Install dependencies:
$ sudo apt install ros-melodic-moveit ros-melodic-pcl-ros
$ mkdir -p ~/widowx_arm/src
$ cd ~/widowx_arm/src
$ git clone https://github.com/ripdk12/widowx_arm.git
$ git clone https://github.com/ripdk12/arbotix_ros.git -b parallel_gripper
$ cd ~/widowx_arm
$ catkin_make
$ source devel/setup.bash
$ roslaunch widowx_arm_bringup arm_moveit.launch sr300:=false
$ source devel/setup.bash
$ roslaunch widowx_arm_bringup arm_moveit.launch sim:=false sr300:=false
you might need to give permission to access ttyUSB0:
$ sudo chmod 777 /dev/ttyUSB0
$ roslaunch widowx_arm_bringup arm_moveit.launch sim:=false sr300:=true
$ roslaunch widowx_block_manipulation block_sorting_demo.launch