Franka-Interface

This is a software package used for controlling and learning skills on the Franka Emika Panda Research Robot Arm.

Installation Instructions and Robot Setup Instructions are also available here: https://iamlab-cmu.github.io/franka-interface

To join the Discord community, click the link here.

Requirements

• A computer with the Ubuntu 18.04 Realtime Kernel and at least 1 ethernet port.
• ROS Kinetic / Melodic
• Protocol Buffers

Computer Setup Instructions

This library is intended to be installed on the computer that interfaces with the Franka (we call this the Control PC). To use this library, refer to FrankaPy, which can be run on any computer on the same ROS network and sends commands to franka-interface.

1. The Control PC should have an OS with real time kernel. The instructions for setting up a computer with the 18.04 Realtime Kernel from scratch are located here: control pc ubuntu setup guide
2. Instructions for setting up the computer specifically for Franka Robots is located here: franka control pc setup guide

Install ProtoBuf

We use both C++ and Python versions of protobufs so you would need to install Protobufs from source.

Do nproc to find out how many cores you have, and use that as the N number in the make command below:

sudo apt-get install autoconf automake libtool curl make g++ unzip
wget https://github.com/protocolbuffers/protobuf/releases/download/v3.11.4/protobuf-all-3.11.4.zip
unzip protobuf-all-3.11.4.zip
cd protobuf-3.11.4
./configure
make -jN
make check -jN
sudo make install
sudo ldconfig

See detailed instructions here

Installation

1. Clone Repo and its Submodules:

   git clone --recurse-submodules [email protected]:iamlab-cmu/franka-interface.git   
   cd franka-interface

All directories below are given relative to /franka-interface.

2. Clone LibFranka corresponding to your robot version. For example if your firmware is 3.x use the following command:

   bash ./bash_scripts/clone_libfranka.sh 3

3. Build LibFranka

   bash ./bash_scripts/make_libfranka.sh

4. Build franka-interface

   bash ./bash_scripts/make_franka_interface.sh

   Once it has finished building, you should see an application named franka_interface in the build folder.

5. Build ROS Node franka_ros_interface

   Make sure that you have installed ROS Kinetic / Melodic already and have added the source /opt/ros/kinetic/setup.bash or source /opt/ros/melodic/setup.bash into your ~/.bashrc file. Make sure you have also installed catkin-tools either globally or in a virtual environment using the command pip install catkin-tools.

   bash ./bash_scripts/make_catkin.sh

6. To allow asynchronous gripper commands, we use the franka_ros package, so install libfranka and franka_ros using the following command (Change melodic to kinetic if you are on Ubuntu 16.04:

   sudo apt install ros-melodic-libfranka ros-melodic-franka-ros

Citation

If this library proves useful to your research, please cite the paper below::

@article{zhang2020modular,
title={A modular robotic arm control stack for research: Franka-interface and frankapy},
author={Zhang, Kevin and Sharma, Mohit and Liang, Jacky and Kroemer, Oliver},
journal={arXiv preprint arXiv:2011.02398},
year={2020}
}

Issues

LibPoco issue

libFranka requires libPoco, which can be installed using sudo apt-get install libpoco-doc libpoco-dev. However, trying to build libFranka might still fail since CMAKE cannot run find_package(Poco) since there doesn't exist /usr/local/lib/cmake/Poco/PocoConfig.cmake. This is a peculiarity of libPoco which installs in a weird way without providing an option for us to link against it.

To fix this we have copied the libPoco.cmake file in {franka-interface-dir}/cmake, and we add the following line to the CMakeLists.txt

list(INSERT CMAKE_MODULE_PATH 0 ${CMAKE_SOURCE_DIR}/cmake

Do the following if you run run into libfranka: Cannot load model library: Cannot load library:

mkdir -p /usr/local/lib/cmake/Poco/
cp cmake/FindPoco.cmake /usr/local/lib/cmake/FindPoco.cmake