This is a modified version of the erlerobot/robot_blockly repo. You can now control TurtleBot3 using Blockly - drag and drop software developed by Google.
mkdir -p ~/blockly_ws/src
cd ~/blockly_ws/src
git clone https://github.com/dabit-industries/turtlebot3_blockly
cd turtlebot3_blockly/frontend/
git submodule add https://github.com/dabit-industries/ace-builds.git ace-builds
git submodule init
git submodule update
git submodule add https://github.com/dabit-industries/blockly.git blockly
git submodule init
git submodule update
cd ~/blockly_ws/
catkin_make_isolated -j2 --pkg turtlebot3_blockly --install
or you may try this
mkdir -p ~/blockly_ws/src
cd ~/blockly_ws/src
git clone --recurse-submodules https://github.com/dabit-industries/turtlebot3_blockly
cd ~/blockly_ws
catkin_make_isolated -j2 --pkg turtlebot3_blockly --install
cd ~/blockly_ws
source devel_isolated/turtlebot3_blockly/setup.bash
roslaunch turtlebot3_blockly turtlebot3_blockly.launch