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7 views

Build real-time wireless camera trap

I am looking to build a camera trap for wildlife viewing, able to capture pictures (or even videos) in decent quality to be able to identify distinct features. I do however need to be able to see the ...
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0answers
10 views

Move two DC brush motors at the same time using Kangaroo and Sabertooth

I had been doing a project which we are using kangaroo and sabertooth 2x32 to move two brush motors with an encoder. There are many obstacles that we overcome. from different signal, tuning etc., ...
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0answers
15 views

Slowly pushing mechanism [on hold]

im kinda new into this so help would be needed. So i want to create a slowly pushing mechanism. I have a vertical hollow tube (there are items inside) and i want to create slowly pushing mechanism at ...
0
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1answer
48 views

Sequence of rotation [on hold]

I have a question about the basic of rotation. If you have a sequence of rotations, why does the first rotation get multiplied at last, as below? 45 deg. rotation around x 70 deg. rotation around x ...
1
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0answers
14 views

Angular Velocities of CoM in Global Coordinate

The block diagram of the robot is shown as above. Here, $\phi$ is the angle between $X_v$ and $X_0$ (Yaw angle of the robot), and $\psi$ is the angle between $Z_b$ and $Z_v$ (pitch angle of the robot'...
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0answers
11 views

how to integrate apm 2.8 and raspberry pi 3 for object tracking [on hold]

Please I want to carry out a project on object tracking, I have an APM 2.8 and a raspberry pi 3 how do I command the flight controller to takeoff directly from my pi interface?, any advice on how I ...
1
vote
1answer
26 views

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 ...
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0answers
17 views

Building trac_ik_python for Windows 10 using VisualStudio2019

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 ...
0
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0answers
16 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 ...
1
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0answers
21 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 ...
1
vote
1answer
33 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 ...
1
vote
1answer
44 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?
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0answers
29 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 ...
0
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0answers
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 ...
-3
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0answers
29 views

Old toy robot - anyone remember this? [closed]

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 ...
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2answers
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?
0
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0answers
13 views

How to create an artificial muscle in Gazebo? [closed]

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 ...
0
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0answers
11 views

Velocity obstacle method in joint space [on hold]

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 ...
0
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1answer
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 ...
0
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0answers
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: ...
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0answers
11 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 ...
0
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1answer
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 ...
0
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0answers
25 views

Why Drone flips over while taking off?

Noob here. Response is very much appreciated. I have built a drone based on apm 2.8. however, it doesn't lifting up and flip over when it start to fly. Can you please guide what could be the possible ...
0
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1answer
10 views

rtk-gps faster (60Hz) and cheaper?

The below rtk-gps measures position to about 1.5inches for $1500 and an update rate of 5Hz on gps, and it measures 12.6mm x 4.6mm so that it would easily fit inside of a 20mm-diameter tube-shaped ...
0
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1answer
33 views

Servo motor torque

I am confused with the torque ratings of servo motors, or I guess it is general while choosing any motor. For example a servo's torque is rated as 10kg-cm, so does that mean it can handle a 100N ...
2
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0answers
13 views

VFH/VFH+ Axis Orientation & Sensor Angles

I have been struggling with trying to get the VFH+ implementation working correctly using Orca-Robotics implementation which seems to be the same implementation used in the ROS package and MATLAB and ...
0
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0answers
21 views

RC controlled underwater robot [duplicate]

I am working on a project to build a remotely controlled underwater robot to work in pure water tank. The max depth the robot has to dive is 40cm, and the robot has no over-the-water antenna. I ...
0
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0answers
21 views

Coupled joints limimit

I have 6dof articular robot. All joints are revolute. The limit of 3rd joint depends on the position of 2nd joint. I need to write function which returns 0 if 3rd fits limits with respect to 2nd joint ...
1
vote
1answer
39 views

RC transmitter/receiver for underwater robot [closed]

I am working on a project to build a remotely controlled underwater robot. The max depth the robot has to dive is 40cm. I tested the 2.4GHz RC transmitter and receiver and it could work only up to ...
0
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0answers
36 views

Fusion multiple LaserScans to PointCloud

I am currently trying to do 3D SLAM with two 2D Lidars and possibly additional IMU in ROS. However, there seems to be no ROS package available to meet my needs. The closest one would be laser_pipeline ...
0
votes
1answer
32 views

Moving clock arms individually

I have as project to build something like this ( using arduino if possible ): http://clockclock.com The one modelization that came across my mind is to take 2 sticks ( as clock arms ) and command ...
-1
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0answers
26 views

how to rotate a small metal part, precise (0.01 Deg) and repeatable?

For rotating a (90 grams metal, 30mm*30mm*15mm) part in a system, I need a mechanism with these constraints: The part (and other attachments) can rotate with about 0.01 degree or less precision. In ...
0
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0answers
24 views

How can I break down this easily to find out the homogeneous transformation for 3 jointed robot?

I am a beginner at this and, I am trying to find the best way understand how to do this. I have tried youtube but, to no avail. I appreciate any tips.
0
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1answer
41 views

Localize a Mobile Robot on a Mirror

I am currently busy with a project which requires me to construct a robot capable of cleaning a heliostat (movable mirror used to redirect sunlight). Heliostats are basically large flat mirrors that ...
2
votes
1answer
21 views

Is there a table of DC motors in relation to weight/mass? I want to find the fastest for my build

I am building a line follower robot for a science competition, i have the weight of the components but i don't know what would be the fastest motor i could use to reach the best avg speed of the robot....
0
votes
1answer
24 views

Odometry heading and laser scan heading not point to same direction

please help, after so much research still cant find a single solution from google. some say offset, but there is no offset in the configuration. problem: odom direction and laser scan heading didnt ...
0
votes
1answer
26 views

How to convert serial data to sensor_msgs/Range Message

I have a ROS node which manipulates a serial frame, the frame contains ultrasonic measurements, I have to extract this measurement and publish it as ...
1
vote
0answers
29 views

Formation control for ground vehicles

I am working on a project where I am aiming at connecting multiple vehicles in a formation and allowing hive control of the formation. The robots (husky-like) use ROS and so I was hoping to ...
0
votes
1answer
31 views

Having trouble getting correct homogeneous transformation matrices for my robotic arm

I am working on a project to build and program a robotic arm. And, no, this is not a HW problem. I have watched a ton of tutorials on the HTM, but its still not fully clicking. The image shows my ...
1
vote
2answers
42 views

In path planning, what kind of path is feasible for a nonholonomic robot?

For a car-like nonholonomic robot, What kind of path is feasible? Is it right that a path is feasible for a car-like robot if it's curvature continuous, and the curvature on any point doesn't exceed ...
0
votes
0answers
32 views

Mobile Antenna question

I have a rocket-shaped (tube-shaped) mobile 20mm in diameter. From a base-unit, 600yards away, I want to be able to send two floats (call it x and y) every 1/60th of a second (60Hz data rate [or ...
0
votes
1answer
32 views

I want to activate a remote shock collar based on messages in a discord server

So, for starters - this is a kink thing and not an animal abuse thing. I have an introductory understanding of electrical engineering (the most complex thing I've done is make an oscilloscope from an ...
1
vote
1answer
27 views

iRobot Create2 Programmable Robot: what is already in the robot

I want to buy the programmable iRobot Create2 and I have some questions about: The "autonomous navigation" with obstacle avoidance is just implemented in the robot when I'll buy it? And what about ...
0
votes
0answers
17 views

How to install ROS melodic over Network proxy

Maybe it is a repeated question, but really i have no solution i am trying to install ROS melodic on Ubuntu 18.04.3 LTS, using my Wifi the things went good, but at my office where i have a desktop ...
2
votes
3answers
94 views

How to control the velocity of a mobile robot?

I have a differential drive robot whose linear velocity and angular velocity is to be controlled. The current strategy for doing that is: A high level path tracking module spits out the reference ...
1
vote
3answers
25 views

A powerful pull/rotate device that provides a certain (controllable) force?

I don't know how to call the device I'm looking for (or need to create), maybe you can help me with terminology too so I can at least search.. I want something that either rotates or pulls with a ...
1
vote
1answer
36 views

Is it to possible to measure a room exact with rplidar?

I want to measure a room using rp3+, rplidar, ROS and SLAM. It should be easy possible to create mapping of the room. But how exact it would be? Is it possible to get less than 1 cm precision over ...
0
votes
0answers
19 views

How do I know if a wheel and stepper motor fit together?

Looking for some wheels and a stepper motor to make a self balancing robot. How do i know if the stepper motor shaft can fit in the wheels? I cant find the shaft diameter when looking at some ...
1
vote
0answers
40 views

Partial CoM, the velocity Jacobian and Control

New to robotic arms here. I am currently working with a 6-DOF robotic arm shown below: I have derived the FWD Kinematics and mapped the joint angles and the resulting end-effector positions. When I ...
0
votes
1answer
43 views

Cannot get 3 DOF bicycle model to run correctly

I'm trying to simulate a vehicle using a dynamic bicycle model but I cannot seem to get it working. If I set a constant steering angle the lateral velocity grows exponentially and creates impossible ...

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