distance sensor - 2 meters

Discussion in 'General Electronics Chat' started by bug13, Sep 29, 2016.

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    Hi guys

    I am looking for a low power distance/proximity sensor, it need to be about 2m in range, anyone come cross anything like this?

    Thanks guys
     
  2. Sensacell

    Well-Known Member

    Jun 19, 2012
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    Can you provide more information about the sensing task?

    Your question is too general for a meaningful answer.
     
  3. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    • It's for detecting people
    • It need to be able to detect if a a person is in the view, no need to know the distance from a person (but could be good to know if available)
    • 2 meters is good, no more than 3 meters, don't want to detect any person more than 3 meters away.
    • 1Hz detection is good enough, no need to be fast. (or see below)
    • Low power, it needs to be under 1mA on average (or can be wake up very fast, do a detection, then go back to sleep quickly)

    Make senses?
     
  4. nsaspook

    AAC Fanatic!

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  5. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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  6. Sensacell

    Well-Known Member

    Jun 19, 2012
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    The "max 2 meters range" is your problem with PIR.

    Ultrasonic ranging sensors- at least you can discriminate objects too far away.
     
  7. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    I find that they draw too much power (for my application)
     
  8. nsaspook

    AAC Fanatic!

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    I sometimes just use black tape over parts of the sensor to decrease sensitivity and to narrow detection direction/range along with proper placement. With good sensors normal room temperature variations should be a non issue.
     
    atferrari and dl324 like this.
  9. RichardO

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    May 4, 2013
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  10. atferrari

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  11. bug13

    Thread Starter Senior Member

    Feb 13, 2012
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    I have tested this on two Panasonic PIR, I can't get constant result. In a cold day, both sensor have smaller range. But bigger range in warmer days. Also it seems the hotter the object (person), the longer the range. Anything I am missing?
     
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