Hi,
I'm trying to use a PIR sensor following the below blog
http://bildr.org/2011/06/pir_arduino/
The problem is that is detecting always a movement. I have tried to attach a multimeter between the ground and the Output (which is the one that is wired to the Arduino input pin for reading) but the voltage goes up and down (1.15 - 4.29) all the time.
Is something wrong with this sensor?
What is the best (not too expensive) PIR sensor for Arduino ?
Are you moving, when you did this test ?
Is there anything in your vicinity which is moving, or which is generating a variable amount of heat or IR ?
It is probably working, and the place where you are doing this, is not quiet enough.
This seems to be a useless device. I suggest you go and read the 69 comments about it at that other forum post you linked to.
Hi, I have this problem too. But this happen only with http POST request. Maybe this is hardware problem.
Try test with this:
http://www.elecfreaks.com/wiki/images/1/1e/Pirtestbb.gif
I think arduino don't need resistor for PIR.
Also try to change jumpers (H or L) or sensors setting (sensitivity & time).