distance sensor - 2 meters

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

  1. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    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
    1,124
    266
    Can you provide more information about the sensing task?

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

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    • 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!

    Aug 27, 2009
    2,903
    2,155
  5. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
  6. Sensacell

    Well-Known Member

    Jun 19, 2012
    1,124
    266
    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 Well-Known Member

    Feb 13, 2012
    1,208
    38
    I find that they draw too much power (for my application)
     
  8. nsaspook

    AAC Fanatic!

    Aug 27, 2009
    2,903
    2,155
    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

    Well-Known Member

    May 4, 2013
    1,228
    382
  10. atferrari

    AAC Fanatic!

    Jan 6, 2004
    2,644
    759
  11. bug13

    Thread Starter Well-Known Member

    Feb 13, 2012
    1,208
    38
    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?
     
Loading...