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Can anyone check a schematic? — Parallax Forums

Can anyone check a schematic?

WhelzornWhelzorn Posts: 256
edited 2006-03-01 05:03 in General Discussion
I am very new at designing circuits, and I usually mess up a few times when breadboarding, so can anyone check this over? I don't have values for any of the passive components, but that's not what I'm worried about. I just want to make sure I wired it right so I can feel confident when I make a PCB for this. The datasheet for the L298 can be found here.

heres the schematic:
MotorController.bmp

Thanks a lot,
Justin W.

Comments

  • Harrison.Harrison. Posts: 484
    edited 2006-02-28 03:05
    First problem, you are missing a 10k pullup resistor on pin 4 (MCLR).· I believe that he 16f84 has no facilities to disable this pin's mclr function, so you must have a pullup on the line or else you can run into erratic behaivor.

    Second problem, your motor controller's pins are labeled wrong.· The L298's pin 9 is supposed to be labeled VCC not VSS.· This could lead to confusion for you later.

    Harrison

    Post Edited (hpham) : 2/28/2006 3:09:25 AM GMT
  • WhelzornWhelzorn Posts: 256
    edited 2006-03-01 03:15
    Ok, thanks, I added a 1k pullup resistor to the MCLR pin. Intrestingly enough, pin 9 is labelled Vss on the datasheet, though Vcc would make more sense.
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2006-03-01 05:03
    Hello,

    ·· Since this forum is devoted to Parallax Microcontrollers we really need to curb the posts regarding other microcontrollers.· Thanks.· As it is off-topic to the content of this forum this thread is being locked.


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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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