INTRODUCTION
Welcome to the official developer documentation for ADIR BASIC, the differential drive robot designed for versatile indoor/ outdoor navigation. This chapter provides instructions on how to get ADIR up and running on your system.
REPOSITORY
The official repository can be found here: https://github.com/AntRobotics-de/adir
PREREQUISITES
- A computer running a Debian-based Linux distribution (currently Ubuntu 22.04).
- ROS2 Humble installed
ELECTRICAL INTEGRATION
CAN Connectivity Interface
Size 12 - 8 pin Quicklock Connector: https://www.lutronic.biz/en/connectivity/product/2350+...+T06CB+T
| Pin | Function |
|---|---|
| 1 | GND |
| 2 | CAN_L |
| 3 | 5V |
| 4 | External Emergency Switch |
| 5 | Digital Input |
| 6 | Digital Input |
| 7 | CAN_H |
| 8 | Digital Output |
Joystick Interface
Size 12 - 5 pin Quicklock Connector: https://www.lutronic.biz/en/connectivity/product/2350+...+T06CB+T
| Pin | Function |
|---|---|
| 1 | GND |
| 2 | 5V |
| 3 | Joystick Button (pressed 5V) |
| 4 | Joystick Input 1 (Analog 0-5V) |
| 5 | Joystick Input 2 (Analog 0-5V) |
Digital and Analog Inputs
Digital and Analog Inputs can be retrieved using the CAN BUS. The Digital Output can be set via CAN BUS:
| Parameter | Measure Point | Min. | Typical | Max. | Unit |
|---|---|---|---|---|---|
| 5V Output Current | - | - | - | 100 | mA |
| Digital Output Voltage | Ground to Output pin | - | - | 30 | Volts |
| Digital Output Current | Output pin, sink current | - | - | 1 | Amps |
| Digital Input 0 Level | Ground to Input pin | -1 | - | 1 | Volts |
| Digital Input 1 Level | Ground to Input pin | 3 | - | 30 | Volts |
| Analog Input Range | Ground to Input pin | 0 | - | 5.1 | Volts |
SOFTWARE INSTALLATION
Environment Setup
If you are using CAN by connecting to the given port on ADIR and CAN bus is up & running, then we can skip this step.
If using USB cable, please download the adir.sh bash script first and run it using the following commands:
chmod +x adir.sh sudo ./adir.sh
Once succesfully run, then we can launch the run files. Please note that the can bit rate is currently set to 500000.
Installing Dependencies
To use Adir, you must first install the necessary Debian packages. These packages contain all the dependencies and drivers required for Adir to operate seamlessly. The packages can latter be downloaded using rosdep. In order for rosdep to find the packages, we need to add the Antrobotics repository and the rosdep definitions for the packages.
Adding apt repository
curl -s --compressed "https://antrobotics-de.github.io/ppa/KEY.gpg" | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/antrobotics_ppa.gpg >/dev/null sudo curl -s --compressed -o /etc/apt/sources.list.d/antrobotics.list "https://antrobotics-de.github.io/ppa/antrobotics.list" sudo apt update
Adding rosdep definition
echo "yaml https://antrobotics-de.github.io/ppa/rosdep/antrobotics.yaml" | sudo tee /etc/ros/rosdep/sources.list.d/antrobotics.list >/dev/null rosdep update
Cloning the repository
mkdir -p adir_ws/src cd adir_ws/src git clone -b ros2-humble https://github.com/AntRobotics-de/adir.git cd .. rosdep install --from-paths src --ignore-src -r -y colcon build --symlink-install
Launching ADIR
To start using ADIR, you can use the following command:
ros2 launch odometry odometry.launch.py
To start moving it, we can publish forward and angular velocities from the terminal or scripts on ros2 topic ' /cmd_vel '
ADDITIONAL INFORMATION
Topics
Below is a list of the topics used in this project along with their respective message types and descriptions.
| Topic Name (Publishers) | Message Type | Description |
|---|---|---|
| /odom | nav_msgs/Odometry | Publishes the adir odometry information(currently only using wheel encoders) |
| /motor_controller/voltage | std_msgs/Float | Publishes robot voltage. Please charge when it falls below 23V |
| /motor_controller/status | ros_can_interfaces/Frame | Publishes information on serial,pulse or analog mode and stall detection |
| /motor_controller/fault_state | ros_can_interfaces/Frame | Publishes information on overheating, undervoltage, overvoltage, shortcircuit, emergency stop, motor sensor setup fault & mosfet failure |
| /motor_controller/motor*/runtimestatus | ros_can_interfaces/Frame | Publishes information on amps limit active, motor stall. loop error detection, safety stop active, forward limit triggered, reverse limit triggered & amps trigger activated |
| Topic Name (Subscribers) | Message Type | Description |
|---|---|---|
| /cmd_vel | geometry_msgs/Twist | Subscribes to velocity commands for the robot |
Services
| Service Name | Service Type | Description |
|---|---|---|
| /ResetOdometry | std_srvs/Trigger | Resets the adir wheel odometry |