the detector the signal will differ. Make sure you have added sufficient gain on the front end, because a proper profile cannot be created with a signal in the mV range. You can also add a pulse counter to avoid false triggering.

Hope this could make things easier.

MN