LOCAL MINISUMO TEAMS - If you are looking to buy a Cobra MiniSumo Chassis for the SIAST MyRobot Rumble, Express Hobbies in Saskatoon will be selling them for us while we are away! (Their website is new so give them a call at 306-954-3434.)
• Designed to be a competitive entry into the masters class of mini-sumo, this chassis has the ability to beat those big-wheeled servo bots every single time.
• Includes 4WD Gold Spark motors, four high-traction mini-sumo wheels, two on-board motor controllers, three QTI line sensors, stainless steel scoop, heavy steel ballast, screws, wrenches, and stand-offs for mounting your control board!
• The Cobra now includes two on-board motor controllers, three QTI analog/digital line sensors, and a bright blue LED power indicator.
• Special introductory price - may go up at any time!
The Cobra conforms to the mini-sumo ruleset of RoboGames
, the world's largest robot competition. Most events uses these rules, but always check with your event organizer to make sure.
Width: 9.9cm (3.90")
Length: 9.75cm (3.84")
Height (ground to top of standoff): 3.77cm (1.48")
Weight: 333grams (11.75oz) - Maximum allowed in competition is 500g (17.63oz)
||The Cobra baseplate is a circuit board that has mounting holes for the scoop, ballast and standoffs. The newest revision includes on-board motor controllers, QTI line sensors (two front, one rear), and a bright blue LED power indicator.
||Four 50:1 Gold Spark Gearmotors are epoxied and soldered in place.
||The Cobra has two on-board motor drivers (left and right). To operate them, you will need to connect their DIR (direction) and PWM (speed) pins to a microcontroller. For DIR, 5V is forward direction and 0V is reverse. The PWM pins require a 5V pulse-width-modulated waveform for smooth operation.
||Four FingerTech Mini-Sumo Wheels. Shore A20 polyurethane - the highest traction mini-sumo wheels available.
||Includes three QRD1114 line sensors (2 front, 1 rear) wired into QTI configuration for digital or analog operation. Three headers connect to your control board. A circuit diagram is printed on the pcb.
||0.020" stainless steel angled scoop (can be legally sharpened to 0.010")
||An underweight mini-sumo is at a disadvantage! This steel ballast keeps the center of gravity low.
||Four 6-32x0.375" screws for mounting the scoop, ballast and stand-offs. Four for securing circuit board to standoffs. Four washers for spacing ballast fro
Two hex wrenches included for tightening screws and setscrews.
||Full-color assembly steps, wiring diagram, header pinouts, and sensor/motor controller instructions. Cobra_instructions_R2.pdf
||The chassis has a spot to accomodate a 44x24x29mm (1.75x0.93x1.15") battery. Our Rhino 11.1V 360mAh or Nanotech 11.1V 180mAh fit perfectly and will run the robot for dozens of matches. Min/Max Voltage: 6V-16V.
||In the chassis kit, the brains are up to you. We carry the user-friendly Arduino Uno's, but boards from the SumoVore, Mark III, or SumoBot will all work. Use the PCB Mount Kit to fit boards with different hole patterns.
||Opponent detection can be anything you desire. Infrared emitters/sensors are most common, but ultrasonic sensors are an option too.
Orders normally ship within 1-2 days. Other Gold Spark motor ratios
can be used for an additional $10 fee - please add a note in the checkout comments. (35:1 is the most commonly used after the default 50:1, but make sure your sensors can react fast enough to the increased speed!)