# Raspberry Pi - ROS installation

This is a guide on how to install ROS-indigo on a Raspberry Pi 2 serving as a companion computer for Pixhawk.

# Prerequisites

# Installation

Follow this guide (opens new window) for the actual installation of ROS Indigo. Note: Install the "ROS-Comm" variant. The Desktop variant is too heavyweight.

# Errors when installing packages

If you want to download packages (e.g. sudo apt-get install ros-indigo-ros-tutorials), you might get an error saying: "unable to locate package ros-indigo-ros-tutorials".

If so, proceed as follows: Go to your catkin workspace (e.g. ~/ros_catkin_ws) and change the name of the packages.

$ cd ~/ros_catkin_ws
$ rosinstall_generator ros_tutorials --rosdistro indigo --deps --wet-only --exclude roslisp --tar > indigo-custom_ros.rosinstall

Next, update your workspace with wstool.

$ wstool merge -t src indigo-custom_ros.rosinstall
$ wstool update -t src

Next (still in your workspace folder), source and make your files.

$ source /opt/ros/indigo/setup.bash
$ source devel/setup.bash
$ catkin_make