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PIR sensor sensitivity — Parallax Forums

PIR sensor sensitivity

noobmunchernoobmuncher Posts: 124
edited 2008-11-14 19:17 in Robotics
Hey,·

I am try to have my newly revamped robot detect motion to some extent accuratley, problem is it seems to be WAY·too sensitive.· Any suggestions on how to fix this?

Comments

  • BadgerBadger Posts: 184
    edited 2008-11-13 23:04
    noobmuncher

    I am not for sure but you may be able to adjust your programing and set parameters to make your robot to do what you wish based on an high and a low variable


    I hope this is correct and helpful


    Badger
  • iDaveiDave Posts: 252
    edited 2008-11-14 06:44
    I'd be interested in what others might say also. My first thought would be to apply a lower voltage, maybe from a 3.3 voltage regulator. If that don't work how about covering it a bit with some tape. Also, don't forget about the high - low switch on the bottom. That doesn't influence it's sensitivity, but i think it varies how quickly the output pin will go high & low.

    Dave

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  • SRLMSRLM Posts: 5,045
    edited 2008-11-14 08:07
    What sort of sensitivity do you want to decrease? I see two options: distance (only closer objects should register) or movement speed (only really fast objects should register). The distance should be relatively easy: just find a material that is semi opaque in the IR light range. The second would be much more difficult, since it's probably hard coded into the software. You might be able to fool it by having lots of fully opaque dots (like, really small) over the lens.
  • noobmunchernoobmuncher Posts: 124
    edited 2008-11-14 19:17
    Well i am not sure what type SRLM, but all i know is that it basically is constantly saying it is detecting something, even in a dark room with no motion in it at all. And it does switch occasionally just a blip though. It's not my programming, because i have been testing it with the code that Parallax provides. As far as putting some tape over it or trying using a resistor to drop the voltage, it's worth a shot! i have heard that putting a piece of film strip over it can help, but i don't know if i heard that or am just making that up.

    As far as what i plan to do with it is to just, well detect motion and use it as an input into various programs.

    Thanks all, all suggestions and comments are read and appreciated!
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