DrawBot – The Hacks

Sandy Noble's modifications to Adafruit's Motor Shield

Sandy Noble's modifications to Adafruit's Motor Shield

Chatting with Sandy Noble over at the Polargraph website has been extremely helpful1  It looks like he’s added three changes to the Adafruit Motor Shield:

  • Heatsink added23
  • Breakout boards to connect the terminals to the clips for the motor leads.  However, it looks like there’s a small little component of a circular purple variety also on that board.
  • Extra pins for hooking up a cooling fan.  Sandy says he doesn’t use them any more, but it really wouldn’t be a bad idea given that it would take hours for even a simple print.

  1. The photo is from Sandy Noble’s photo stream.  It says All Rights Reserved and I will happily take it down if he asks and says this is not a fair use.  Given that all of his stuff has been very open source, I’m guessing this was just a default setting. []
  2. To the H-Bridges? []
  3. Also…  Where does one get a heatsink?  How do you attach it? []

7 Responses to “DrawBot – The Hacks”

  1. kongorilla says:

    I live near Jameco, so you’ll find 2 of these on my motor shield:

    http://www.jameco.com/webapp/wcs/stores/servlet/Product_10001_10001_2077335_-1

    You’re supposed to use heat sink adhesive (google it) to attach them. I believe I used super glue, though. I assume the thermal dissipation isn’t as good, but I’ve been fine (so far).

    I should mention that since I’m using low voltage motors that suck up current like crazy, I also piggybacked L293Ds, so my shield has four of them (2 pairs, that is, one heat-sink per pair). “Piggybacking” is described on this page:

    http://www.ladyada.net/make/mshield/use.html

  2. cyrozap says:

    Look for “ram chip heat sinks” like this (http://www.amazon.com/Xbox-Heatsinks-HANA-Southbridge-Chips/dp/B003WGLSNW) that have the sticky thermal pad attached.

  3. MakerBlock says:

    @Cyrozap: Awesome! Thank you for the link!

  4. MakerBlock says:

    @kongorilla: Sooo… you seriously just drop another H-bridge on top of another H-bridge and solder them together?? Could you post a picture of what yours looks like?

  5. Cameron says:

    I’m pretty sure the “small little component of a circular purple variety” is just a jumper wire, since the screw terminals don’t have the same spacing as the header pins.

  6. MakerBlock says:

    @Cameron: Ha! I think you’re right!

  7. […] Optional:  Hack the Adafruit Motor Shield […]

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