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Questions tagged [python]

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

36 questions with no upvoted or accepted answers
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5
votes
1answer
598 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....
3
votes
1answer
72 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 ...
3
votes
2answers
1k views

Transform timestamped messages recorded in a bag file using tf messages

I have a .bag which contains recorded messages on topics /topic1 and /topic2. The messages ...
2
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0answers
94 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 ...
2
votes
1answer
222 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. ...
2
votes
1answer
916 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-...
2
votes
1answer
2k views

MSP (Multiwii Serial Protocol) receiving data with pyMultiWii issue

I want to get telemetry data from my flight controller (Matek F405-CTR) and send control commands to it via MSP protocol. I've already configured UART3 port on Matek in Inav configurator (look at pic)...
1
vote
4answers
466 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 ...
1
vote
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, ...
1
vote
1answer
522 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 ...
1
vote
0answers
56 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 ...
1
vote
0answers
87 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. ...
1
vote
0answers
96 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
vote
0answers
61 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: ...
1
vote
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 ...
1
vote
2answers
1k views

Error starting image_view video_recorder using launch file

To record .avi video, I am using video_recorder for the image_view package. I want to do this through the launch file. Here is the how I put it in there ...
1
vote
0answers
290 views

Continual error attempting to use MicroPython with HC-SR04 sensor on Bit:Bot

On my Bit:Bot from 4Tronix ([see here])1 I have an HC-SR04 ultrasound sensor attached. It uses solely pin15, for both trig and echo. I am able to use Microsoft MakeCode 'block editor' to get a ...
0
votes
0answers
10 views

Having Issues Importing and Using RLGlue locally with Python For Reinforcement Learning

I'm going through an online course on Coursera for Reinforcement Learning that makes use of RLGlue. I want to try to run and adapt the code locally, but am having issues using RLGlue, and not sure why....
0
votes
0answers
16 views

Ardupilot - Dronekit Setting the Current Location of the Vehicle

hope you are all doing well. I am doing in a project in which I receive GPS data (Longitude, and Latitude) from an Android device via an SQL server. What I am trying to do is to send this Longitude - ...
0
votes
1answer
41 views

Relative scale problem

I am doing Monocular Visual Odometry, and I have problem with relative scale. Most of the time its value is between 0.8-1.1, but sometimes it goes crazy and it has value 3,4 and once it had value 25. ...
0
votes
0answers
64 views

6DOF kinematic robotic arm programm

I am trying to find a well documented library which I can use for my 6dof robotic arm (https://www.thingiverse.com/thing:1693444) But I cant find anything :( Does anyone have a python/c code for ...
0
votes
1answer
37 views

Eliminating drift generated from double integration of acceleration signal using Envelope Method

I'm trying to remove the drift generated upon the double integration of a noisy acceleration signal. But this question discusses only removing the drift upon single integration to generate velocity ...
0
votes
0answers
109 views

ImportError: /opt/ros/kinetic/lib/python2.7/dist-packages/cv2.so: undefined symbol: PyCObject_Type

So I followed this guide to install opencv on Ubuntu 16.04 LTS https://www.pyimagesearch.com/2016/10/24/ubuntu-16-04-how-to-install-opencv/. When I try running a python script that imports cv2 I get ...
0
votes
1answer
151 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 ...
0
votes
0answers
74 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:/...
0
votes
1answer
85 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: ...
0
votes
1answer
40 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. ...
0
votes
3answers
376 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 ...
0
votes
0answers
38 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 ...
0
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0answers
42 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 ...
0
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0answers
29 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 ...
0
votes
1answer
219 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 ...
0
votes
0answers
71 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 ...
0
votes
0answers
209 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 ...
0
votes
0answers
366 views

What dependencies do I need for USB programing in python with pyUSB?

I am trying to get the usb.find command to work properly in a python script I'm writing on Angstrom for the Beagleboard. Here is my code: ...
-1
votes
1answer
88 views

How to subscribe message coming from a package of ROS into Python code of another package?

I am using darknet_ros_3d package and getting the published 3D coordinates. Now I need to subscribe these coordinates into a Python file (...