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2014 Frc Aerial Assist Robodox 599 Robot ready to compete.

Robodox performs well at 1st Week FRC Inland Empire Regional.

Making Fat Shark FPV goggles work with OPENROV ($7 solution ?).

OpenROV debuts during Algalita 2014 POPS International Youth Summit at Dana Point Ocean Institute.

60 in double reverse 4 bar linear linkage example.

Reblog:New scientific study on plastic entering the ocean.

Vex Note: Motor power required to launch balls.

Team 2826 ,Wave Robotics, built one of my favorite robots for 2015 FRC Recycle Rush.

Finding the moment of inertia of a Vex wheel using parallel axis theorem.

Vex Note: How a single flywheel ball shooter minimizes the effect of ball mass variations.

Energy ratio method for quantifying effect of ball mass variations on range error of a flywheel ball shooter.

Dynamics of the centrifugal governor : Lagrange method with Vex simulation example.

Steamworks 2017 FRC touchpad mockup using vex parts.

RC bouy ….saves lives and would be great for other ocean research that requires a robust platform.

Flying Fire Hose blog #2 IO Hawk Hoverboard Teardown.

Still working on getting something similar. Kind of like a mini Eas圜 On-line window that uses the Vexnet joystick buttons.Īlthough the debugger works good, I still miss the printf function capability. This is used to check the static and dynamic friction commands and determine the adjustments necessary to balance motor speeds. It also computes the speed if an encoder is hooked up. Wrote a motor test routine that gives you the capability to select a motor port and generate a constant command by using the Vexnet Joystick buttons. Hooked up a quad encoder and ROBOTC routines output 360 counts per revolution rather than the usual 90 cnts per revolution we are used to with MPLAB.

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This new software also fixes the Vexnet Joystick bias problems. Got the CORTEX back from Vex and loaded the new ROBOTC 2.20.1 that fixes the H-bridge problem that smoked it. Vex will RMA and fix CORTEX under warranty(whew).

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So download the next ROBOTC beta version and should fix the problem. Update: 6/30 Talked with Vex support and there is a problem with ROBOTC beta 2.16 that can cause excessive currents to blow the PWM due to a pass through on startup.

Will talk to Vex support and see what can be done to repair. I think the big motor current transients were too much for it. The processor works ok, the discretes are working…but all the pwm drives are toast. Takes about 6 seconds to lift once the initial grip is established.Īrrrrrgh! Fried the new cortex today. Uses 4 big motors (2 wire) on the lifter, 2 servos, and only 2 direct drive motors. It has a plunger and a pincher which allow it to quickly pick up and deposit tubes and also take a few tubes off a goal if need be. Has 38 inch reach with a dual bobcat type linear slides. Also a known bug.īuilt a prototype High hanging robot that tries to do it all. ROBOTC has no autosave after compile even if checked. Have yet to figure out the game joystick driversįixed the Joystick problem. The game joysticks did not work, except for channel 3. With the 75mhz legacy controller, got the expected results. I updated the firmware again per instructions and tried the operator controller. I now could download programs ok and not sure what cured the problem. The high pitched whine was about two octaves above middle C so I’m guessing about 1 khz hbridge pwm frequency unless it was a harmonic. The deadzone appeared to be +_8 pwm units when driven with a two wire port and around +_10 pwm units when driven from a regular motor port with the motor adapter. The motor seemed to run uneven and the max speed was noticibly slower going in reverse than forward. I hooked a two wire motor up and enabled the OnLineWindow and finally got it to work.

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I reinstalled the Prolific drivers from the Vex website (should be the same) and updated the firmware from the Easy C 4 START menu ( “C:\Documents and Settings\All Users\Application Data\Intelitek\IFI VEXnet Firmware Upgrade\usbhidio.exe) per instructions for both to the controller and the Vex game pad using the tether USB connected to the PC.

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I decided to get the Cortex running using the Eas圜 4 Cortex trial CD that came with the cortex. “ Bootload failed: Controller failed to respond to autobaud sequence“, repeatedly. Tried to download firmware and ran into this message:

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Installed the prolific serial driver from the RobotC web site. Downloaded the beta version ROBOTC 2.16 and followed instructions using the tether mode. Decided to use RobotC for initial installation and setup.