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ros-robotic-arm

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# ros-robotic-arm

This package is meant to help me understand how to use [MoveIt!](https://moveit.ros.org/) to control a robotic arm inside Gazebo.

## Prerequsities

To use this package you need to instal 
- [ROS](http://www.ros.org/) 
- [Gazebo](http://gazebosim.org/) and 
- [MoveIt!](https://moveit.ros.org/) framework.

## Robotic arm description

This package contains a simple robotic arm consisting of two arms and a end effector link as can be seen on the picture bellow.

![future robotic arm](https://raw.githubusercontent.com/kkumpa/ros-robotic-arm/master/doc/img/arm.png)

The MoveIt! planning is now using a IKFast plugin of type TranslationDirection5D generated by following [this tutorial](http://docs.ros.org/indigo/api/moveit_tutorials/html/doc/pr2_tutorials/kinematics/src/doc/kinematics_configuration.html). It makes the planning faster. The solver can be changed in `robotic_arm_moveit_config/config/kinematics.yaml` file. (change this line: `kinematics_solver: robotic_arm_arm_kinematics/IKFastKinematicsPlugin` for a solver of your choosing. For example `kinematics_solver: kdl_kinematics_plugin/KDLKinematicsPlugin`)

## Current State

### Control with Rviz
You can start the robotic arm in Gazebo using command.

roslaunch robotic_arm_gazebo empty_world.launch 
  
You can run rviz and see planned trajectories between different positions of the robotic arm using command

roslaunch robotic_arm_moveit_config moveit_planning_execution.launch

and adding the MotionPlanning display to the rviz inside the GUI.

You can set the starting and end positions and then click the 'plan and execute button' and the robotic arm will move to the end position both in Rviz and in the Gazebo.

### Control with Servis

You can set the individual joint position by calling a service.

Launch Gazebo:

roslaunch robotic_arm_gazebo empty_world.launch

Launch MoveIt!:

roslaunch robotic_arm_algorithm move.launch

Run service:

rosrun robotic_arm_algorithms set_joint_states_service.py

Set joint states:

rosrun robotic_arm_algorithms set_joint_states_client.py <base_forearm_joint_angle> <forearm_0_1_joint_angle> <forearm_arm_joint_angle> <arm_0_1_joint_angle>

|joint                        |range              |
|:---------------------------:|:-----------------:|
|`<base_forearm_joint_angle>` | [-3e+307, 3e+307] |
|`<forearm_0_1_joint_angle>`  | [-1.4, 1.4]       |
|`<forearm_arm_joint_angle>`  | [-3e+307, 3e+307] |
|`<arm_0_1_joint_angle>`      | [-1.4, 1.4]       |

ros-robotic-arm

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