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PIR Motion Sensor #555-28027 — Parallax Forums

PIR Motion Sensor #555-28027

bstewart63bstewart63 Posts: 3
edited 2010-10-16 17:35 in Accessories
PIR Motion Sensor #555-28027


Has anyone measured the current draw on this module?

I bought 2 from Digi-Key and they are pulling 10mA each @5v not 100uA like the spec sheet says..

They both seem to work fine but I am using them on a battery power supply and 10mA is a lot more than 100uA.

I see that it has an onboard voltage regulator but I couldn’t find any data on it. I think maybe the passive current draw on that might be causing the problem.

Thanks

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2010-10-16 12:16
    The documentation on Parallax's website says "> 3mA, may vary". 10mA is indeed greater than 3mA. An on-board regulator's idle draw could account for some of that. I can't see any mention of 100uA.

    If you're using this with a Stamp or other 5V microcontroller, you could power it intermittently from an I/O pin to reduce average power ... depending on what you intend to use it for.

    The X-Band motion detector draws about the same (8mA)
  • bstewart63bstewart63 Posts: 3
    edited 2010-10-16 17:35
    Hi Mike,
    Thanks for the reply and information.
    Your link to the data sheet is different than the one I found. I must have found an old sheet because it shows <100uA current draw.
    Here is the PDF I was looking at.
    http://www.parallax.com/dl/docs/prod/audiovis/pirsensor-v1.2.pdf
    3mA is a lot closer to 10 than 100uA.

    Thanks again.

    Brian
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