Cubestormer 3, a robot made from Lego parts, has solved a Rubik’s Cube in just 3.253 seconds. At the recently held Big Bang Fair in Birmingham, UK, the puzzle-solving machine smashed the previous world record of 5.27 seconds, set in the fall of 2011 by its predecessor. The robot is powered by an ARM processor in a Samsung Galaxy S4 smartphone.
The new world record is the result of 18 months of effort by co-inventors David Gilday and Mike Dobson who worked on the project in their spare time.
“We knew Cubestormer 3 had the potential to beat the existing record but with the robot performing physical operations quicker than the human eye can see there’s always an element of risk,” said David Gilday. “In the end, the hours we spent perfecting the robot and ensuring its motor and intelligence functions were properly synchronized paid off. Our big challenge now is working out if it’s possible to make it go even faster.”
The robot employs intelligence from a Galaxy S4 powered by an Exynos 5 Octa application processor with an eight-core ARM big.LITTLE implementation featuring four Cortex-A15 and four Cortex-A7 processors.
The phone analyzes the cube, calculates the correct sequence of moves and instructs four robotic hands to do the manipulations. ARM9 processors also power the eight Lego Mindstorms EV3 bricks which perform the motor sequencing and control.
David Gilday added: “The robot demonstrates just how fast a Samsung Galaxy S4 can think. As well as working out the solution, the ARM-powered Exynos processor has to instruct the robot to carry out the moves. This is more complex than it seems because Cubestormer 3 uses a speed cube which allows twists before the sides are fully-aligned.”