Noobie Question

[mel4853]

I'm using a 12f675 to control a camera to take pictures of wildlife.I have a motion sensor hooked to gp3 which is a input only, but can't figure out why it never reads this. I need to hold that input low until the motion sensor sees motion which will bring this input high. Here's the code.********************************************* *******************
'* Name : hpcam.BAS *
'* Author : [select VIEW...EDITOR OPTIONS] *
'* Notice : Copyright (c) 2006 [select VIEW...EDITOR OPTIONS] *
'* : All Rights Reserved *
'* Date : 6/22/2006 *
'* Version : 1.0 *
'* Notes : *
'* : *
'************************************************* ***************
symbol cambut=4
symbol pir=pin3
symbol on=2
symbol lite=1
symbol led=0
symbol counter=5
symbol CMCON=$19
symbol ANSEL=$9f

main:
poke ANSEL,$00
poke CMCON,$07
high on
pause 250

loop:
if pir=1 then takepic
high led
pause 250
low led
pause 250
b1=b1+1
if b1>230 then camoff
goto loop

camoff:
low on
pause 2000
high on
pause 8000
b1=0
goto loop

takepic:
high lite
pause 250
high cambut
pause 1000
low lite
low cambut
pulsout 5,2
pause 250
for b0=1 to 4
pause 60000
high led
pause 250
low led
next b0
goto camoff

[mister_e]

as i'm not familiar with the PBC lines i can just ask if you correctly set the configuration fuse when you program your device?

Be sure you set MCLR to i/o, internal or INTRC depending of the syntax of your device programmer software.

If your PIR signal is comming from a relay (wich i suspect) be sure you're using pull down/up resistor... uneless this pin is floating and it may work sometimes, sometime not.

EDIT: by reading your post again... i suspect you miss the pull-down resistor

I need to hold that input low until the motion sensor sees motion which will bring this input high.

[mel4853]

I have a 10k pulldown resistor on board, the motion sensor gives a +5 volts when triggered, which should pull this input high. I have one of these working using a PICAXE chip, but switched chips to gain the extra I/O. I just need to know how to configure the GP3 pin. Sorry for not making this clear on first post. Thanks for any help.

[mister_e]

O.K.
whe you program your PIC, your device programmer software MUST allow you to set the configuration fuse somewhere. Find it first..

Got it?

Now it must have at least 1 place to configure the MCLR pin and one other for the Oscillator

YES... set it to I/O, INTRC, or something else than MCLR or RESET.

This is a ScreenShot of PICSTART (MPLAB)
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=942&stc=1&d=1151464220 ">

This is a screenshot of BK precision 844a
<img src="http://www.picbasic.co.uk/forum/attachment.php?attachmentid=941&stc=1&d=1151464220 ">


About now?

[paul borgmeier]

In addition to Steve's comments ...

Does your LED blink while waiting for PIR to go high? (i.e., Is your PIC alive - are you sure the PIC is working.)

What happens if you hardwire GP3 high – does your IF THEN catch it and turn on your camera?

Have you measured GP3 with a meter to make sure it really goes high when the PIR is triggered?

Is there a chance you could be missing the PIR high signal? Your loop only looks for high signal once (for a singe uS) every ½ second.

You have not initialized b1 to zero at the beginning of your code. It gets set later but you should set it early as well.

Is this the same program you used with your axe?

I just need to know how to configure the GP3 pin

you have no choice it is auto configured as an input, which is what you want.

Out of interest, what are you going to film? A guy a few weeks ago set one of these up to video hedgehogs.

Paul Borgmeier
Salt Lake City, Utah
USA

[dhouston]

you have no choice it is auto configured as an input, which is what you want.

Only if you set the config fuse to disable MCLR and make GPIO.3 an input.

[mel4853]

Thanks for all the help, the program is working like a champion. My resistor on GP3 pulling to ground was not pushed into proto board all the way.
Also for Paul, I'm using this to run a digital camera to photograph deer.THANKS again for everybody's help. I'm sure you'll be hearing from me again, as I'm building a solar charger for this camera setup, just not sure what I want it to do yet.