scolton
scolton tells the story of building a robot for the FIRST robotics league.
Visit Show Website http://scolton.techtv.mit.eduRecently Aired
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Auto-Gyro-Twitch
This video demonstrates some upgrades to Twitch, Jr., my linkage-drive ...
This video demonstrates some upgrades to Twitch, Jr., my linkage-drive robot. It was pretty difficult to drive, so to help I added a yaw rate sensor (gyroscope) and a heading control loop. I also added a mode that automatically selects the wheel positions based on a single joystick input. For more information, click here.
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Cap Kart 2.0: 8/7/2010 Test Drive, Conquering the Turn
Okay, so it's not the fastest or most impressive test ...
Okay, so it's not the fastest or most impressive test drive we've ever had. (The kart suffered a[nother] MOSFET failure after a few runs.) But it highlights one of the new features: a custom-built rear axle differential. With this addition, and savings of about 100lbs by switching to lithium-ion batteries, it easily navigates the slalom course. Back in 2008, clearing the u-turn was nearly impossible even at low speeds. Don't ask why Elmo is used as a slalom cone. For more info about the Cap Kart, see http://web.mit.edu/first/kart.
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Edgerton Center Engineering Design Class 2010: Project Highlights
This summer's Edgerton Center Engineering Design class produced four awesome ...
This summer's Edgerton Center Engineering Design class produced four awesome projects in four weeks: - A functional RC quadrotor built with commonly-available RC equipment and an Arduino microcontroller board. - A 4x3x(8x8) LED matrix screen capable, among other things, of playing accelerometer-based pong. - An illuminated polycarbonate-based makeover of the DIY self-balancing scooter featured in 2007, also with functional steering. - A lighter, faster, and more maneuverable Exkate-based electric longboard. What did you do this summer??
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Cap Kart Summer '10 Rebuild - Rear Axle Spin-Up
The improved Cap Kart now has lightweight lithium-ion batteries and ...
The improved Cap Kart now has lightweight lithium-ion batteries and a custom rear differential. This is mostly a test of the rebuilt rear axle, but also always good to make sure the controller still works, since it's cursed. Next order of business: test driving.
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Imprecise Aggressive Maneuvers for Remote Control Quadrobots (a.k.a. Twitch, Jr.)
This is the very first test drive of Twitch, Jr. ...
This is the very first test drive of Twitch, Jr. It's named after its larger predecessor, Twitch, built by FIRST Team #1565 in 2008 (video). I'm not associated with 1565...I just decided I had to make a small Twitch. The "linkage drive" and omni-wheels allow it to take several different robot drive configurations, including standard, wide, and diamond layouts. With practice, it should be able to move seamlessly from one configuration to another. With practice... For more information, click here.
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HexBridge Shield Demo
This is a high-power motor drive shield that I designed ...
This is a high-power motor drive shield that I designed for the Arduino. I'm testing it on a large separately-excited DC motor from the Cap Kart. It has six semi-independent outputs, three of which are controlling the armature winding and two of which are controlling the field winding.
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Custom ESC: Field Weakening Test
This is a test of the brushless ESC I built ...
This is a test of the brushless ESC I built for my 1/10-scale RC car. It uses sinusoidal AC commutation and field-oriented control, which dynamically adjusts the timing of the motor to optimize torque. As an extension of this control method, it can also run at other operating points that sacrifice torque for more speed. It does this by using some current to fight the permanent magnets, reducing back EMF and allowing the motor to spin faster at a given supply voltage. This is called field weakening.
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Twitch, Jr.
A SolidWorks rendering of the linkage-drive robot I'm building. It's ...
A SolidWorks rendering of the linkage-drive robot I'm building. It's based on "Twitch...the missing link(age)," FIRST Team 1565's 2008 robot, which you can see in action here: 1565 Build Video 2008 1565 Drive Test 2008 I'm not affiliated with Team 1565, and I don't even know that this is how their linkage drive works. But ever since I saw those videos I've wanted to build one!
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Rookie vs. the RC Car (...in slow motion.)
Rookie (the dog) likes to chase squirrels. RC cars look ...
Rookie (the dog) likes to chase squirrels. RC cars look like squirrels, I guess.
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Pirate Radio Control: Custom RC for a 4WD 1/10th Scale
This is the first test drive of my modified 1/10th ...
This is the first test drive of my modified 1/10th scale RC car. It can reach a top speed of nearly 40mph with this gearing. It does 0-30mph in 2.2 seconds. More information. The car is a Team Associated TC4 RTR. Modification I made include: - Switched to a cheap but excellent sensored brushless motor. - Added my own true AC (sine wave) controller and two-way 2.4GHz system. - Added a 19.8V LiFePO4 battery pack.
