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BabelProp: Prop in an Atmega328 format — Parallax Forums

BabelProp: Prop in an Atmega328 format

TubularTubular Posts: 4,717
edited 2010-09-19 16:37 in Propeller 1
I have to admit, designing pcbs in animal shapes sure beats rectangles

attachment.php?attachmentid=73310&stc=1&d=1284848387
BabelProp3.png
831 x 427 - 29K

Comments

  • wjsteelewjsteele Posts: 697
    edited 2010-09-18 16:38
    I love it!!! But, the name seems familar to me... Hmmm (http://forums.parallax.com/showpost.php?p=876923&postcount=11)

    :-)

    Fantastic job!!!

    Bill
  • HarleyHarley Posts: 997
    edited 2010-09-18 16:53
    I've laid out a number of pcbs, and don't understand why the 28-pin through hole IC shorts out the 44-lead SMD Prop at the 4 corners.

    I suppose cost is no object. I'd guess this non-rectangular shape will cost extra to route.

    There should also be a bypass cap on each set of Power pins on the Prop. Only appears to be one.

    A number of traces appear to be at other than multiples of 45°. Does the plot process allow this? Sometimes this can be a problem.

    Nice shape. Is the shape serve a purpose? Just curious.
  • TubularTubular Posts: 4,717
    edited 2010-09-18 18:13
    @Bill, hey I read that thread a while ago and had forgotten. Guess it was stuck in my subconscience as a good name. There are lots of good names in that list by McTrivia. Fortunately there are plenty of fish names to choose from, I'll see what I can come up with instead. GuppyProp? Sounds a bit much like PuppyProp

    @Harley, the shape is just for fun, but it does make it look a lot smaller than the equivalent bounding rectangle. Most pcb fabs won't charge for external shape routing (since they route out of a larger panel anyway), just for internal routing.
    As for why the pins short - not sure what you mean, they just do. I will be cutting off 4 pins of the prop.

    tubular

    edit: Regarding bypassing, its a good idea (especially for overclocking), but not essential. Note Spin Stamp by Parallax only has a single bulk cap
  • HarleyHarley Posts: 997
    edited 2010-09-18 19:06
    From 'here', pins 5, 10, 19, 24 of 28-pin DIP appear shorted to two leads each of the Prop.

    I suppose the leads you'll be cutting off are those corner ones?
  • TubularTubular Posts: 4,717
    edited 2010-09-18 20:30
    @Harley, you're correct, if nothing else works I'll be cutting off the four prop corner pins before soldering the QFP down.

    I haven't completely given up hope on squeezing a resistor between those pins and the header contact, just have to see whats possible once the proto boards come back.

    Btw for the protos I'm using DorkbotPdx.Org, in your neck of the woods. The board cost works out to a little under $2 each in sets of 3, and they don't charge for external routing. It seems like an awesome service.

    cheers
    tubular
  • Beau SchwabeBeau Schwabe Posts: 6,568
    edited 2010-09-18 21:29
    Tubular,

    That's really cool, except now I have a challenge for you so you can optimize the amount of board real-estate...

    TWO different circuit designs... One a FISH, and the other a BIRD. (See attached image) :smilewinkgrin:
    birdfish.jpg
    468 x 460 - 88K
  • Cluso99Cluso99 Posts: 18,069
    edited 2010-09-19 02:22
    The Prop ProtoBoard has 2 x 1uF monos for bypassing. The traditional 80MHz should be fine but I am not sure anyone has fully loaded a pcb with only a singly bypass cap.

    Maybe a Flounder - it has quite a large shape. So does Bream and Snapper. My fish book is on my boat and of course I am not.
  • wjsteelewjsteele Posts: 697
    edited 2010-09-19 09:51
    Tubular wrote: »
    Fortunately there are plenty of fish names to choose from, I'll see what I can come up with instead.

    Heck no... you use that name... it's perfect!

    Bill
  • Heater.Heater. Posts: 21,230
    edited 2010-09-19 11:15
    Douglas Adams would be proud of you. Is that actually going to fit in your ear?
  • TubularTubular Posts: 4,717
    edited 2010-09-19 14:31
    Heater. wrote: »
    Douglas Adams would be proud of you. Is that actually going to fit in your ear?

    There is precisely *one* way to find out!

    Actually Heater now you have me worried - perhaps I should have included a warning message about it being "not suitable for auricular interfacing"

    tubular
  • TubularTubular Posts: 4,717
    edited 2010-09-19 14:35
    wjsteele wrote: »
    Heck no... you use that name... it's perfect!

    Bill

    Thanks Bill... I did try to change the name of the thread to "babel328" but without success... must look into how that is done for future reference

    cheers
    tubular
  • TubularTubular Posts: 4,717
    edited 2010-09-19 14:39
    Beau Schwabe (Parallax) wrote: »
    Tubular,

    That's really cool, except now I have a challenge for you so you can optimize the amount of board real-estate...

    TWO different circuit designs... One a FISH, and the other a BIRD. (See attached image) :smilewinkgrin:

    Beau, now there's a fun challenge! Hmmm what would a bird shaped Prop board be good for...

    I really like the work of M C Escher... thanks for that

    tubular
  • SapiehaSapieha Posts: 2,964
    edited 2010-09-19 14:43
    Hi Tubular.

    It is possible to change Thread name ---> BUT only from first post. --->
    EDIT - Advanced

    Tubular wrote: »
    Beau, now there's a fun challenge! Hmmm what would a bird shaped Prop board be good for...

    I really like the work of M C Escher... thanks for that

    tubular
  • TubularTubular Posts: 4,717
    edited 2010-09-19 16:37
    Sapieha wrote: »
    Hi Tubular.

    It is possible to change Thread name ---> BUT only from first post. --->
    EDIT - Advanced

    Thanks, but I tried that. It changes the title on my first message to Babel328 instead of BabelProp, but all others replys have BabelProp in their message, as does the forum index.

    There must be something I'm missing...
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