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  1. Discussion Re: What would hou do if you could have 1ms loop on the whole robot?

    Hi Xevel, any update on this?
  2. How is the Robotis Dynamixel XH/HM/XL Series compared with the M Series?

    Hello, anybody used both series of motors? How the X Series compared with the M Series in real use?
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    Question(s) Re: How often to recharge LIPO battery?

    Thanks. Assuming that I do a 50% storage charge now and when I need to use the battery again, should I recharge it more?
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    Question(s) Re: How often to recharge LIPO battery?

    Thanks jwatte and Zenta. I bought a SKYRC iMax B6AC version 2 AC/DC Dual Power Professional Balance Charger/Discharger. Have not used it before. Is there a step-by-step guide on how to do what you...
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    Question(s) How often to recharge LIPO battery?

    Hello, is it a good idea to recharge LIPO battery every time after use? How often should we do it?
  6. Re: Oscilloscope and function generator for robotics research

    I have been thinking about this. If the MSO in even the 3000XT is not as good as the Saleae Logic Pro, then there is less motivation for me to get such an expensive oscilloscope.
  7. Re: Oscilloscope and function generator for robotics research

    I have seen some very nice videos of the Saleae Logic Pro. Thanks all for the suggestion. I am now considering Keysight and scopes from other companies. Keysight has a special offer of getting MSO at...
  8. Re: Oscilloscope and function generator for robotics research

    Thanks. Is Logic Analyzer (LA) = data logger + more?
    Am I correct that the LA of Oscilloscope only take 0 and 1 but the Logic Pro 16 can take all 16 analog trains of analog signals if I want?

    The...
  9. Re: Oscilloscope and function generator for robotics research

    I think GW-INSTEK is a Taiwanese company. I have used Agilent products at school before. They are quite good. I guess one advantage of using the Agilent is that the specs could be upgraded later.
    ...
  10. Re: Oscilloscope and function generator for robotics research

    Looks like I may need to pay a bit more. In terms of amounts of noise and quality of input stages/amplifiers, how is Keysight's scopes compared with the GWINSTEK's and the others?


    Is 70MHz...
  11. Re: Oscilloscope and function generator for robotics research

    Thanks for sharing your experience.
  12. Re: Oscilloscope and function generator for robotics research

    Thanks. From the website, for the 4-Channel ones, it costs only an additional US$40 to go from 100MHz to 200MHz.
    However, it costs US$380 to go from 70MHz to 100MHz. Not sure if it is worth to get...
  13. Re: Oscilloscope and function generator for robotics research

    Thanks for your reply. My computer does not have USB-3 port. I plan to buy a new computer this Fall.

    I did some work using a 4 channels scope in the past. I need to see the relationship between...
  14. Re: Oscilloscope and function generator for robotics research

    Thanks. In case I want a 4 channels scope with storage, which products do you recommend?
    If I have the Saleae Pro 8 or 16, I can just use a 2 channels scope rather than a 4 channels one? Not sure if...
  15. Re: Oscilloscope and function generator for robotics research

    I gave my Fluke 123 to my relative. I need to buy a new one. Any other good product suggestions?
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    How useful it is to use ROS?

    Do you find it useful to use ROS with the HR-OS1?
  17. Re: Oscilloscope and function generator for robotics research

    Thanks. For robotics research, what features of the scope would be good to have? For example, sampling rate?
  18. Re: Oscilloscope and function generator for robotics research

    I already have the Fluke 123 but the probes are missing. Considering to buy the probes or get another scope.
  19. Re: Oscilloscope and function generator for robotics research

    It seems that the logic analyzers require a computer. Do they slow down the computer? What do you guys think of the Fluke 123? I haven't used it for many years. As far as I recall, the display was...
  20. Oscilloscope and function generator for robotics research

    Hello, I am in the process of setting up a lab at home to do high end robotics research.

    I have a Fluke ScopeMeter 123 and a Kenwood FG273A function generator. The probes of both are missing. I...
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    Some questions about LIPO

    Hello, I connected a LIPO to a motor driver. In between the two, I have a switch to turn off the power. I also use a separate power source and a switch for the microprocessor which is connected to...
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    Re: When do we use a LIPO monitor?

    Thanks wadecore
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    Re: When do we use a LIPO monitor?

    Thanks jwatte. When the battery monitor beeps, I should charge the LIPO. Am I right?
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    When do we use a LIPO monitor?

    Hello,

    In the LIPO Guide

    http://learn.trossenrobotics.com/index.php/getting-started-with-the-arbotix/11-lipo-battery-guide

    it states that "We recommend that you attach your Battery...
  25. Re: Arbotix Pro or Ordex with usb2ax to control dynamixel MX and possibly upcoming new version of dynamixel

    I need some way to store the motor information (such as a time series of real rotational angle of all motors) for later analysis. If possible, I hope to be able to do real time feedback control.
  26. Re: Arbotix Pro or Ordex with usb2ax to control dynamixel MX and possibly upcoming new version of dynamixel

    If I don't know how to send telemetry over USB serial or over wireless serial, what other option do I have?
  27. Re: Arbotix Pro or Ordex with usb2ax to control dynamixel MX and possibly upcoming new version of dynamixel

    I recall that one of the limitations of the OpenCM-9.04 is that there is no support for sdcard and one has to do all the development. Is it still the same for sdcard and telemetry?
  28. Arbotix Pro or Ordex with usb2ax to control dynamixel MX and possibly upcoming new version of dynamixel

    Hello, given that the Arbotix Pro and a new version of Odroid are available, I would like to get your opinion on which controller to use to control 20-30 dynamixel MX motors. The workflow is as...
  29. How to make beautiful, smooth cut of curved shapes made of EVA foam?

    Hello, I want to make shapes using EVA foam of 10mm thick. I used sharp cutter but it was difficult to make absolutely vertical cut of curved shapes. I tried laser cutter but it leaves dark burned...
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    Re: How to take nice photos of robots?

    Thanks. If the robot is of dimension WxDxH, about how many percentage larger should the light-box be? Any suggestion on the type of white sheet to use to cover the light-box? In one of the link that...
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    Re: How to take nice photos of robots?

    Thanks. A sales person suggested getting two LED lights of 60W. Is that good enough?
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    How to take nice photos of robots?

    Hello, I have seen some very nice robot photos on this forum. How to take nice photos of robots that have reflexive metallic body? When I turned off the flash of my phone, it became too dark. When I...
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    Re: Device to monitor battery

    Thanks tician and KurtEck. I better get one.
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    Device to monitor battery

    Hello, sometimes after demo or competition, I see people taking out the battery from their robot and connected it to some kind of small measurement device. What is that? Why they monitored the...
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    Re: mAh or C. Which is more important?

    Thanks for all.
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    Re: mAh or C. Which is more important?

    Thank you. Hobby King only allows two payment methods: PayDollar (No Paypal) + 2.93% and Paypal Pay by VISA. I heard lots of horrible things about Paypal when troubles come. Never heard of PayDollar....
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    Re: mAh or C. Which is more important?

    I would prefer a genuine charger that can charge quickly. As I read, cheaper ones could cause the LIPO to die sooner or cause fire.

    Is HobbyKing a reputable store? Are Zippy and Turnigy reliable?...
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    Re: mAh or C. Which is more important?

    I would prefer one that can do fast charge and can charge 2S to 3S batteries. Currently there is no plan to use 4S but who knows. Most likely I will use Zippy or Turnigy. I don't care too much about...
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    Re: mAh or C. Which is more important?

    Thank you all very much for checking.

    In my example, do higher C values (e.g. 30C, 50C) has any effect?

    Am I right that I should compare batteries basked on mAh, size and weight rather than...
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    Re: mAh or C. Which is more important?

    Hi jwatte, Thanks for the examples. In your two examples, how come 210g lets you choose 2000mAh batteries at 11.1V and 800g at 14.8V lets you choose up to 7000mAh?

    Let's check my understanding...
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