Visual Lander

The goal of this exercise is to implement the logic that allows a quadrotor to visualize a beacon and land on it.

Visual Lander.
Gallery.

Installation

Install the General Infrastructure of the JdeRobot Robotics Academy.

As this is a drones exercise, you will need to additionally install the jderobot-assets, dronewrapper, rqt_drone_teleop and rqt_ground_robot_teleop packages. These can be installed as

sudo apt-get install ros-melodic-jderobot-drones ros-melodic-jderobot-assets

There is an additional dependency on MAVROS and PX4 that you can fulfill following the Drones installation instructions.

How to run

To launch the exercise, simply use the following command from this directory:

roslaunch follow_road.launch

How to do the practice

To solve the exercise, you must edit the my_solution.py file and insert the control logic into it.

Where to insert the code

Your code has to be entered in the execute function between the Insert your code here comments.

my_solution.py

def execute(event):
  global drone
  img_frontal = drone.get_frontal_image()
  img_ventral = drone.get_ventral_image()
  # Both the above images are cv2 images
  ################# Insert your code here #################################

  set_image_filtered(img_frontal)
  set_image_threshed(img_ventral)

  #########################################################################

API

  • set_image_filtered(cv2_image) - If you want to show a filtered image of the camera images in the GUI
  • set_image_threshed(cv2_image) - If you want to show a thresholded image in the GUI
  • drone.get_frontal_image() - Returns the latest image from the frontal camera as a cv2_image
  • drone.get_ventral_image() - Returns the latest image from the ventral camera as a cv2_image
  • drone.get_position() - Returns the position of the drone as a numpy array [x, y, z]
  • drone.get_orientation() - Returns the roll, pitch and yaw of the drone as a numpy array [roll, pitch, yaw]
  • drone.get_roll() - Returns the roll of the drone
  • drone.get_pitch() - Returns the pitch of the drone
  • drone.get_yaw() - Returns the yaw of the drone
  • drone.set_cmd_vel(vx, vy, vz, az) - Commands the linear velocity of the drone in the x, y and z directions and the angular velocity in z in its body fixed frame

Theory

Comming soon.

Hints

Simple hints provided to help you solve the visual_lander exercise. Please note that the full solution has not been provided.

Comming soon.


Contributors