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Thread: A question about micromouse comp. at techfest

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  1. #1
    Guest
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    Default A question about micromouse comp. at techfest

    Hi guys,
    Few days back one of my friend who had visited techfest stated the the first prize winner at micromouse solved the maze in only 15secs. I would like to know whether he had used steppers or dc motors and if he had used stepppers how is it possible to obtain the required speed for completion of maze this fast.He told me that the person had made motors to run at 600 rpm. I would be very thankful if anyone could tell me more about this.
    -Thanking in advance.

  2. #2
    Senior Member T-1000
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    If its at 600RPM,its got to be a DC motor.

    It doesnt matter what kind of motors u use once
    you got sensor feedback.
    I

  3. #3
    Senior Member Cyborg
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    He used stepper motors.
    and He worked almost full year to prepare for this contest coz last time his machine had developed some problem.
    Vivek
    --
    " To get working ideas effectively, I try to fail as fast as I can. "
    Richard Feynman
    --
    http://www.youtube.com/watch?v=JqlawTD_9B0

  4. #4
    Guest
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    Vivek but i dont understand how can one run stepper motor so fast, if nybody knows plz to give info about it.
    -thanks guys

  5. #5
    Senior Member T-1000
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    Vivek,
    But can a stepper achive that high a speed?

  6. #6

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    slightly deviating from the topic at hand where is the micromouse competition held(other than iit) and neplace i can get more info about it?cant he have used stepper motors geared for rpm?i mean they are generally high torque arent they?

  7. #7
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    Hi,

    I almost missed these questions, as i only see the forum on a weekend and that too not regular.

    there are steppers which run at 1000rpm too.
    but I doubt this guys steppers were running at 600rpm.

    but i am sure they were steppers.

    the steppers in floppy drives can take upto 300rpm approx but with a robots mechanical load that goes down drastically.

    i doubt he used floppy steppers too.

    I wonder how the number of 600rpm went into circulation.
    i hope i get time to find out the details.

    for example the exact completion time was 18sec not 15sec.
    i hope numbers have not been amplified in communication.

    using a gearbox is an option but increase in speed would result in torque reduction. hence the robot has to be lighter.
    so for now we can assume he found good quality steppers which have torque high enough to be reduced and yet be useful.

    cheers!

  8. #8
    Gopal Patel
    Guest

    Default Yes its the stepper motor

    yes its stepper motor, bipolar 10 ohm stepper motor,using chopper driver
    { allegro 3952 } and Atmega16 uC . its completed in 15 second and top speed may sometime cross the 2m/second speed... he use PID control for stepper motor ----- yes its the Open Loop PID control ,the whole timing is preloaded in the uC........It took only one month to complete that uC. and Last time He also win the Micromouse -- Second Prize,but first indian to complete the micromouse. last time he use top-down looking sensor and this time side looking ir sensor.............

  9. #9
    Gopal Patel
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    for example the exact completion time was 18sec not 15sec.
    i hope numbers have not been amplified in communication.

    no number is not amplified but at the competition it took 18 second but after that just to show again he place it second time then it took 15 second,600 rpm can be calculated as 2m/sec and wheel diameter is 4.5cm......rest you can do....

  10. #10
    Senior Member Cyborg
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    Great!!

    this is the first time I have seen anyone use a PID control in a hobby robot in India, esp. yantriki.
    (i have not seen past 2 yantrikis).

    thats really good work ...coz some people are just good at writing algorithms and software and some are good at making hardware.
    but he did both and did it well.

    cheers!
    Vivek
    --
    " To get working ideas effectively, I try to fail as fast as I can. "
    Richard Feynman
    --
    http://www.youtube.com/watch?v=JqlawTD_9B0

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