distance sensor - 2 meters

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

  1. bug13

    Thread Starter Senior Member

    Feb 13, 2012
    1,493
    53
    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

    Moderator

    Jun 19, 2012
    1,932
    591
    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
    1,493
    53
    • 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
    4,718
    5,048
  5. bug13

    Thread Starter Senior Member

    Feb 13, 2012
    1,493
    53
  6. Sensacell

    Moderator

    Jun 19, 2012
    1,932
    591
    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
    1,493
    53
    I find that they draw too much power (for my application)
     
  8. nsaspook

    AAC Fanatic!

    Aug 27, 2009
    4,718
    5,048
    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

    Late Member

    May 4, 2013
    2,274
    889
  10. atferrari

    AAC Fanatic!

    Jan 6, 2004
    3,014
    1,118
  11. bug13

    Thread Starter Senior Member

    Feb 13, 2012
    1,493
    53
    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...