PIC BASIC with PIR sensor

ANT1

Below is my code, I am using a PIC16F84A with PIC BASIC, and am trying to get my PIR to light an LED 2 times, on and off, when it detects an object, any assistance would be much appreciated.

---

input 5
symbol· PIR············ =5··············· 'Passive infrared sensor, to RB 5

high 1
pause 500
low 1
Main:
IF PIR = 1 THEN PIRdetect

· PAUSE 500
goto main
end


PIRdetect:


·high 1·· 'high RB 1
· pause 500
· LOW 1
·
· pause 500
·
· high 1
· pause 500
· low 1
·
· pause 500
···
goto main

---

Thank you.


·

Mike Green

"IF PIR = 1" probably doesn't do what you want (test the PIR I/O pin). Reread the manual about testing I/O pins. We can't really help you here on programming problems with a PIC or a PIC compiler since this is a Parallax product support forum and this problem isn't really about the PIR sensor.

ANT1

Maybe I am hooking it up wrong, do I need a pull down resistor on the output pin of the PIR?



Any advice for connection would help me to narrow down the problem.

Mike Green

You need neither a pullup or pulldown resistor. You operate the PIR sensor off the same power supply as the Stamp or PIC or whatever (3.3V to 5V). The output pin is either a logic low or logic high as described in the PIR sensor datasheet.

I really don't think the problem is in the connection. I think it's a programming problem.