Questions tagged [python]

Python is a widely used high-level, general-purpose, interpreted, dynamic programming language.

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Write appropriate ROS/Python​ that continuously orientates a turtlebot to Polaris (the north star) from anywhere on Earth? [closed]

I have been given this question as an assignment. I want to understand the approach to solve this problem. Is this problem based on perception and navigation? thanks
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2answers
378 views

ROS TURTLESIM using PYTHON

In ROS TURTLESIM, While moving the turtle in circle using the linear velocity and angular velocity , how do i track the distance so as to stop the turtle moving after one revolution ??
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4answers
107 views

Best microcontroller for develop a robot for the market

I am planning to produce and release a robot to the market and also worked with different platforms for development such as arduino,pic,micropython/python. But now I want to do this professional. I ...
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1answer
52 views

Res-Scaling method beats PID controller. How?

Scenario: I have a robotic arm that has a (1D) lidar on its end, to orient itself with respect to the slant table in front of it. The lidar returns pretty accurate distance values in mm. The motor ...
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1answer
33 views

Are there any tutorials for OMPL in Python?

I want to learn and understand the Open Motion Planning Library (OMPL) through Python as I don't have much experience with C++. Almost all tutorials are written in C++ and there are some demos in ...
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1answer
64 views

2D Visual-Inertial Extended Kalman Filter

I am trying to implement an Extended Kalman filtering for combining IMU data and visual odometry in a simple 2D case where I have a robot that that can only accelerate in its local forward direction ...
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0answers
38 views

ModuleNotFoundError: No module named 'second.core.non_max_suppression.nms'

I am using Anaconda base environment for second.pytorch of ubuntu 16.04 after executing the following: nvidia-docker run -it --rm -v /media/yy/960evo/datasets/:/root/data -v $HOME/pretrained_models:/...
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1answer
31 views

ROS2 and TypeError when publishing custom message to Topic

I have defined a custom message: uint8[] data The custom message is imported in my Node class with no problems: ...
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2answers
58 views

OpenCV4.2 and Ubuntu16.04 with python2.7?

Summary: I'm using new vision of opencv, opencv 4.2 with ubuntu 16.04 and python 2.7 After built cv_bridge, the output is: ...
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1answer
28 views

Simulating sensor readings based on an existing Alan Variance Analysis

My goal is to model an accelerometer and a gyroscope based on real hardware. I understand deterministic errors like bias and scaling but the different types of non-deterministic errors are difficult. ...
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1answer
50 views

How to find visual odometry by video from cellphone camera mounted on robot?

I am writing codes in python for visual odometry from single camera. I used cell phone camera for testing. I took video of 35 sec with camera moving. I used code below to read first image ...
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0answers
55 views

Applying initial guessing to LiDAR point cloud for ICP processing in Graph SLAM

I am currently in the process of implementing Graph SLAM using ICP and g2o in python 2.7 The data I have are pose data (4 x 4 transformation matrix) and lidar data ( in the format of [x y z 1] with ...
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2answers
170 views

Path planning algorithm better than RRT* and Artificial Potential Field

Hello robotics stack exchange community, hope my message finds you well during these challenging times. I need an opinion regarding path planning algorithms. Goal I am looking for a path planning ...
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1answer
50 views

How do I convert centre-returning joystick values to dual hobby-motor direction?

Currently my setup is: 2x hobby TT motors connected to a Pi Zero with a motor HAT Python script running on the Pi which runs a Blynk python client and controls motors via the gpiozero library Blynk ...
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0answers
33 views

Use Realsense camera to get the camera image

I have to use LIDAR in my project. I was searching for some LIDARs with a camera and came across the Intel RealSense d400 series. I know it has a camera but please suggest a way to use that camera ...
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2answers
260 views

Are Rospy subscriber callbacks executed sequentially for a single topic?

Suppose a ROS node receives new batch of data on a topic while the previous batch is still being processed by callback. Will ROS wait for its completion or will it spin a new thread and run both at ...
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1answer
30 views

Dynamixels (AX-12A) no longer detected after id change

I have 8 dynamixels that are connected together. Everything worked fine until I changed all their ids to 200,201,202, ... To change their ids, I used this python library. Now, none of my motors are ...
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0answers
62 views

BlueZero Remote API from V-rep using python

I have some issues when I am trying to connect python to v-rep using Blue Zero based remote API. The community of v-rep didn't have enough details and I have followed their information such as: copy ...
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0answers
53 views

Hand Eye Calibration Formula

I'm trying to write a Python formula so that my robot arm can pick up a tennis ball (I'll be adding a gripper soon). The depth camera is mounted near the toolhead. Any help on writing this formula or ...
2
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1answer
55 views

Make robot drive as far from obstacles as possible

I am trying to make robot drive around the room, avoiding obstacles with pathfinding. The problem is I get few waypoints from pathfinding algorithm for robot to drive to (green dots), but it drive a ...
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0answers
27 views

G-code to cartesian co-ordinate converter

Hope you all are doing well. So I built a 5 bar linkage mechanism using arduino and python.It uses 2 servos, an arduino mega, a 12v power supply,a dc-dc step down converter to power everything. The ...
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2answers
548 views

/odom topics not matching ERROR

I have an existing ROS workspace which was built in C++. I am trying to implement a node built by The Construct in python which reads distance travelled from the ...
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1answer
142 views

How to synchronise data for fusion in Kalman from multiple sensors with different timestamp information?

I'm using Kalman filter to track the position of a vehicle and receive position data from 2 sensors: A GPS sensor and an Ultrasonic sensor for which I want to implement sensor fusion into the Kalman. ...
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0answers
25 views

How to make x variable change each time and read its value from txt file

I am working on my undergraduate project and this is my first time in using use python to control parrot bebop 2 drone and use BCI or BMI technology. I have x variable (int) and I want to read its ...
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1answer
118 views

Plot a map using wheel encoder and IMU data

I want to plot a map( with matplotlib or any other library ) using a wheel encoder and IMU data. Eg:- For every 10cm robot moves it should draw line (in a graph) and draw angles depending on the data ...
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0answers
27 views

How to implement stop sign XML cascade? [closed]

After training my RC car, I use the following command: python drive.py --model trainmodel.h5 This gives me IP where I can go and see if the testing was successful ...
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0answers
40 views

Inverse Kinematics of Puma 566 giving low angle results with DH convention

I am new at the robotics area, and i need to deliver an activity until this week in my college based to solve the inverse kinematics problem from an article that doesn't have any code done, and after, ...
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2answers
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I want to actuate a motor based on a wav file, but it has too many samples per second

I am trying to actuate a simple DC motor based on a wav file. At the moment I am using the "cat vs dogs sounds" from Kaggle. One of the wav files in this DB looks like this: These audio files are ...
1
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1answer
300 views

ROS packages for *pre-planned* path navigation rather than path generation? (Turtlebot3/ROS)

I am working on a project in which users will create paths fully constrained in terms of position (using a separate piece of software), and a robot will periodically follow those paths. We are using a ...
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1answer
36 views

What should i do to rebuild robot salto from Berkeley uni as a mechanical engineering undergrad?

What are the main components of robot salto? What are the necessary skills and knowledges to reproduce it? Also as you can see, i am a mecheng and i want to reproduce this robot as finishing project ...
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0answers
40 views

Pausing at positing in GRBL while holding motor current

I'm trying to get grbl to move the carriage of my 2D scanner to a specific position, pause there for a certain amount of time (until the sensor does its thing), and then proceed to the next position ...
2
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1answer
673 views

Python PID tuning - Parrot Bebop 2 - Target follower - ROS

I'm developing a PID controller for making the drone follow a detected object. I used as reference these topics: Ttracking-objects-from-camera-pid-controlling-parrot-ar-drone Tracking-objects-...
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0answers
76 views

Mission Planner: How to create a custom Waypoint Command

I am trying to set up a waypoint in Mission Planner that causes the drone to hover, take sensor data from a custom sensor, then either land or continue hovering based off of what the sensor data says. ...
2
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1answer
757 views

ROS how to use published data in a python script (darknet_ros)

I'm writing a python script to run with darknet_ros and bebop_autonomy package in order to take the bounding boxes of the detected objects and depending on the position of the detected objects send ...
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0answers
62 views

Real-time python reinforcement learning library

I'm looking for a reinforcement learning library that can be used for real-time robot control. What I first had in mind was ROS to describe the robot, Mujoco to simulate physics, and OpenAI gym to ...
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0answers
177 views

Python, Universal Robots, Ethernet problem

This is in regards to a UR 10 running 3.5.3.10825. For the script urx_get_robot.py ...
5
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2answers
137 views

ROS Theoretical Question - How does work properly a node

I'm new at ROS and I'm trying to figure out how does the node works with a pyton/C++ code. I have two codes for the same situation: Use a Xbox Controller to move the turtle in turtlesim FIRST - ...
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2answers
2k views

Uploading a trained ANN to an ESP32 board

I am working on a project that requires training a neural network with humidity and temperature values. After spending a while googling on how to run a neural network on ESP32 (Wemos LOLIN D32 Pro), I ...
0
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1answer
64 views

Head movement using gyroscope

I have a headset that provides 3 axis gyroscope readings. I wish to find out movement of head for e.g. if a person is nodding left to right etc. But the headset give me values in angular velocity for ...
3
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2answers
135 views

iRobot Create 2 Wake over Serial on Rpi

So this thread is similiar to this one: IRobot Create 2: Powering Up after Sleep All except I am trying to do this on an RPi. I have followed these intstruction: https://www.irobotweb.com/-/media/...
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1answer
1k views

Convert local coordinates of a moving IMU to global coordinates

I am trying to compare the performance of an IMU in motion against an optical tracking system. The IMU has an accelerometer and a gyroscope and gives output in the local IMU coordinate frames. The ...
2
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2answers
107 views

Microcontrollers and Python

So I am fairly new to robotics however I do have some background with the python coding language. Recently I set myself the task of learning some basics for robotics just to increase my knowledge base....
2
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1answer
3k views

Is rospython subscriber thread safe?

I'm trying to write a python node, which has one class and two member functions as callback functions. so a TimeSynchronizer and Subscriber in a node. I saw in this link and tested that python ...
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1answer
153 views

Why won't my PID line follower work?

I'm trying to implement a PID based line follower. The robot has 2 line sensors with ranges from 0-200, with 0 being black and 200 being white. I'm trying to follow a black line. I'm struggling to ...
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0answers
88 views

help to find the bug for calculating inverse kinematic using jacobian

I am calculating inverse kinematic for 5dof robotic arm using Jacobian matrix (first time). i used following formulas to do my calculation and also implemented in my code. for more information please ...
1
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1answer
57 views

Image data fusion

I have three cameras separated by some distance, looking at a scene. I have calibrated them using checkerboard and I have their respective intrinsic parameters and their pose and rotation matrix, I am ...
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0answers
55 views

Writing IMU accelerometer data into as twist messages into cmd_vel

I am reading accelerometer data from the wiimote /wiimote/state topic. A sample of the data I'm working with is as follows: ...
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0answers
2k views

python code for closed form inverse kinematics solution

I solved the inverse kinematics of a 4DOF robotic arm (which is not planar) and I wrote this code bellow in python. The coordinates for each joint is: I considered the first three joints as a wrist ...
5
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1answer
391 views

Wait simulation time in a non realtime ROS simulation in Python

I want to control a quadrotor with a Python script and run the simulation as fast as my laptop can, not only in real time. I've modified my world and now the simulation runs with 7-10 real time factor....
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1answer
43 views

Fixing robot orientation using AR

I am creating a project where a robot needs to face a control panel and do some specific tasks. Some reference tags will be placed on the panel. I want to use the tags as AR reference and fix my ...