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    Re: Taking a journey with python3

    The routine appears to be constructing and sending a command to a servo. If you look at the Dynamixel AX-12 servo documentation the actions of the code will become more clear. You'll want the...
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    Discussion Re: All about multi-legs robots gaits

    This was a problem for me, as it led to awkward, sliding stops. I did or want to do these:
    * In all cases I control how fast I implement a speed change
    * If the stick inputs go away (comm error) or...
  3. Question(s) Re: Dynamixel AX-12A won't actuate if the chain is longer than 6

    For my Hexapod I'm using AX-18's. At 2 amp stall current per servo, that adds up to 36 amps. Obviously they're not stalled all the time, but to me this is FAR beyond the standard power wiring...
  4. Question(s) Re: Dynamixel AX-12A won't actuate if the chain is longer than 6

    Ditto what Tician said about wiring harnesses! I make mine from 14 ga solid copper house wiring, and my feed from battery to this harness is always at least 14 ga.

    The 1 Mb data signal is noise...
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    Re: DynaManager Not Finding Servos

    I used to have big problems with inconsistent access and control of the AX-12 servos. Things became much more stable when I stopped assuming everything was ok at startup. I revamped initialization...
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    Re: Project of robotic Arm with dynamixel motors

    I've watched the video. When the top are is upright it doesn't seem to move any faster. Based up this observation I don't think the servos are slow because of loading issues.

    I also see you have...
  7. Question(s) Re: USB2AX sync writes to 2 servos but not 3+ (USB2Dynamixel does)

    Along with swapping the end-of-chain server with the second-from-end servo - to see if the problem changes.

    And I'll second JWatte's recommendation regarding Saleae Logic Analyzers. Tools such as...
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    Re: Money Pit V for Victory

    Quite impressive! If that was 2/20 then they need to work on the scoring!
    Wheels falling off: Are you ramping the speed changes? I was wondering if the jolt of a hard speed change would loosen the...
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    Re: TTL bus has a mysterious pulse on it

    Keeping in mind how adamant the Roboclaw folks are about placing external caps near their boards, I'm not surprised that extra caps quiet things down on these Dynamixel servos. They're are awfully...
  10. Question(s) Re: Advice and opinion about Phantom X for use in theatrical performance

    Jwatte - that was very useful info. I had to do the math myself - 100 Watt/hours at a nominal 12v is about 8300 ma/hours. So I'll be legal hand-carrying 5200 mah batteries to RoboGames 2018 ! Yay!
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    Project Re: Xl-320 Based Hexapod

    Very nice to see - and impressive! Keep the photos coming!
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    Re: YATB - Yet Another Teensy Board :D

    All that UV and dust is hard on my sensors!
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    Re: Wiring / buss management?

    Let us know what you come up with, will you? I ended up making a custom wiring harness for the hexapod using 14ga solid-conductor house wiring and heat-shrink. It serves its purpose, but wouldn't be...
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    Re: Do I need thrust washers inside snap rings?

    The axle will "work" against the outer flange, won't it? Since you already have them, a second set of flanged bearings, shoulder-out, will let the axle float, remaining captured by the snap-ring...
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    Re: Some love for the Money Pit

    This is my hobby in a few words: "Overkill", and "But it was fun to make" !!! It is fun!

    And you can't have too many RoboClaws!
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    Re: Some love for the Money Pit

    Holy cow! That thing's a monster! It looks like it could climb Mt. Everest!

    I can see why an AX-12 would have trouble rotating the wheel assembly. You're the one that introduced me to the...
  17. Project Re: Quadbot 17 - Quadruped robot designed in Autodesk Fusion 360

    Up vote!
  18. Project Re: Quadbot 17 - Quadruped robot designed in Autodesk Fusion 360

    I took JWatte's advice and purchased one - it showed up last week. Just in time to debug NeoPixels driven by Teensy FTM and DMA. They'll have to bury it with me, as I'm never giving it up!
  19. Question(s) Re: [AX12/MX28]-Get position by moving manually the motor

    That link is cool! Linked arms, one tracking the other...
  20. Question(s) Re: [AX12/MX28]-Get position by moving manually the motor

    Set the servo to zero torque, and read the servo's position whenever you want. This works just fine; I use this approach during startup to determine my hexapod's leg positions so it can rise...
  21. Project Re: Quadbot 17 - Quadruped robot designed in Autodesk Fusion 360

    Need pictures!
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    Re: Falling-Up Robot Project

    :wink:
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    Re: 2017 Robogames Mech Warfare Qualifying

    Congratulations! Loves the Rest and Power Off!
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    Re: Numa V2 - Quad Mech

    Connectors are how Murphy emerges from his evil lair. Consider cutting the connector off the servo wire and soldering all three wires to the board...
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    Re: 2017 Robogames Mech Warfare Qualifying

    Outstanding!
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    Re: Looking for: Hydrabus

    A Teensy might be a good substitute...
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    Re: Self-erecting, self balancing 'bot

    6954

    First assembly of development 'bot.
    * I've canned my original plan to use steppers as they get HOT, and, not knowing any better, I bought 12v steppers so they can't be micro-stepped very...
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    Re: Onyx X build thread

    I would think it would be ok; and it would be quick work to test it. I use a daub of RTV myself.
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    Re: Self-erecting, self balancing 'bot

    From ION: Subject: Ion Motion Control: Update Tracking #427

    Yes, these are planned. They are bridged on the pcb traces themselves and when the solder reflows will usually bridge across the pins....
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    Re: Self-erecting, self balancing 'bot

    I dropped a note to the folks at Pololu about it, and they reminded me that they may be deliberate. I've dropped a note to ION, and I'll see what they say before I start heating up the iron.
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    Re: Self-erecting, self balancing 'bot

    Just a head's up - I recently purchased a Roboclaw and have found a total of three solder bridges on it. I've dropped Pololu a note about it, and will remove them, but watch for them!
  32. Thread: Autocannon

    by Brooks
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    Re: Autocannon

    Oh, crumbs! I had a mental picture of a mech with a kitchen spatula sticking out in front... :happy:
  33. Thread: Autocannon

    by Brooks
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    Re: Autocannon

    Are we allowed to have a spatula to flip them onto their backs? Like a turtle?
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    Re: OpenCM 9.04, best way to beep?

    I was scrounging around on Amazon the other day and found my new favorite component:
    https://www.amazon.com/gp/product/B01M0PEGH8/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

    Its a 500Hz buzzer,...
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    Re: Self-erecting, self balancing 'bot

    I had to think back as to why I started with a separate "console" port. On my hexapod I wanted to be able to communicate with a RPi, hence the "console" port. Eventually I'll want to be able to use a...
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    Re: Self-erecting, self balancing 'bot

    I know! I currently have one for the FTDI debugging console, one for the Dynamixel servos, and one for an XBee. Needing to communicate with the motor controller brings me to four. It's a pity I can...
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    Re: Self-erecting, self balancing 'bot

    I looked into the RoboClaw series, and was delighted at what I found! Thanks for the head's up. I've just ordered one from Pololu. And the on-board +5 supply eliminates the need for a separate logic...
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    Re: Onyx X build thread

    I've been wondering if it would make sense to have one person driving (using one camera), while another operated a stabilized turret with its own camera and laser pointer. I would think it would be...
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    Re: How do I use the VNH2SP30 IC ?

    Oops! As you can tell, my thinking was stepper-centric for a while!

    But, I'm coming out of the darkness!
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    Re: Self-erecting, self balancing 'bot

    The best part of all this is how much I'm learning. Who knew, for example, that I'd be using high school trigonometry again?

    I think I'm going to punt and change to geared motors for the wheels....
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