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Breadboard L298hn? — Parallax Forums

Breadboard L298hn?

lardomlardom Posts: 1,659
edited 2013-01-07 16:09 in General Discussion
I bought two L298hn ic's in January of last year and stuck them in a drawer. Today I discovered I couldn't plug them in to my breadboard. I'm wondering if I have to use a breakout board with this chip. Any tips?

Comments

  • LoopyBytelooseLoopyByteloose Posts: 12,537
    edited 2013-01-07 07:43
    It may be much easier to buy a complete kit with a board than to make these work from scratch.
  • ercoerco Posts: 20,259
    edited 2013-01-07 08:30
    Loopy Byteloose wrote: »
    It may be much easier to buy a complete kit with a board than to make these work from scratch.

    And cheaper too! I'm sure you saw this thread... http://forums.parallax.com/showthread.php/144881-3.40-Motor-Driver-Board-(Must-Try-to-not-Buy...)
  • lardomlardom Posts: 1,659
    edited 2013-01-07 08:35
    @Loopy Byteloose, A 'complete' kit makes 'complete' sense. The whole idea is to simplify circuit construction. I had blown another transistor which annoyed me after applying 12V to a circuit that worked fine @ 9V. For the time being I'll stay at 9V.
  • lardomlardom Posts: 1,659
    edited 2013-01-07 08:40
    erco to the rescue. Thanks for the link.
  • ercoerco Posts: 20,259
    edited 2013-01-07 08:45
    I regret not buying a dozen of them at $3.40. Very handy units.

    Unless you blow them up, or they blow up your processor. Read that whole thread, especially the parts about "magic smoke".
  • ercoerco Posts: 20,259
    edited 2013-01-07 08:50
    Although there's nothing wrong with a bare 298. I have several, and I'll build them into a PCB very soon. You can build a 298 unto a much smaller footprint on a complete PCB with processor and sensors, etc than that board. The flyback diodes are the only other critical parts.

    But most people prefer slapping premade modules together to scratch-building perfboard circuits, so I'm in the minority.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2013-01-07 09:11
    lardom wrote: »
    Today I discovered I couldn't plug them in to my breadboard. . . . Any tips?

    Be more persuasive. Let the chip know who's boss.

    attachment.php?attachmentid=90113&d=1330445543

    More pictures here.

    You chips wont be nice and pretty once they've been water boarded breadboarded. Just to be clear, breadboarding these chips is not torture.

    As erco points out in his other thread, I think you're better off sending the PWM signal to the enable pin rather than on of the "in" pins to you're not breifly applying the breaks between the high pulses. I'm recently changed the way my Mecanum robot is wired to use the eable pin this way.
  • ercoerco Posts: 20,259
    edited 2013-01-07 09:33
    OMG, Duane. That's quite a rat's nest you have there. :) Congrats if it works, but what a nightmare if & when a single wire gets disconnected.

    Personally, I would use that photo as a great example of when & why one would prefer to hand-wire and solder a perfboard PCB!

    Again, I know I'm in the minority for even suggesting it. For some reason, people accept breadboards and dozens of wires sticking out in all directions. Maybe people think it looks cool/complicated/high tech. I see many such wire piles on LMR and people's blogs for mobile robots. But seriously, as robots move around, they bump into things and go under things and those wires get knocked around, pulled out, or shorted together, and then it's a big puzzle just to figure out what went wrong.

    I use breadboarding for a quick benchtop test of small circuits almost exclusively.

    BTW, Tommy, this does NOT apply to you! I highly encourage your robot for Expo's LFO to use lots of long wires, dragging on the ground and wrapping around axles. It's "good luck" for someone.

    Duane, you coming to Expo this year?
  • lardomlardom Posts: 1,659
    edited 2013-01-07 09:57
    @Duane Degn, That, my friend, is scary. I'm interested to know of your progress with machine vision. It looks like a fabulous robot.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2013-01-07 13:07
    erco wrote: »
    OMG, Duane. . . . Personally, I would use that photo as a great example of when & why one would prefer to hand-wire and solder a perfboard PCB!

    It was enough to convince me of the same thing. I at least put heat shrink on the resistor leads so they wouldn't short. The above circuit no longer exists on a breadboad.
  • ercoerco Posts: 20,259
    edited 2013-01-07 13:17
    Duane Degn wrote: »
    The above circuit no longer exists on a breadboad.

    Dat's my dawg! http://www.youtube.com/watch?feature=player_detailpage&v=dtYNlNFM2ys#t=6969s great movie but foul language

    So how about Expo, Boss? You and I have some serious chatting to do over a brewski or four!
  • Duane DegnDuane Degn Posts: 10,588
    edited 2013-01-07 16:09
    lardom wrote: »
    . . . I'm interested to know of your progress with machine vision. It looks like a fabulous robot.

    Thanks Larry, I haven't worked on it lately. I've been thinking about it a lot especially since someone recently used Hanno's method to made a line follower. I need to do at least that much.

    erco wrote: »
    So how about Expo, Boss? You and I have some serious chatting to do over a brewski or four!

    Too soon to know. I'd really really like to but I just hate travelling. My desire to attend my win out over my dread of travelling.
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