• 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 garolite chassis, steel chassis ballast, 4x Spark motors, polyurethane mini-sumo wheels, line sensors, circuit board stand-offs & screws, and a stainless steel scoop.
• The Cobra now includes on-board circuitry turning the three QRD1114 sensors into QTI (Charge Transfer Infrared) sensors which can be used as both analog or digital line sensors.
• Simple servo connectors interface with your control board. The schematic is drawn on the board and sample code is provided.
• We have also pre-wired the motors in parallel to make building your Cobra even easier!
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)
||1/16" thick garolite baseplate (pic). Has mounting holes for scoop, standoffs, and QRD1114 floor sensors (2 front, 1 rear).
||4x 50:1 Gold Spark Gearmotors
||4x 1.125" mini-sumo wheels. Shore A20 polyurethane - the highest traction mini-sumo wheels available.
||Includes three QRD1114 floor sensors (2 front, 1 rear) wired into QTI configuration. 3-wire cables connect to your 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.
Two hex wrenches included for tightening screws and setscrews.
||The chassis has a spot to accomodate a 26x53x26mm (2x1x1") battery. Our Nanotech 11.1V 180mAh fits perfectly and will run the robot for dozens of matches. Some Velcro will secure it in place.
||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.
||If your "brain" does not include motor drivers, two tinyESCs can be used (1 per side). They are very small and can be controlled using simple Servo PWM - only one data line each is required!
Orders normally ship within 1-2 days. Other Gold Spark motor ratios
can be used - 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!)