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Thread: Driving motors through L293D

  1. #21
    Administrator T-1000 rao's Avatar
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    A TSOP 1738 goes low when it detects 38KHz pulse and remains high otherwise

    Rao

  2. #22

    Default range control

    im usin a simple astable multivibrator with an ir load and a tsop 1738 reciever for my robot.what shoul i do to control its range.the reciever ckt is same as the ckt of rockgrid.i want to sense objections from 2cm away[/img]

  3. #23
    Super Moderator T-1000 docel's Avatar
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    Sandeep!
    Break a chopper-wheel Led sourcre/sensor module and use it as a "reflective sensor (you'll find 2 in an old mouse)
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  4. #24

    Default chopper wheel led sensor

    plz explain it ,dosel

  5. #25
    Super Moderator T-1000 docel's Avatar
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    Sorry That was for some other forum...
    1. As I see it, you are making a uC less mouse. This needs a light/ no or less light sensor.Since you have a L298 You can attach a LDR/Preset combo to the I/P.
    2. OR, the TSOP o/p can directly connect to the ip of 293.
    3. OR this Ckt:
    http://groups.yahoo.com/group/bangal...view/8268?i=13

    Shown is SPDT relay. You can change to DPDT.
    2 ckts for 2 motors.
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

  6. #26

    Default

    im makin a maze solvin robot usin l293 driver,astable mv with ir diode as load and tsop as reciver.but the problem is that i want it to sense obstructions only from 2 or 3 cm away.i heard that its havin a range of a few metres.how should i reduce its range

  7. #27
    Administrator T-1000 rao's Avatar
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    then dont use a TSOP!!
    use a normal photodiode or LDR.. just increase the intensity of IR LED by putting higer resistance thats it.. it will even detect black as a surface..

    Rao

  8. #28
    Super Moderator T-1000 docel's Avatar
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    Default TSOP sensitivity

    Hi,
    Absolutely rao.
    TSOP is VERY sensitive. It almost responds omnidirectionally!
    To decrease sensitivity ( ? ) you can enclose the entire module in black paper and put a tube of 3mm to 5mm inner dia and aim it at some convenient distance. This will make it directional and less sensitive ., ie. less distance.
    docel
    ^Anything is possible..
    after YOU prove it!!

    http://bangalorerobotics.tripod.com

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