# All Questions

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### How to extract the servo motors of a Digital Micromirror Device?

The good news is, that modern DLP projectors are sold for a low price. Each of the projectors is equipped with a so called digital micromirror device, which is an MEMS array. It contains millions of ...
4 views

### Building trac_ik_python for Windows 10 using MSVC2019

I’m trying to build TracIK-python with Microsoft Visual Studio 2019 for Windows 10 and am making use of the available trac_ik_wrap.i file in the swig folder to ...
14 views

### HD Map Creation in Real Time [on hold]

I have a robot that I want to navigate through a complex environment. I want to make an accurate 360 degree surround view map of the robot's environment. How can I do this? I have 2 180 degree lidars ...
18 views

### Best Sensors/Upgrades for mBots? [on hold]

So i have regular mBot with black/white line follower & ultrasonic sensor. What would be the best thing to upgrade it with? Also is there something that is similar to those blue metal rods? I ...
29 views

### Complementary filter for gyroscope and accelerometer

I am trying to understand how the complementary filter works. I did some research and i found this: I am confused about the noise and drift before any filter is applied. I have 2 questions: In the ...
41 views

### Fusing Multiple Lidars Into 1 Point Cloud

I have a car with 8 lidars, each with a field of view of 60 degrees. My car looks like this How can I merge all the lidar readings into 1 point cloud?
28 views

### feedback linearization controller for a quadrotor

I am trying to develop a controller for a quadrotor using dynamic feedback linearization technique, but I am not sure I am doing thigs correctly. I know that for designing such controller I have to ...
5 views

### What is the ~tf_prefix parameter does?

I have a TurtleBot3 Robot and when I’m trying to do this command to start the nodes (The ROBOT is real) roslaunch turtlebot3_bringup turtlebot3_robot.launch I’m ...
28 views

### Old toy robot - anyone remember this? [on hold]

Apologies if this is not the right place, but.... Does anyone know what this toy robot might be? I was given it years ago when I first started robotics courses, now it has become a favourite with my ...
18 views

### Any alternative to finding singularity of Puma 560 than differentiating the Jacobian and putting the Det=0?

Any alternative to finding singularity of Puma 560 than putting the Jacob Det=0? Also when it says the axes intersect, which axes do they mean? The z?
13 views

### How to create an artificial muscle in Gazebo? [on hold]

I am looking for a function in Gazebo to shrink an object related to two other objects. The artificial muscle will have a mount on the rotating element to increase the available angles of rotation of ...
10 views

### Velocity obstacle method in joint space

The velocity obstacle (V0) method and it's variants such as the reciprocal velocity obstacle and optimal reciprocal velocity obstacle method have been deployed for multi-agent reactive navigation. By ...
16 views

### how to implement a wall following controller for a TurtleBot3? (ROS - python)

I want to implement a wall following controller for my TurtleBot3 (with ROS system). sensors which I have on the robot: lidar(360) and optional 2 ultrasonic sensors on the side (1 on left and the ...
5 views

### Dynamixel MX - Open CM 9.04 + Open CM Exp - Issue With Bootloader

I am using Dynamixel MX 64 AR with Open CM 9.04 + Open CM Exp using Arduino IDE. I am using the following code to find Dynamixel ID and Baud Rate: ...
10 views

### Trying to make a map with gmapping but Rviz shows nothing

I'm trying to visualize and create a map using a Lidar and Rviz. I have a Lidar that publishes the LaserScan data on /scan and that is visible in Rviz. That is working fine. I also have installed ...
24 views

### Gazebo GUI doesn't show up

I tried Gazebo 9 and 10 on Ubuntu 18.04 MATE and it quits in a few seconds without showing Gazebo GUI. I'm running it on 32-bit Intel CPU with 950 Graphics chipset (pretty old). Here is what I see in ...