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  1. Replies
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    Here ! ...and kicking :-P Maybe we must keep...

    Here !
    ...and kicking :-P
    Maybe we must keep writing without expecting.
    I think I will try that, after a long sabbatical.
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    Important points: Thrust or force needed to stick...

    Important points: Thrust or force needed to stick to the wall = weight (G force)+ force to stick.to the wall ( suction force)+ force to move the crawler against these forces.Since the parameters are...
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    Thanks Vikas. These are commercial right now. I...

    Thanks Vikas. These are commercial right now.
    I saw something like this being used at Bhuj during our Earthquake Relief work by a French Relief team. It wasn't as effective as the present systems...
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    The only known method is Sub-surface Radar /...

    The only known method is Sub-surface Radar / Ground penetrating Radar.
    It could be VHF/UHF/ Microwave or Ultrasonic, depending upon practical and financial constraints.
    A lot of DSP techniques are...
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    Poll: Good to know all this - looks like you have done...

    Good to know all this - looks like you have done much more than an most Engg. students. Congrats!

    1. Google is your BEST ever teacher... but be warned, not everything you "see" on the net is easy...
  6. Thread: Motor driver

    by docel
    Replies
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    17,077

    There are 2 ways to simplify PWM control through...

    There are 2 ways to simplify PWM control through a Bridge circuit. One is simple the other is not.
    The simple one -
    1. The PWM simply switches the power supply voltage to the motors on and off....
  7. Thread: Motor driver

    by docel
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    17,077

    Youre a quick and Smart-alec kid alright... but...

    Youre a quick and Smart-alec kid alright... but you have the concept a little bit wrong :-(
    Please hold a bit before trying that till I reach home- will clarify.
    --Sent from my Nokia mobile--
  8. Thread: Motor driver

    by docel
    Replies
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    17,077

    1. :-)) Mohit !! you read it between the lines...

    1. :-)) Mohit !! you read it between the lines alright !!
    Those transees can make coffee. best is to fit a CPU heatsink with its attached fan.
    2. Why do you need more than 2PWM channels ?? 2 PWMs...
  9. Thread: Motor driver

    by docel
    Replies
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    17,077

    Simply speaking, connect same type transistors in...

    Simply speaking, connect same type transistors in parallel to increase the total current.
    There are limits to this though.
    1. You can easily drive by adding another transistor in parallel
    2. The...
  10. Thread: Motor driver

    by docel
    Replies
    24
    Views
    17,077

    Simply speaking, connect same type transistors in...

    Simply speaking, connect same type transistors in parallel to increase the total current.
    There are limits to this though.
    1. You can easily drive by adding another transistor in parallel
    2. The...
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    HAPPY ENGINEERS DAY to all !

    338

    ! Happy Engineers Day !
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    Anything needs some maintenance Vikas. I have...

    Anything needs some maintenance Vikas. I have used the sharp sensor with great results but even that gets fogged and gets spoilt. IF you need any accuracy, you have to clean it almost everyday too....
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    Yes... I have done that too. Used one of my ADC...

    Yes... I have done that too. Used one of my ADC Atmega8 LFR boards as sensor/ processor
    The mirror on top gets fogged too.
    Now I use a Acrylic Rod/tube with the LDR and LED embedded in a drilled...
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    :confused: Vikas.....! You mean you're REALLY...

    :confused: Vikas.....!
    You mean you're REALLY gonna make it ?
    Nice to hear that - was wondering how come no one took the bait for so many months ;)
    Good luck!!
  15. Thread: Line follower

    by docel
    Replies
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    3,457

    Use a Flip-flop and switch the Default turning to...

    Use a Flip-flop and switch the Default turning to the opposite side during ( and triggered by ) the 180deg turn.

    Good Luck !
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    Dont fool around with Li-ion / Li-Poly batteries....

    Dont fool around with Li-ion / Li-Poly batteries.
    They are quite dangerous and explode with authorized hi-tech ( expensive) chargers itself.
    Cheap / self made chargers should not be used at all.
    ...
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    Try a LM338 T or K Take your pick. You cant...

    Try a LM338 T or K Take your pick. You cant eliminate the heatsink though.
    Another trick; use a 7805 to reduce the 12v to 5v , and feed it to a 3.3v LDO like LM1117, LM2950 etc.,
    Cascading 2...
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    :rolleyes: :rolleyes: :rolleyes: :rolleyes:

    :rolleyes:
    :rolleyes:
    :rolleyes:
    :rolleyes:
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    Still coming .....? ...Lattice says " expiring...

    Still coming .....?
    ...Lattice says " expiring October 31st" ....:)
  20. :confused: :rolleyes: :eek: :o

    :confused: :rolleyes: :eek: :o
  21. Thread: Tank Treads

    by docel
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    5,312

    If you used those 'cheap' geared motors available...

    If you used those 'cheap' geared motors available 'everywhere' in India thats what is bound to happen ! You need more Torque - not more RPM. 100RPM is too weak to pull the weight of the hinges.
    ...
  22. Thread: mobile bug

    by docel
    Replies
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    6,563

    Youre right. Make sure the Capacitor is vertical.

    Youre right. Make sure the Capacitor is vertical.
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    A PIR sensor will do - for the Jungle- since the...

    A PIR sensor will do - for the Jungle- since the human will be the ONLY source of heat there...apart from tigers and such. PIR sensors are optimised for human body heat , but they work as movement...
  24. Thread: mobile bug

    by docel
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    6,563

    This guy is trying to MAKE it himself, for a...

    This guy is trying to MAKE it himself, for a change ......
    What good is a Ready-made link ?? It may discourage self learning and enterprise..... a foundation for the likes of Diwaker Vyas ;);)
  25. Thread: mobile bug

    by docel
    Replies
    8
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    6,563

    The .22 disc ceramic capacitor is used as a LC...

    The .22 disc ceramic capacitor is used as a LC tuned circuit; with the leg lengths of 18mm spaced 8mm spacing and stray capacitance , it will act as a high gain tuned circuit at the Mobile phone...
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