PR2

PR2 PR2 is a mobile manipulation robot platform developed to accelerate research in robotics, human-robot interaction, and autonomous systems. Conceived and produced by Willow Garage, PR2 integrated hardware from industrial robotics vendors with open-source software from the robotics community to enable research at institutions such as Stanford, MIT, Carnegie Mellon, and the University of Tokyo. The platform combined articulated manipulation, perception, and navigation capabilities to support projects ranging from domestic assistance to industrial automation.

Overview

PR2 was designed as a general-purpose research robot that combined the kinematic reach of industrial manipulators with mobile autonomy suitable for laboratory and home-like environments. The platform's design emphasized modularity and extensibility, pairing dual 7-degree-of-freedom arms with a wheeled base, parallel computing, and a sensor suite that included stereo vision, planar LIDAR, and tactile sensing. Willow Garage released PR2 alongside the Robot Operating System to promote reproducible research across academic and corporate institutions such as Google, Honda Research Institute, and NASA. PR2 platforms were deployed at universities including Stanford University, Massachusetts Institute of Technology, Carnegie Mellon University, University of Tokyo, and University of Washington.

Technical Specifications

PR2 featured two seven-degree-of-freedom arms with series elastic actuators and parallel-jaw grippers, enabling manipulation tasks similar to those performed by arms on industrial robots from vendors such as ABB, KUKA, and Fanuc. The mobile base employed a holonomic wheeled drive enabling omnidirectional motion for navigation in constrained environments like labs at Toyota Research Institute and Honda Research Institute USA. PR2's sensing suite included a SICK planar LIDAR for localization and mapping used in projects inspired by technologies from SLAM research groups at ETH Zurich and Oxford University; a stereo camera rig influenced by systems at CMU Robotics Institute; microphones and a Kinect-style depth sensor for perception work paralleling efforts at Microsoft Research and Google DeepMind. Onboard computation used multi-core servers running Ubuntu and the Robot Operating System, which integrated libraries and middleware from groups such as Willow Garage, Open Source Robotics Foundation, and academic labs at University of Pennsylvania. Safety features incorporated force/torque sensing and compliant control paradigms developed in the tradition of research by Oak Ridge National Laboratory and NASA Jet Propulsion Laboratory.

Development and History

Development of PR2 grew from earlier Willow Garage prototypes and experimental platforms that emerged from collaborations with engineers formerly associated with SRI International and Stanford AI Lab. Willow Garage announced PR2 and distributed early units to select research institutions in 2010, following milestones in open-source robotics set by projects like the initial Robot Operating System release. Early adopters included research groups at MIT CSAIL, Harvard John A. Paulson School of Engineering and Applied Sciences, and Brown University, which used PR2 to prototype manipulation algorithms derived from academic work at University of California, Berkeley and Georgia Institute of Technology. PR2 development intersected with advances in perception and learning from labs such as Berkeley AI Research, DeepMind, and Facebook AI Research, motivating community contributions to the software stack maintained by organizations like the Open Source Robotics Foundation. Over its service life, PR2 hardware and software iterations incorporated feedback from experiments in assistive robotics, multi-robot coordination at California Institute of Technology, and teleoperation studies at Imperial College London.

Applications and Uses

Researchers used PR2 for a wide array of tasks including autonomous navigation, object manipulation, human-robot interaction experiments, telepresence, and learning from demonstration initiatives. Projects at Stanford University and Carnegie Mellon University employed PR2 for manipulation benchmarks inspired by challenges from DARPA and industrial automation scenarios relevant to Siemens and Bosch. In assistive robotics, groups at University of Washington and Georgia Tech evaluated PR2 for activities of daily living research drawing on methodologies from National Institutes of Health funded studies. PR2 enabled demonstrations of end-to-end learning approaches influenced by work at UC Berkeley and DeepMind for grasp synthesis and visual servoing, while laboratories such as MIT Media Lab explored social robotics behaviors and telepresence use cases akin to experiments at Sony CSL. Additionally, PR2 served as a demonstrator platform for startups and corporate labs including SRI International spin-outs and research teams at Google X.

Reception and Impact

PR2 was broadly recognized for catalyzing the modern open robotics ecosystem, accelerating adoption of the Robot Operating System across academia and industry, and lowering barriers to replicable research for institutions like ETH Zurich, University of Cambridge, and University of Oxford. Reviews in technical venues compared PR2 favorably to proprietary platforms from ABB and KUKA for research flexibility, while noting limitations such as cost and maintenance overhead relative to consumer-grade robots from companies like iRobot and Neato Robotics. PR2's influence persisted in curricula at institutions including Carnegie Mellon University and MIT, in robotics competitions inspired by RoboCup and DARPA Robotics Challenge, and in subsequent commercial platforms developed by entities like Fetch Robotics and Rethink Robotics. The legacy of PR2 includes contributions to open datasets, software packages, and methodological standards still referenced by researchers at Stanford University and UC Berkeley.

Category:Robots