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1  Using Arduino / Project Guidance / Mega ADK USB host. Can't find documentation anywhere. on: November 20, 2012, 08:38:43 pm
I just received a brand new mega adk r3 today. I've been ripping my hair out scouring google for the past hour. There are 100 USB host libraries out there for the max3421e, none of them documented and all of them vague to the point of uslessness.  When their example code does compile (half of the examples I've tried call 'powerOn()' which doesnt even exist in the library), it doesnt work.

Can anyone point me to a working library for this thing that actually has documentation on the functions. This seems to be missing from every library I've come across and I would think it's important information.
2  Using Arduino / Project Guidance / Re: Arduino Cd rom plotter on: June 28, 2012, 11:19:24 pm
@kf2qd: unipolar (5 or 6 wire) steppers are essentially just centertapped bipolar motors and can be driven as such by simply ignoring the extra ground wire(s). So a dual h-bridge will do the job regardless of type.

@OP: I've ripped apart many dead drives and if the motors you are referring to are the ones I'm thinking of then they're the center spindle motors, they are 3 phase brushless, not steppers, and are a lot more complex to drive without a purpose-built controller. If they are the laser carriage motors with the lead-screw shaft, the slider frame usually doubles as the front bearing and the motors won't work mechanically if removed
3  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: Arduino Mega suggestion on: October 12, 2010, 12:38:32 pm
Though i cant say i like the "bend the pins" idea as repeated jiggery will totally wreck the headers after 2 or 3 sessions (not to mention how horribly the shields will sit with an 1/8th inch of pin bent over and binding up) and do i want to be able to easily put it on my Duemilanove again at some point, i do like the ICSP header idea though, it's tidy and works.

Unfortunately my uSD shield doesn't have the ICSP header. I suppose i can always try Bit-Banging SPI out of 11-13 on the mega until someone convinces sparkfun to put an ICSP on their uSD shield and pull the SPI from there instead.
4  Forum 2005-2010 (read only) / Bugs & Suggestions / Re: Arduino Mega suggestion on: October 12, 2010, 06:03:42 am
It wouldn't be hard to implement either, merely a matter of physically swapping 4 pins and changing the pin aliases in the IDE/Compiler.  On top of that there are practically no shields specificly for the mega (Protoshields from sparkfun and the like are about the only ones), this change would have little to no impact on existing mega users and would add some much needed functionality for those wanting to use the Mega with existing Duemilanove shields.

I say that being able to plug a shield onto the Mega, load your Duemilanove code and have it just work would be a major improvement.
5  Forum 2005-2010 (read only) / Bugs & Suggestions / Arduino Mega suggestion on: October 12, 2010, 03:48:29 am
I would really like to get my hands on one of the new Mega2560 boards, but i have one hangup:

Would it be at all possible to rearrange the pins, both physicaly and in software, to be truly pin compatible with Duemilanove shields? I have a couple of shields that rely on the SPI pins being on D11-13. I cant even rig the shield to use different pins because the SPI is way over in the big header on the far end of the board.

6  Forum 2005-2010 (read only) / Bugs & Suggestions / Duemilanove USB connector (suggestion) on: April 11, 2010, 09:40:16 pm
Seems every shield in existence is designed with one PTH part or another directly above the USB connector, making for shorts left and right. I don't know about anyone else but to me 'Tape on the shroud' seems like a hokey workaround to a (in my opinion) major design flaw.

Has anyone considered using a mini-b connector instead of the full one? I for one would love to see a Mini-b board.
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