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<title>Drones to fight Corona | Clover</title><meta name="description" content="Clover Drone Kit">
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<div id="app"><!--[--><div class="theme-container"><!--[--><header ref_key="navbar" class="navbar"><div class="toggle-sidebar-button" title="true" aria-expanded="false" role="button" tabindex="0"><div class="icon" aria-hidden="true"><span></span><span></span><span></span></div></div><span><a href="/clover-vuepress/en/" class=""><img class="logo" src="/clover-vuepress/clover-logo.png" alt="Clover"><span class="site-name can-hide">Clover</span></a></span><div class="navbar-items-wrapper" style=""><!--[--><!--]--><nav class="navbar-items can-hide"><!--[--><div class="navbar-item"><a class="external-link" href="https://coex.tech" rel="noopener noreferrer" target="_blank" aria-label="Official Site"><!--[--><!--]--> Official Site <span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" 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aria-label="Safety tips"><!--[--><!--]--> Safety tips <!--[--><!--]--></a><!----></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Assembly <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/assembly.html" class="sidebar-item" aria-label="Clover drone assembly"><!--[--><!--]--> Clover drone assembly <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/assemble_4_2.html" class="sidebar-item" aria-label="Clover 4.2 assembly"><!--[--><!--]--> Clover 4.2 assembly <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/assemble_4_2_ws.html" class="sidebar-item" aria-label="Clover 4 assembly"><!--[--><!--]--> Clover 4 assembly <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/assemble_4.html" class="sidebar-item" aria-label="Clover 4 assembly"><!--[--><!--]--> Clover 4 assembly <!--[--><!--]--></a><!----></li><li><a 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class="sidebar-item" aria-label="RC setup"><!--[--><!--]--> RC setup <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/rc_flysky_a8s.html" class="sidebar-item" aria-label="Using Flysky FS-A8S"><!--[--><!--]--> Using Flysky FS-A8S <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/modes.html" class="sidebar-item" aria-label="Flight modes"><!--[--><!--]--> Flight modes <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/power.html" class="sidebar-item" aria-label="Power setup"><!--[--><!--]--> Power setup <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/failsafe.html" class="sidebar-item" aria-label="Failsafe configuration"><!--[--><!--]--> Failsafe configuration <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Manual flight <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/flight.html" class="sidebar-item" aria-label="Flight"><!--[--><!--]--> Flight <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/flight_exercises.html" class="sidebar-item" aria-label="Drone control exercises"><!--[--><!--]--> Drone control exercises <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Working with Raspberry Pi <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/raspberry.html" class="sidebar-item" aria-label="Raspberry Pi"><!--[--><!--]--> Raspberry Pi <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/image.html" class="sidebar-item" aria-label="Raspberry Pi image"><!--[--><!--]--> Raspberry Pi image <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/wifi.html" class="sidebar-item" aria-label="Connecting to Clover via Wi-Fi"><!--[--><!--]--> Connecting to Clover via Wi-Fi <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/connection.html" class="sidebar-item" aria-label="Connecting Raspberry Pi to the flight controller"><!--[--><!--]--> Connecting Raspberry Pi to the flight controller <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/gcs_bridge.html" class="sidebar-item" aria-label="Using QGroundControl via Wi-Fi"><!--[--><!--]--> Using QGroundControl via Wi-Fi <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/ssh.html" class="sidebar-item" aria-label="SSH access to Raspberry Pi"><!--[--><!--]--> SSH access to Raspberry Pi <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/cli.html" class="sidebar-item" aria-label="Command line interface"><!--[--><!--]--> Command line interface <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/selfcheck.html" class="sidebar-item" aria-label="Automatic check"><!--[--><!--]--> Automatic check <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/web_video_server.html" class="sidebar-item" aria-label="Viewing images from cameras"><!--[--><!--]--> Viewing images from cameras <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Programming <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/programming.html" class="sidebar-item" aria-label="Programming"><!--[--><!--]--> Programming <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/camera_setup.html" class="sidebar-item" aria-label="Camera setup"><!--[--><!--]--> Camera setup <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/aruco.html" class="sidebar-item" aria-label="ArUco markers"><!--[--><!--]--> ArUco markers <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/aruco_marker.html" class="sidebar-item" aria-label="ArUco marker detection"><!--[--><!--]--> ArUco marker detection <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/aruco_map.html" class="sidebar-item" aria-label="Map-based navigation with ArUco markers"><!--[--><!--]--> Map-based navigation with ArUco markers <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/optical_flow.html" class="sidebar-item" aria-label="Use of Optical Flow"><!--[--><!--]--> Use of Optical Flow <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simple_offboard.html" class="sidebar-item" aria-label="Autonomous flight"><!--[--><!--]--> Autonomous flight <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/frames.html" class="sidebar-item" aria-label="Coordinate systems (frames)"><!--[--><!--]--> Coordinate systems (frames) <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/snippets.html" class="sidebar-item" aria-label="Code examples"><!--[--><!--]--> Code examples <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/laser.html" class="sidebar-item" aria-label="Working with a laser rangefinder"><!--[--><!--]--> Working with a laser rangefinder <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/leds.html" class="sidebar-item" aria-label="Working with a LED strip"><!--[--><!--]--> Working with a LED strip <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/gpio.html" class="sidebar-item" aria-label="Working with GPIO"><!--[--><!--]--> Working with GPIO <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/sonar.html" class="sidebar-item" aria-label="Working with the ultrasonic distance gage"><!--[--><!--]--> Working with the ultrasonic distance gage <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/camera.html" class="sidebar-item" aria-label="Working with the camera"><!--[--><!--]--> Working with the camera <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/rviz.html" class="sidebar-item" aria-label="Using rviz and rqt"><!--[--><!--]--> Using rviz and rqt <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/autolaunch.html" class="sidebar-item" aria-label="Software autorun"><!--[--><!--]--> Software autorun <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/javascript.html" class="sidebar-item" aria-label="Work with ROS from browser"><!--[--><!--]--> Work with ROS from browser <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/blocks.html" class="sidebar-item" aria-label="Blocks programming for Clover"><!--[--><!--]--> Blocks programming for Clover <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simulation.html" class="sidebar-item" aria-label="Simulation overview"><!--[--><!--]--> Simulation overview <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simulation_native.html" class="sidebar-item" aria-label="Native setup"><!--[--><!--]--> Native setup <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simulation_vm.html" class="sidebar-item" aria-label="Simulation VM setup"><!--[--><!--]--> Simulation VM setup <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simulation_usage.html" class="sidebar-item" aria-label="Using the simulator"><!--[--><!--]--> Using the simulator <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/simulation_m1.html" class="sidebar-item" aria-label="Running simulator on M1 powered computer"><!--[--><!--]--> Running simulator on M1 powered computer <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/ros.html" class="sidebar-item" aria-label="ROS"><!--[--><!--]--> ROS <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/mavros.html" class="sidebar-item" aria-label="MAVROS"><!--[--><!--]--> MAVROS <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Supplementary materials <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/supplementary.html" class="sidebar-item" aria-label="Supplementary materials"><!--[--><!--]--> Supplementary materials <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/coex_pix.html" class="sidebar-item" aria-label="COEX Pix"><!--[--><!--]--> COEX Pix <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/coex_pdb.html" class="sidebar-item" aria-label="COEX PDB"><!--[--><!--]--> COEX PDB <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/coex_gps.html" class="sidebar-item" aria-label="COEX GPS"><!--[--><!--]--> COEX GPS <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/auto_setup.html" class="sidebar-item" aria-label="Step-by-step guide on autonomous flight with Clover 4"><!--[--><!--]--> Step-by-step guide on autonomous flight with Clover 4 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/hostname.html" class="sidebar-item" aria-label="Hostname"><!--[--><!--]--> Hostname <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/sitl.html" class="sidebar-item" aria-label="PX4 Simulation"><!--[--><!--]--> PX4 Simulation <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/wall_aruco.html" class="sidebar-item" aria-label="Navigation using vertical ArUco-markers"><!--[--><!--]--> Navigation using vertical ArUco-markers <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/calibratePID.html" class="sidebar-item" aria-label="Configuring the PID coefficients"><!--[--><!--]--> Configuring the PID coefficients <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/models.html" class="sidebar-item" aria-label="Model files for parts"><!--[--><!--]--> Model files for parts <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/ros-install.html" class="sidebar-item" aria-label="ROS Melodic package 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class="sidebar-item" aria-label="Controlling Clover from a smartphone"><!--[--><!--]--> Controlling Clover from a smartphone <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/network.html" class="sidebar-item" aria-label="Configuring Wi-Fi"><!--[--><!--]--> Configuring Wi-Fi <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/uart.html" class="sidebar-item" aria-label="UART interface"><!--[--><!--]--> UART interface <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/parameters.html" class="sidebar-item" aria-label="PX4 Parameters"><!--[--><!--]--> PX4 Parameters <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/flight_logs.html" class="sidebar-item" aria-label="PX4 Logs and Topics"><!--[--><!--]--> PX4 Logs and Topics <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/firmware.html" class="sidebar-item" aria-label="Pixhawk / Pixracer firmware flashing"><!--[--><!--]--> Pixhawk / Pixracer firmware flashing 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class="sidebar-item" aria-label="Connecting GPS"><!--[--><!--]--> Connecting GPS <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/ir_sensors.html" class="sidebar-item" aria-label="Working with IR sensors on Raspberry Pi 3"><!--[--><!--]--> Working with IR sensors on Raspberry Pi 3 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/fpv_clover_4_2.html" class="sidebar-item" aria-label="Installing and configuring FPV equipment"><!--[--><!--]--> Installing and configuring FPV equipment <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/fpv.html" class="sidebar-item" aria-label="Installation of FPV"><!--[--><!--]--> Installation of FPV <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/magnetic_grip.html" class="sidebar-item" aria-label="Assembling and setting up the electromagnetic gripper"><!--[--><!--]--> Assembling and setting up the electromagnetic gripper <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/mechanical_grip.html" class="sidebar-item" aria-label="Assembling and setting up a mechanical gripper"><!--[--><!--]--> Assembling and setting up a mechanical gripper <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/trainer_mode.html" class="sidebar-item" aria-label="FlySky Trainer mode settings"><!--[--><!--]--> FlySky Trainer mode settings <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/tinning.html" class="sidebar-item" aria-label="Blanching"><!--[--><!--]--> Blanching <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/connectortypes.html" class="sidebar-item" aria-label="Types of power connectors"><!--[--><!--]--> Types of power connectors <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/4in1.html" class="sidebar-item" aria-label="Connecting 4 in 1 ESCs"><!--[--><!--]--> Connecting 4 in 1 ESCs <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/tb.html" class="sidebar-item" aria-label="Soldering safety"><!--[--><!--]--> Soldering safety <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/leds_old.html" class="sidebar-item" aria-label="Working with a LED strip on Raspberry 3"><!--[--><!--]--> Working with a LED strip on Raspberry 3 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/contributing.html" class="sidebar-item" aria-label="Contribution to Clover"><!--[--><!--]--> Contribution to Clover <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/packages.html" class="sidebar-item" aria-label="COEX packages repository"><!--[--><!--]--> COEX packages repository <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/migrate20.html" class="sidebar-item" aria-label="Migration to version 0.20"><!--[--><!--]--> Migration to version 0.20 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/migrate22.html" class="sidebar-item" aria-label="Migration to version 0.22"><!--[--><!--]--> Migration to version 0.22 <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><li><p tabindex="0" class="sidebar-item sidebar-heading collapsible">Events <span class="right arrow"></span></p><!--[--><ul style="display:none;" class="sidebar-item-children"><!--[--><li><a href="/clover-vuepress/en/events.html" class="sidebar-item" aria-label="Events"><!--[--><!--]--> Events <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/copterhack2022.html" class="sidebar-item" aria-label="CopterHack 2022"><!--[--><!--]--> CopterHack 2022 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/copterhack2021.html" class="sidebar-item" aria-label="CopterHack 2021"><!--[--><!--]--> CopterHack 2021 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/copterhack2019.html" class="sidebar-item" aria-label="Copter Hack 2019"><!--[--><!--]--> Copter Hack 2019 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/copterhack2018.html" class="sidebar-item" aria-label="Copter Hack 2018"><!--[--><!--]--> Copter Hack 2018 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/copterhack2017.html" class="sidebar-item" aria-label="Copter Hack 2017"><!--[--><!--]--> Copter Hack 2017 <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/video_contest.html" class="sidebar-item" aria-label="Contest for the best educational video on assembly and configuration"><!--[--><!--]--> Contest for the best educational video on assembly and configuration <!--[--><!--]--></a><!----></li><li><a href="/clover-vuepress/en/educational_contests.html" class="sidebar-item" aria-label="Educational contests"><!--[--><!--]--> Educational contests <!--[--><!--]--></a><!----></li><!--]--></ul><!--]--></li><!--]--></ul><!--[--><!--]--></aside><!--]--><!--[--><main class="page"><!--[--><!--]--><div class="theme-default-content"><!--[--><h1 id="drones-to-fight-corona" tabindex="-1"><a class="header-anchor" href="#drones-to-fight-corona" aria-hidden="true">#</a> Drones to fight Corona</h1><p><a href="/clover-vuepress/en/copterhack2021.html" class="">CopterHack-2021</a></p><p>team: <strong>Drones to fight Corona</strong></p><h2 id="team" tabindex="-1"><a class="header-anchor" href="#team" aria-hidden="true">#</a> Team</h2><ul><li>Daria Miklashevskaya <a href="mailto:[email protected]">[email protected]</a></li><li>Yuriy Sukhorukov <a href="mailto:[email protected]">[email protected]</a></li></ul><p>Innopolis University, B17-DS-II, B17-RO-I</p><h2 id="introduction" tabindex="-1"><a class="header-anchor" href="#introduction" aria-hidden="true">#</a> Introduction</h2><p>The world faces the worst pandemic of XXI century, which affects lives and well-being of millions of citizens. To slow down the spread of the disease and give the healthcare system to react, people are obliged to wear masks, however, people sometimes ignore those rules, which puts lives of others under the threat.</p><p>There are laws in place to enforce mask wearing, but there is just not enough cops to monitor the situation in every mall, bus station etc and fine the law-breakers. We want to contribute to the solution of this problem, but instead of punishing people, we want to provide them with mask with our super-friendly and cute drone.</p><h2 id="custom-airframe" tabindex="-1"><a class="header-anchor" href="#custom-airframe" aria-hidden="true">#</a> Custom airframe</h2><p>Since we do not have the Clover drone, we will use an airframe built and designed by us. Our system is designed to be platform-independent, so it can be installed on almost everything, even VTOL aircrafts.</p><p>The main idea is to use truss structure, because it works well against twisting and warping, besides, it can be assembled out of carbon tubes relatively easily.</p><img src="/clover-vuepress/assets/drone_frame.260084a3.jpg" title="Frame"><p>The main advantage of such a system is that it distributes the impact between beams and effectively dissipates it. Engine mounts, however, are not impact-proof because they are specifically designed to break but save much more expensive and not-readily-available engines. This is why mounts are quickly-replaceable (only 3 screws) and made of cheap PLA plastic.</p><p>The space inside the central rhombus is occupied by the on-board equipment: batteries, PX4 flight controller, Jetson Xavier NX / AGX, power electronics, sensory equipment.</p><p>As it is shown on this picture, computers can be mounted on the bottom and completely protected by legs and the truss structure from any collision damage. Jetson AGX is marked with arrow. Almost invisible, isn't it?</p><img src="/clover-vuepress/assets/drone_with_jetson.a3c96cc9.jpg" title="AGX is safe"><p>All sensory equipment, like cameras, rangefinder, etc can be easily mounted on the beams with special bracket connectors. This type of connection provides flexibility because you can fine-tune camera angle or position before tightening screws and fixing it firmly in place, which is especially relevant for tracker-cameras.</p><p>We used one T-265 camera for visual odometry and one D-435 depth camera for both video input for neural net and for map-building (collision avoidance). T-265 suffers from "odometry drift" especially when engines are beat-up, which eventually happens after a number of crashes, so we have incorporated dampers to solve this problem.</p><img src="/clover-vuepress/assets/camera.e1f6c1b1.jpg" title="Begone odometry drift" width="400" class="zoom center"><p>Finally, the drone with all equipment installed looks like this</p><img src="/clover-vuepress/assets/drone_assembled.bfb15b9c.jpg" title="Assembled drone" width="400" class="zoom center"><h2 id="software" tabindex="-1"><a class="header-anchor" href="#software" aria-hidden="true">#</a> Software</h2><p>Thus far we discussed things which are specific to our custom airframe. Things we are going to discuss next are applicable for Clover drone as well. Our software is containerized so it can be launched on every platform that supports Docker, be it Windows machine, Linux machine, Jetson or Raspberry Pi.</p><p>We have split our drone software into two modules:</p><ul><li>Pipeline, which manages communication with ROS.</li><li>Neural net module, which talks with the pipeline via sockets.</li></ul><p>The reason for this is simple - ROS supports only Python 2, and I do not feel like I'm building ROS with Python 3 because it is a bit troublesome. Our neural net, on the other hand, uses Pytorch which is Python 3 only, so the only way to run them both is to use inter-process communication of some sort.</p><p>Apart from compatibility issue, such an arrangement allows us to run inference module anywhere we want, e.g. on more powerful desktop PC or even somewhere in the cloud (google collab? Why not!).</p><p>This means that we can make our drone lighter by excluding heavy on-board computer and replacing it with something light like Raspberry Pi. Pipeline image is made as lightweight as possible, so it should be runnable even on really weak computers.</p><p>More detailed instructions on how to build and run our software are available in our <a href="https://gitlab.com/k0t1k/thegreateye/-/tree/master" target="_blank" rel="noopener noreferrer">Gitlab repo<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>.</p><h2 id="neural-net-1" tabindex="-1"><a class="header-anchor" href="#neural-net-1" aria-hidden="true">#</a> Neural net [^1]</h2><p>We use 3rd version of YoLo neural network, pretrained on custom dataset for 50 epochs.</p><p>It runs 10-15 FPS on Jetson NX, which is enough for our task</p><h2 id="exploration-and-collision-avoidance" tabindex="-1"><a class="header-anchor" href="#exploration-and-collision-avoidance" aria-hidden="true">#</a> Exploration and collision avoidance</h2><p>To make our drone useful and to operate it safely, we should somehow make the drone aware of its current position and surrounding objects. There are two ways we can solve this problem</p><ul><li>Use pre-built map as a ground truth and then calculate the position with e.g. Particle Filter</li><li>Build map on-the-fly, while avoiding collisions and moving towards the goal</li></ul><p>The second approach is more robust, because it does not rely on any external map, which can be erroneous or just missing and hence we opted for it.</p><p>We use a path planner, described in [^2]. In this paper Receding Horizon Next-Best-View Planner is presented, which uses Rapidly-exploring Random trees to navigate and explore the environment. It yields the following results, here is the occupancy map and the corresponding tunnel as it is seen by human being:</p><div class="image-group"><img src="/clover-vuepress/assets/robot_view.4125e969.jpg" title="Mask release manufactured" width="300" class="zoom center"><img src="/clover-vuepress/assets/human_view.45a12833.jpg" title="Mask release in cad" width="300" class="zoom center"></div><p>The algorithm is lightweight, so even the small computer like Latte Panda can run it with high enough frequency, and since it is CPU-bound, it will not compete for resources with the neural net, which is almost entirely GPU-bound.</p><h2 id="mask-release" tabindex="-1"><a class="header-anchor" href="#mask-release" aria-hidden="true">#</a> Mask release</h2><p>Detecting people without masks is cool, no doubt.</p><img src="/clover-vuepress/assets/masks.2913551e.jpg" title="Master and his apprentice" width="400" class="zoom center"><p>But we want not only to detect them but to give him a mask as well, so, we have built this system that can give a mask to person.</p><div class="image-group"><img src="/clover-vuepress/assets/release.28c09295.jpg" title="Mask release in cad" width="300" class="zoom center"><img src="/clover-vuepress/assets/release_Cad.34c90e52.jpg" title="Mask release manufactured" width="300" class="zoom center"></div><p>This device looks like a regular firearm mag, and functions exactly in the same way. Masks can be loaded into containers made out of 20ml syringe barrels.</p><p>This device needs further engineering because current iterations are too fragile and unreliable, probably the best solution will be to use linear actuator and push the "casing" out of the action, like in actual firearm.</p><h2 id="_3d-models" tabindex="-1"><a class="header-anchor" href="#_3d-models" aria-hidden="true">#</a> 3D models</h2><p>All the 3D models used to build this cute drone can be found in our <a href="https://drive.google.com/drive/folders/1tR5ePX24_i9tpllOPMcnZIUfse89c1YI?usp=sharing" target="_blank" rel="noopener noreferrer">gdrive<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a>.</p><h2 id="final-thoughts" tabindex="-1"><a class="header-anchor" href="#final-thoughts" aria-hidden="true">#</a> Final thoughts</h2><p>We all hope that Corona crisis will soon be over, and when it will be finally over, our drones will be still useful. We can deliver some small objects, like cosmetics or shaving blades to the customers' door, the task that currently is done by a human courier. This service (with shaving blades), when a guy comes and brings a new set of shaving blades every week is very popular in US and UK, so why not try to automate it.</p><p>This is an MVP, so some improvements are to be done. For example, payload refill and battery swaps are done manually for now, but this task should be automated. Actually, some work is already done in this direction:</p><img src="/clover-vuepress/assets/charging_drone.fb245286.jpg" title="Mask release manufactured" width="300" class="zoom center"><p>Drone lands on a landing platform with special hooks which will connect to four metallic contacts (highlighted) and charge the battery. In future we want to change battery, not just charge it, but the mechanism is very complex and requires making custom batteries and battery mounts, also, it constraints placement of cameras, payload and so on.</p><p>For the general-purpose delivery drone, the working principle and hardware will remain the same, but software (neural net detector) will need an update.</p><p>Stay safe folks!</p><h2 id="references" tabindex="-1"><a class="header-anchor" href="#references" aria-hidden="true">#</a> References</h2><p>[^1]: Massagué Respall, Victor & Devitt, Dmitry & Fedorenko, Roman. (2020). Unmanned Aerial Vehicle Path Planning for Exploration Mapping. 1-6. 10.1109/NIR50484.2020.9290232. [^2]: Nisarg Pethani & Harshal Vora. (2020) <a href="https://github.com/NisargPethani/Face-Mask-Detection-using-YOLO-v3" target="_blank" rel="noopener noreferrer">https://github.com/NisargPethani/Face-Mask-Detection-using-YOLO-v3<span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span></a></p><!--]--></div><footer class="page-meta"><div class="meta-item edit-link"><a class="external-link meta-item-label" href="https://github.com/CopterExpress/clover/edit/master/docs/en/anticorona_drones.md" rel="noopener noreferrer" target="_blank" aria-label="Edit this page"><!--[--><!--]--> Edit this page <span><svg class="external-link-icon" xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewbox="0 0 100 100" width="15" height="15"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path><polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg><span class="external-link-icon-sr-only">open in new window</span></span><!--[--><!--]--></a></div><!----><!----></footer><!----><!--[--><!--]--></main><!--]--></div><!----><!--]--></div>
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