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Image of the project Triskar2
Short Description: Highly modular omnidirectional robot base
Coordinator: AndreaBonarini (
Collaborator: GiulioFontana (, MartinoMigliavacca (
Research Area: Robotics
Research Topic: Robot development
Start: 2012/10/01
End: 2015/12/31
Status: Active

General features

Triskar2 is a highly modular, omnidirectional base, developed after some years of experience with omnidirectional robots Triskar developed for the Milan Robocup Team playing in the Robocup competition up to 2010.

The Triskar2 base from the bottom, with PC support.

Triskar2 is modular from the mechanical, the electronic, and the SW points of view.

Any mechanical dimension can be changed within hours. Each arm holding the motor is independent and can be locked on the central pillar in seconds. This also allows easy transportation. On the central pillar different "bodies" can be locked.

The electronics of Triskar2 is based on R2P, which allows easy and quick modifications.

Triskar2 is currently under development as a base for some Robogames, the most advanced of which is presently Alien-Bot.


Mechanics. The frame of the robot is based on Item modular products. Motor and transmission subsystems have been designed to minimize the number of mechanical elements that have to be especially built or customized for this application, thus reducing the time, tooling and skills required for modification, repair or construction.

Triskar2 uses three identical motor+transmission modules, each comprising the following elements:

  • a [Maxon] motor+encoder+transmission combination (code #220251) (composed of: #118798 DC motor mod. RE36, graphite brushes, 70W, ball bearings, 2 shafts); #166158 2-stage planetary gearhead, 2.25Nm, ball bearings; #110513 tacho encoder 500 impulses/turn)

Electronics. Electronic elements (e.g., motor control) of Triskar2 are based R2P, the modular robot architecture developed at AIRLab by Martino Migliavacca. Independent, low-cost, HW modules implement the single functionalities (motor control, communication, sensor interfaces, ...) and it is connected to the others via a CAN bus, participating in a publish-subscribe architecture supported by the real-time operating system ChiBiOS. This means that interaction among modules is implemented in real-time. Modules include an ST Microelectronics ARM processor on which the basic functionalities of the module are implemented. Therefore, any robot HW can be implemented in hours.

R2P exposes a [MicroROS] interface, enabling each R2P node to interact directly to any ROS node implemented on a connected computer or network.

On the first instance of Triskar2 a PC by Zotac is mounted, powered through the DCDC by Mini-box.