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Using high-powered motors requires high-powered motor controllers The motor controllers are commonly called electronic speed controllers (ESCs) In mini sumos, the peak motor current requirements are usually around 1 A For the international robotic sumo class, peak motor current demands can exceed 100 A This really depends on the type of motors selected for the sumo bot Usually, higher-voltage motors require less current The most cost-effective ESCs are the ones made for the R/C racing car industry These controllers are designed to handle large amounts of current for short periods of time They are also easy to integrate into a sumo bot When looking at electronic speed controllers, make sure that yours has a reversible speed controller More than half of the electronic speed controllers made today are for forward use only A sumo bot will be spending about half its time going backward as compared to going forward The other factor to consider is the current handling capacity when operating in reverse Of the ESCs that are reversible,

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about half of them have lower current ratings in reverse than in forward You will need an ESC that has the same capabilities in forward and in reverse Most ESCs advertise the peak current capacity This is a very misleading value It is usually a theoretical value under ideal operating conditions, and not to exceed that value for more than one second In reality, if the motors are drawing current near this advertised value for more than a few seconds, you will let the magic smoke out of the ESC, and it will stop working Since sumos spend a lot of their time pushing other robots around, the motors will be drawing near maximum current for long periods of time Because of this, you will need to look at the 30-second and 5-minute current ratings of the ESC The ideal ESC will have a 30-second current rating greater than the stall current of the motor Obtaining this information usually means contacting the manufacturer One method to obtain a little performance improvements out of the ECS is to add a cooling fan above the heat sinks on the ESC Generally, the R/C style electronic speed controllers are the easiest and most cost-effective solution to driving the motors These controllers can be found at most hobby stores Another source for electronic speed controllers is using H-Bridge type controllers There are many companies that sell a wide variety of these types of controllers One of the big differences in these controllers is that they accept a true pulse-width modulation (PWM) signal to vary the motor speed, which can give you better speed, braking, and direction control resolution Many bot builders build their own version of a high-powered speed controller using MOSFET power transistors Although this can be done, it is generally a difficult task to produce a reliable controller In the end, off-the-shelf speed controllers are less frustrating and cost less to implement.

Position location, 6 Inches; tracking, omnidirectional messaging Internet access, 20-cm, fixed voice, video, data

Advanced Sensors Because the international robot sumo class is much larger than the mini sumo class, there s a lot of extra room for sensors Most international sumo bots use more than one type of sensor The edge-detection sensor is still used Some bots use more than two sets of these, and some bots even have them on their backs to detect whether they are being pushed out to the sumo ring The infrared object-detector circuit is very popular, and is used on the larger sumo bots A new type of sensor that is used on the larger sumo bots is the range-detecting sensor The two most common methods used are ultrasonic sensors and infrared range detectors

Internet access, Dual 20-cm Teledesic, voice, video, data, tracking antennas, Skybridge, videoconferencing fixed Celestri, Cyberstar

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Ultrasonic range detectors are becoming more popular because they are becoming more widely available They work by measuring the time of flight from a sound signal being reflected off an object The object s distance is computed by multiplying the measured time by the speed of sound in the current air conditions For robotic sumo applications, any returned signal outside 5 feet can be ignored because