Nindamani the Weed Removal Robot

Nindamani - The Weed Removal Robot

Nindamani, the AI based mechanically weed removal robot, which autonomously detects and segment the weeds from crop using artificial intelligence. The whole robot modules natively build on ROS2. Nindamani can be used in any early stage of crops for autonomous weeding.

Demo Video:

Objective: To develop an autonomous weed removal robot which will mitigate the problem of excessive herbicides, harmful chemical usage and to overcome labour shortage problem in farm field.

Vision: To accomplish herbicides free agriculture farming and improve the farmer’s yield.

In this following repository, you will find instructions for software installation and control mechanism for Nindamani robot.

Features:

• Fully ROS2 compatible
• Battery Operated
• Runtime upto 8-10 hours
• Robotics Arm based weed removal
• Weed detection accuracy upto 85%
• Easy to Operate

In this section we will install all the necessary dependencies in order to be able to launch nindamani robot:

Packages

nindamani_agri_robot - integrate all launch node of nindamani robotrpicam_ai_interface - controlling the rpi camera with AI interfaceservo_control - controlling the servo motors with ROS2 interfacestepper_control - controlling the multiple stepper motors with ROS2 interface

Installation on Jetson Nano Dev Kit

1. NVIDIA Jetpack SDK

• Download latest SDK image: https://developer.nvidia.com/embedded/jetpack
• Completely Format SD card (should not contain any partition). Use Ubuntu default app Disks [Recommeded 64GB SD card]
• Copy ZIP(jetpack image) file to SD card: https://developer.nvidia.com/embedded/learn/get-started-jetson-nano-devkit#write

2. Prerequisites and Dependencies for TensorFlow

Install Keras: sudo pip3 install keras

• Follow this instructions [official from NVIDIA]: https://docs.nvidia.com/deeplearning/frameworks/install-tf-jetson-platform/index.html#prereqs

3. ROS2 (Dashing Diademata)

Make sure that you have colcon in your machine if you are installing from Debian packages. sudo apt install python3-colcon-common-extensionsFor adding additional packages use: sudo apt install ros-$ROS_DISTRO-<package-name>

• Install ROS2 base: https://index.ros.org/doc/ros2/Installation/Dashing/Linux-Install-Debians/

4. Arduino

To get Temporary access to USB: sudo chown <user-name> /dev/tty<usb> and sudo chmod a+rw /dev/tty<usb>Clone this repo: https://github.com/AutoRoboCulture/Arduino-Jetson-nano-interface.git

• Follow this repo to install Arduino on Jetson nano: https://github.com/JetsonHacksNano/installArduinoIDE.git
• To set Permenantly change USB device permission: http://ask.xmodulo.com/change-usb-device-permission-linux.html
• To control arduino from Command line Source:https://github.com/arduino/arduino-cli
• Place this repo in Arduino Folder

5. OpenCV 3.4.4

• Refer link: https://www.pyimagesearch.com/2018/05/28/ubuntu-18-04-how-to-install-opencv/

6. Wifi

• To setup default wifi connection(Intel 8265 NGW card) while bootup Source: https://desertbot.io/blog/how-to-add-a-dual-wifi-bluetooth-card-to-a-jetson-nano-intel-8265

Create ROS2 Workspace

• follow this steps:

mkdir -p ~/nindamani_ws/src
cd ~/ros2_mara_ws
colcon build
cd src
git clone https://github.com/AutoRoboCulture/nindamani-the-weed-removal-robot.git

Clone the Mask R-CNN GitHub Repository:

1. Code: git clone https://github.com/matterport/Mask_RCNN.git

2. Copy this cloned repo to rpicam_ai_interface package: cp Mask_RCNN rpicam_ai_interface/.

3. Run command:

cd rpicam_ai_interface/Mask_RCNN

sudo python3 install setup.py

4. Confirm the Library Was Installed: pip3 show mask-rcnn

Download preTrained Model weights

• Link for MASK-RCNN preTrained model
• Copy preTrained weights to rpicam_ai_interface package:

mkdir rpicam_ai_interface/preTrained_weights
cp mask_rcnn_trained_weed_model.h5 rpicam_ai_interface/preTrained_weights/.

Follow Folder Structure:

nindamani_ws
├── build
├── install
├── log
└── src
├── nindamani_agri_robot
│   ├── launch
│   └── scripts
├── rpicam_ai_interface
│   ├── scripts
│   ├── preTrained_weights
│   └── Mask-RCNN
├── servo_control
│   ├── config
│   ├── scripts
│   └── srv
└── stepper_control
├── config
├── scripts
├── src
└── srv

Compile nindamani_ws

• Follow steps:

cd nindamani_ws
colcon build

Dependency

Stepper Motor library implementation on Arduino

Launch nindamani robot

• Make sure source setup.bash in bashrc before ROS2 launch command: echo "source /home/<user-name>/nindamani_ws/install/setup.bash" >> ~/.bashrc
• ROS2 Launch command: ros2 launch nindamani_agri_robot nindamani_agri_robot.launch.py

Potential Improvements

We have presented the concept that how weeds can be detected from crops using Artifical Intelligence and through delta arm robot weeds are removed autonomously. It's not perfect of course as you can see in the video link but can be improved. Here are some of our ideas which can improvise this robot in future:

• Gripper design enchancement with end tip as arrow shaped.
• Delta arm reach can be improved with high torque stepper motor.
• With RTK-GPS and 4 wheeled drive + 4 wheel steering implementation on robot, it will make whole robot working autonomously.
• Need 3D mapping of land using Lidar, for finding variations in height of crops, weeds and ridge.

References

• Mask R-CNN for Object Detection and Segmentation

@misc{matterport_maskrcnn_2017,
title={Mask R-CNN for object detection and instance segmentation on Keras and TensorFlow},
author={Waleed Abdulla},
year={2017},
publisher={Github},
journal={GitHub repository},
howpublished={\url{https://github.com/matterport/Mask_RCNN}},
}

• Train Mask-RCNN model on Custom Dataset for Multiple Objects
• Delta Robot Simulation on Gazebo using MARA-Env

Developer's Contact Detail

Kevin Patel
Nihar Chaniyara
Email: autoroboculture@gmail.com