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  • jwatte's Avatar
    1 Week Ago
    jwatte replied to a thread Making a mechanical gyro? in Sensors
    How fast can you spin that encoder before it starts losing steps?
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    10 replies | 3502 view(s)
  • jwatte's Avatar
    1 Week Ago
    jwatte replied to a thread Malum IK in Mech Warfare
    More crammed than this 33x50mm thing? Probably not on average, but the dual-rail buck converter area, and the video-switch-and-general-inverter...
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    69 replies | 14789 view(s)
  • jwatte's Avatar
    1 Week Ago
    jwatte replied to a thread Malum IK in Mech Warfare
    Not sure this is all that useful. The board is fairly crammed, so it's hard to tell from the CAD. Maybe I'll remember to take a photo when I get home.
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    69 replies | 14789 view(s)
  • jwatte's Avatar
    1 Week Ago
    jwatte replied to a thread Malum IK in Mech Warfare
    They didn't have QFN footprints to match, so I constructed them in KiCad using the recommended dimensions from the data sheets. Also: I use "QFN" to...
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    69 replies | 14789 view(s)
  • jwatte's Avatar
    1 Week Ago
    jwatte replied to a thread Malum IK in Mech Warfare
    I have used exactly this circuit to interface between Teensy 3.2 and 3.5 and the DXL bus, yes! The RX pin has a 560 Ohm / 1 kOhm resistive divider...
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    69 replies | 14789 view(s)
  • jwatte's Avatar
    2 Weeks Ago
    jwatte replied to a thread Making a mechanical gyro? in Sensors
    Oooh, that'd be awesome!
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    10 replies | 3502 view(s)
  • jwatte's Avatar
    2 Weeks Ago
    jwatte replied to a thread servo sequencing program? bipedal walker. in Mech Warfare
    Those are RC servos, using PWM control. You can generate such pulses from any of the Arduino boards, using the Servo library. I'd recommend using a...
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    2 replies | 782 view(s)
  • jwatte's Avatar
    3 Weeks Ago
    jwatte replied to a thread Mech Warfare at the NorCal Robotics Expo in Mech Warfare
    I'd like to attend if possible, too! Also, I'd like to help a bit, perhaps with scoring plates or somesuch. Maybe we can make an order to Macrofab...
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    5 replies | 1910 view(s)
  • jwatte's Avatar
    3 Weeks Ago
    jwatte replied to a thread Making a mechanical gyro? in Sensors
    That's what the magnetometer (and ideally also a GPS input) is supposed to help you solve, using some kind of Kalman conditioning. Another option is...
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    10 replies | 3502 view(s)
  • jwatte's Avatar
    3 Weeks Ago
    jwatte replied to a thread Making a mechanical gyro? in Sensors
    Optical flow from a camera to detect movement and orientation isn't half bad! You could get a NVIDIA Jetson something-or-other and a camera for it;...
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    10 replies | 3502 view(s)
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About jwatte

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    • Created by jwatte
    • Synopsis: A biped made with only three hobby servos
    • Created by jwatte
    • Synopsis: I'm converting a 10-year-old RC car (a Nikko humvee truck) to a RoboMagellan competitor for 2013 RoboGames. The main navigation is a pair of 1080p webcams set 40 degrees apart. Additional sensors and lost of computer power helps.