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Thread: range finding

  1. #1
    Junior Member Newbie
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    Default range finding

    hai guys,
    i jyst wanted to know is there any readymade stuff for range finding
    ,i checked out some transducers which would cost $35, i want some
    cheaper ones,
    plz let me know if u guys know something of that sort

  2. #2
    Administrator T-1000 vikas's Avatar
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    Default Well

    Sonar sensors are availible in india also well last one i hear comone was offering them from about Rs 700 thats good enough if you dont want to build your own

  3. #3
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    Default IR Range finding

    Hey ,
    U can use IR for range finding.
    Sharp's GP series IR range sensors give output directly in digital format.
    and regrding U-Sonic you can make a simple PIC 16f84 based range calculator which can give u range measurements from 3 cm to 100 cm with 1 cm acuracy.

    Thanx and regards
    -
    Pulkit

  4. #4
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    Default

    hiii pulkit

    do u think those GP2DI2 distance measuring sensors are available here in india??if so do let us know ..where and how to get those!!

  5. #5
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    Default ir distance

    HEllo

    well the Sharp's GP series IR range sensors are good but there is availibility is not that easy . And thats why i did not recommend them . IT your know of a place where you can buy them ( and the cost ) let us know .

  6. #6
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    Default

    Sharps IR sensor range is limited to 12 cm,that was what i read last time
    But they are rugged enough.and pretty accrate.

    Sonars rather ultrasonics are good for long ranges.I have done one,but just gave a ping and received a ping back.I still have to load the math on the F84a.
    here's a link:
    http://www.leang.com/robotics/info/a...n/minison.html

    Sonar transducers come for Rs 350 a pair in Bombay.Remeber u have to have access to tuning equipment[an oscilloscope/sig generator] if u plan to make ur own sonar set.]

    If u have any old polaroid sensors lying around,u can rip of the sonar range module right off. Google for "polaroid sonar"

    happy_99 ahd got the gp12 sensors from acroname.Maybe he can help u with the prices.

    ice
    //gerry

  7. #7
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    Default HI its pulkit !!

    Well Ice ,
    The schematic given on this site is technically incorrect and it is just an idea , because if u notice the gain at the first stage has a value of 10000 which is impractical to realise in a high impedance ckt. with out appropriate pre-amplifier , author must have used a concatenated series ampl. here to achieve this gain , so in practical system this ckt. will fail or will give absurd signals.

    thanks and regards
    -
    Pulkit

  8. #8
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    Default

    vikas can u be plz more specific about who is 0ffering as i need it urgently within 2 to 3 days

  9. #9
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    Default i dun know

    Well i am not offering an sensors i was just quoting a price which i heard from one of my friends who was using it .

  10. #10
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    Default

    Pulkit,
    Thanks for the info.The circuit used to give spurious outputs,but rarely.

    The range was limited.but good enough for obstacle avoidance,but difficult for ranging.I'll try it out again,this time i'll load the math in the F84.
    It'll be good if u can suggest us a few circuits.
    Thanks again.
    gerry

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