Have you tried adjusting any settings on the PIR itself? Most (not all) sensors have some kind of adjustment that can be done by turning a knob or using a screwdriver (potentiometer).

Do you have a link for "TotalRobots", I could not find them from a google search.

Not all PIR have the adjustment potentiometers like SteveG pictured. The kind he pictured is probably the standard type now, but there are older ones still being sold that don't have the pots and in documentation suggest having a pull up or pull down resister. I'd really like to see the exact PIR you purchased @R1D1. If you can't find a site link to the product can you post a pic of your PIR if SteveG's advice does not work?

@RichardR, I'm surprised the Parallax PIR's run on 3.3 volts. That's handy to know!

@R1D1 Try it on an analog port (since it is an old PIR version).... see if the voltage changes with motion.... Also I was referring to the ezb's signal pin being only 3.3v... that may have something to do with why it won't work ....

@JustinRatliff

@RichardR, that makes sense, you have the revB that works in the lower voltage range.

Here is a picture of the sensor. There is no place to make any adjustments. I was however able to dig up some old notes that came with it saying that if it always indicates that the sensor is activated, then to connect a 10k resistor between the signal wire and ground. So now I've got to see if I've got one laying around, as Radio Shack is no longer!

Hmmm, so it needs a pull down resistor then....

Unfortunately, too much secular work right now. I will try to wire up the resistor this weekend and post as to whether or not this was successful.

Thanks for all of the input so far.

@R1D1, if you can't find a 10K resister let me know and I'll mail you a few for free. My email address is in my profile.