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    Re: Micro Crawler

    As it happens, you can only print one color at a time, but the Mojo is capable of printing in a number of different colors now:

    http://www.stratasys.com/3d-printers/idea-series/mojo
    ...
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    Re: Micro Crawler

    Sure they are. The rest of the robot is 3D printed, even though the pieces are help together with stainless steel machine screws.
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    Re: Micro Crawler

    Well, you would want to change the design slightly, so it used actual steel pins instead of plastic snaps, but with that change, I don't see why any halfway decent 3D printer couldn't print them....
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    Re: Micro Crawler

    These treads are actually hard plastic pieces that are snapped together. So you could just use a normal ABS printer to print them.

    - Jon
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    Re: Micro Crawler

    https://www.youtube.com/watch?v=Gln-jAQxop4
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    Re: PhantomX using a Teensy 3.1

    Not bad. I just got my SeeedStudio order on Friday - ordered Feb 24, so almost 4 weeks for me.

    My first rev. 2 MicroPython/uCee board is in the reflow oven as I type this - I should be able to...
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    Re: Micro Crawler

    So I ended up making a few changes to the board design, and ordered a new one with the changes. I decided to try SeeedStudio, and so far I'm impressed. The boards took 4 weeks to get here, and they...
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    Re: PhantomX using a Teensy 3.1

    It really depends on what rules you have defined in DipTrace. Seeedstudio specifies a 6 mil clearance between pads and traces...
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    Re: PhantomX using a Teensy 3.1

    I wouldn't hold your breath waiting for the boards from OSH Park. They are apparently really good for people living in the US. I live in Canada, and it took 5 weeks to get the boards I ordered from...
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    Re: PhantomX using a Teensy 3.1

    That's what I did with my MicroPython board, but its a lot of work.

    http://blog.huv.com/2014/01/custom-micropython-board.html for the board design.
    ...
  11. Re: 18 Dynamixel Ax-12A with ArbotiX/Arduino - How to connect the dynamixel?

    So are you planning on interleaving your servo requests? How you're going to take advantage of parallel serial ports?
  12. Re: 18 Dynamixel Ax-12A with ArbotiX/Arduino - How to connect the dynamixel?

    The part is WM18887-ND at digikey

    - Jon
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    Re: PhantomX using a Teensy 3.1

    Kurt,

    Even though the Analog pins are not 5 volt tolerant, you can still sometimes plug in 5 volt analog sensors. For instance, on uCee I use Sharp analog IR sensors, and they never return more...
  14. Re: 18 Dynamixel Ax-12A with ArbotiX/Arduino - How to connect the dynamixel?

    What's wrong with driving all 18 servos from a single Tx/Rx? Realistically, you're going to want to use some IK engine like NUKE, and it generates SYNC_WRITE commands, which means all 18 servos are...
  15. Re: Hacking a LED voltimeter + thermometer to test battery with alarm

    Your Arduino has analog pins. Create a resistor divider to get the voltage down to the level within spec of the A/D port, and check it periodically. Temperature sensors are cheap and easy to...
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    Re: PhantomX using a Teensy 3.1

    I'll throw in my two cents - I've started using KiCad, and although it has some strangeness in the GUI department, it is quite powerful, and does end-to-end with no limitations, and also does 3D...
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    Re: Micro Crawler

    So, here's my MicroPython board, sitting next to my Teensy 3.1 carrier:

    5353

    It works nicely, and of course the board layout is much better optimized for uCee. I had an issue with the 8 MHz...
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    Re: Alternate cheap/easy embedded platforms

    So my 8 MHz crystal doesn't work for some reason, but I was able to jury rig an 8 MHz ceramic resonator I had in my parts bag (I made a lot of Bioloid boards back in the day, and I still have tons of...
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    Re: Alternate cheap/easy embedded platforms

    Yeah, I have component designators available in my source file - why clutter up the board with them?
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    Re: Alternate cheap/easy embedded platforms

    My board showed up today, as did all the parts for it and the stencil...

    5340

    I'll hopefully be building it tonight or tomorrow.

    - Jon
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    Re: Alternate cheap/easy embedded platforms

    My STM32F405 board above (and the MicroPython board it is based on) both have a uSD card, so I can have lots of flash space. When you connect the board to a PC, it shows up as both a USB serial...
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    Re: Alternate cheap/easy embedded platforms

    Fergs,

    So I've been designing my own STM32F405 board, and will be sending it in for manufacturing later this week. It is set up to become the mainboard for uCee, and will run MicroPython. I'll be...
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    Re: Micro Crawler

    So, next up is a couple things. I need to build 3 ProxDot sensors, and mount them. I need to fix the idler wheels so they stay parallel to the axle line, which will involve printing some internal...
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    Discussion Re: ROS for hobby use

    Having bought hundreds of them, I can tell you: http://www.digikey.com/product-detail/en/0022035035/WM18887-ND/403302

    or http://www.digikey.com/product-detail/en/22-05-7035/WM18901-ND/403342 for...
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    Re: Micro Crawler

    Here's a nice picture, and a better video...

    5322


    https://www.youtube.com/watch?v=Gln-jAQxop4
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    Discussion Re: ROS for hobby use

    Well, you know at least one hobbyist who does...

    I have a cheap pair, bought them from Digikey for under $40, and they work great for Molex style crimping.

    - Jon
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    Re: Micro Crawler

    And here's uCee, rolling around on its own:


    https://www.youtube.com/watch?v=d2gnegs3OcA
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    Re: Micro Crawler

    New blog update showing the latest stuff - I got my Teensy Carrier, so uCee is a lot closer to working.

    5319

    - Jon
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    Re: PhantomX using a Teensy 3.1

    I haven't seen the Recom - it looks interesting, especially for the price.

    I have one of the 10 amp Naos Raptors in Roz (you can sort of see it here). I'm pulling no more than a couple amps from...
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    Re: PhantomX using a Teensy 3.1

    I have a few of the OKI 78SR, and they are nice (although only a tiny bit cheaper than the Pololu version - $4.30 versus $4.95). However, on uCee I couldn't use the OKI's - they are too thick, and...
  31. Re: Magnetic field/interference of AEG gun motors

    You say it is mainly affected when you move the guns with the pan & tilt?

    Try putting an "extension cord" on the compass, and put it on the desk 3 feet behind the rover. Then move the guns. If...
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    Re: PhantomX using a Teensy 3.1

    Actually, with my board, each connector has a Vcc (5 volts) and ground, in addition to the signal pin(s). That's why I used 0.05" spacing connectors - I wouldn't have room for the 10 connectors...
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    Re: PhantomX using a Teensy 3.1

    My Teensy carrier board I ordered from OSH Park finally (after five weeks) showed up today.

    5310

    I've got a bunch of 0.05" spacing Hirose connectors on it:

    6-pin (x2) - PWM control of motors...
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    Re: PhantomX using a Teensy 3.1

    KurtEck,

    I have a Teensy 3.1 also, and am putting it into MicroCrawler (http://forums.trossenrobotics.com/showthread.php?6574-Micro-Crawler) for now, at least until I get my MicroPython board. If...
  35. Re: 3D printing Who in the community owns or uses one ?

    If you haven't already, go out and buy the Make 3D printer guide: http://makezine.com/volume/guide-to-3d-printing-2014/

    Definitely worth reading.
  36. Re: 3D printing Who in the community owns or uses one ?

    Well, that's the eventual goal. So far I've printed probably 40-50 of them.

    Here's a picture of a bunch of 12 I sent out just before the Christmas break, along with 12 ammeters (also in a small...
  37. Re: 3D printing Who in the community owns or uses one ?

    We did the cost analysis for our project (printing 200+ battery harnesses), and it made more sense to pay $10K and own the printer. Having the printer beside me saves an enormous amount of time while...
  38. Re: 3D printing Who in the community owns or uses one ?

    I've never used Shapeways - their shipping is too slow to Canada, and it costs too much. I have no idea what one of their SLS nylon printers cost, but I'll bet its significantly more than the $10K...
  39. Re: 3D printing Who in the community owns or uses one ?

    This is why I don't like non-ABS printers, especially the resin-based ones...

    This is a part I printed on an Objet about 4 years ago:

    52695270

    The material is really important. Stuff I...
  40. Re: 3D printing Who in the community owns or uses one ?

    I used to have a Dimension uPrint, but I sold it. I built a lot of robot parts with that printer, but of course the cost was ridiculous. You can't beat the quality or repeat-ability though. I sold it...
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