Smart Basketball Analyzes Shooting, Dribbling

Charles Murray

March 19, 2013

4 Min Read
Smart Basketball Analyzes Shooting, Dribbling

A new smart basketball can measure the arc and backspin on a shot, or the speed and force of a player's dribbling. "Now, when coaches say, 'Your left hand is weak,' they can prove it," Mark Davisson, president of InfoMotion Sports Technologies, told Design News. "The ball doesn't lie."

Known as the 94Fifty, the smart basketball employs a combination of nine sensors -- including accelerometers, gyroscopes, and a magnetometer -- to gather 6,000 pieces of data per second and send them to a processor for analysis. Designed by engineers at Infomotion, it incorporates the sensors, along with a digital signal processor, a Bluetooth communication system-on-chip (SOC), and an inductive power charging antenna inside the lining of the ball.

Click on the image below for a close-up look at the 94Fifty.


When a player shoots or dribbles the 94Fifty, onboard "event recognition" algorithms take inertial data from the sensors and determine what's happening. Accelerometers provide force information, gyroscopes supply angular rate data, and the magnetometer determines magnetic north and provides directional information.

Taking all the data together, the ball is then able to tell how much force and control players have while dribbling, how much arc or backspin they have on a shot, or how long it takes for them to catch and shoot. After gathering the information, it sends it via Bluetooth wireless to a smartphone or tablet computer, so players can view data seconds after it's been measured.

"We have an app that visualizes the information in real time," Kevin King, vice president of engineering for InfoMotion, told us. "You can take a shot, and as soon as the ball hits the floor afterward, the information is there."

InfoMotion initially developed the technology about two years ago, selling the basketball along with a laptop computer to teams for more than $2,000. Users included high schools, colleges, and at least one pro team. Over time, however, the company's engineering staff was able to incorporate the software and hardware inside the ball and cut the price. A consumer ball, for use by an individual, is expected to be available by October for $295.

"We realized there was a market for kids to take the ball into the driveway and do their own drills without a coach," King told us.

InfoMotion teamed with Texas Instruments on the development of the consumer ball. TI engineers provided a C5000 digital signal processor (DSP), a Bluetooth/Bluetooth Low Energy communications SOC, and a Qi-compliant wireless power technology system that enables the ball's onboard battery to be charged without plugs or wires.

"We had to miniaturize the sensing and processing technology, then figure out how to get it inside the ball," King said. TI helped InfoMotion engineers put the technology on a postage stamp-sized printed circuit board that fits inside the lining of the ball. "The last thing we added was the wireless charging capability, so the ball could be sealed and the technology would be seamless to the customer."

King told Design News that the company's engineers used a DSP chip, instead of a conventional microcontroller (MCU), because the DSPs they looked at could execute four operations per clock cycle, compared to just one for an MCU. "It's all about number crunching," he said. "To do the same thing with a microcontroller would have taken a processor that was four times faster."

With all of the electronics technology incorporated on the small PC board, InfoMotion's team then designed an enclosure that would fit just under the skin of the ball but still be able to protect it from shock and vibration. "Our goal was to make it so you can't tell we did anything to the ball," King said.

The company is considering other sports applications for the electronics platform, including soccer balls and kettle bells for health clubs. "If someone comes to us and says, 'We'd like to put this in a bowling ball,' we would use the exact same electronics platform," Davisson said. "Our core competence is writing the algorithms for different kinds of applications."

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About the Author(s)

Charles Murray

Charles Murray is a former Design News editor and author of the book, Long Hard Road: The Lithium-Ion Battery and the Electric Car, published by Purdue University Press. He previously served as a DN editor from 1987 to 2000, then returned to the magazine as a senior editor in 2005. A former editor with Semiconductor International and later with EE Times, he has followed the auto industry’s adoption of electric vehicle technology since 1988 and has written extensively about embedded processing and medical electronics. He was a winner of the Jesse H. Neal Award for his story, “The Making of a Medical Miracle,” about implantable defibrillators. He is also the author of the book, The Supermen: The Story of Seymour Cray and the Technical Wizards Behind the Supercomputer, published by John Wiley & Sons in 1997. Murray’s electronics coverage has frequently appeared in the Chicago Tribune and in Popular Science. He holds a BS in engineering from the University of Illinois at Chicago.

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