Robotics Stack Exchange
Robotics Stack Exchange

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1500 questions
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2 answers

Depth map with Raspberry Pi

Is it possible to get two images from the Raspberry Pi camera mounted on a remote controlled bot and have them sent to a computer through Wi-Fi and process the images in the computer to generate a depth map? All this is to be done in a very short…
user1989
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Force controller with feedback issues

I'm implementing a force controller on a robotic arm, where the force input comes from torque sensors in the joints. I have calculated the cartesian force on the end-effector from the joint torques, and I can move the arm by setting cartesian…
Ove Baardsgaard
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4 answers

Building a stationary robot. ROS the right tool for me?

I'm wondering if ROS is the right system for me. I'm currently involved in a project which consists of building a device that has the purpose to take spectroscopic measurements using a laser and a spectrometer, controlling servos and reading outputs…
Frimann Bjornsson
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1 answer

Kinematics with Product-of-Exponentials terminology: not forward, not inverse

I'm working on a kinematic estimation algorithm, and am trying to come up with the right terminology. I'm using the Product-of-Exponentials formulation for kinematic chains (and ignoring position for now): $R = e^{\omega_1 \theta_1}e^{\omega_2…
Eric Peltola
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May I have some suggestion on inexpensive robotic arm?

I want to build some simple application. I need a 5 or 6 degrees of freedom robotic arm. The arm must have feedback, so that I can control it preciously. The arm must be able to handle at least 5 lbs. And the arm would be able to work 10 hours a…
Marco
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1 answer

High power jumping mechanism in small robots

I recently saw this video on YouTube featuring a jumping robot: 5 Fastest Robots In The World I was curious how this is accomplished mechanically? Do they wind a strong spring or use some sort of air powered piston?
FutureCake
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1 answer

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 different flight commands (takeoff, landing, ecc)…
Ilyas
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1 answer

Short range stereo vision

I am designing a stereo vision system for short depth range (15 cm to 35 cm) and I have some problems about baseline, focal length and depth range. My application is to scan an animal tissue (meat, chicken breast) with the stereo vision system with…
Guangshen Ma
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1 answer

3D Direction Sensor - Question from a Neuroscientist

I'm posting here on the advice of r/diydrones, who said you're the people to ask. I'm hoping you might be able to help out with a problem i've come across in my research? I'm a Neuroscientist working on spatial cognition. Broadly, i'm looking to…
user22678
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1 answer

Digital servo shaking

i need your advice if someone experienced something similar. I try using digital servo but when i tried to connect it to board by this tutorial https://blogs.oracle.com/hinkmond/entry/connect_robot_servo_to_rpi3 servo motor only shakes for first ten…
dukatmar
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2 answers

Making a motor controlled joint passive

Anyone know of a good (and economical) way to make a motor controlled arm become a passive link on trigger? That is, the joint can be active (motor controlled) or passive (rotate freely). The tip of the arm weights 3kg and the length is 15cm.…
John M.
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3 answers

Finding correct RPY for approaching a known point on a plane

I have a robot with 6 DOF that I want to use to grab a hanging sheet at a specific point near its edge. The grip needs to be perpendicular to the edge and co-planar with the point of course. I have the inverse kinematics and I have the…
asdfghjkl
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3
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3 answers

Interference caused by multiple robots during task completion

Suppose there is an area to survey. If we deploy one robot it takes time T to sweep the area. Now if we deploy 2 robots, we would expect it to take time T/2. However in reality, because we are sending two robots, we would have to implement…
user_1_1_1
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1 answer

How is the GPS fused with IMU in a kalman filter?

I've been trying to understand how a Kalman filter used in navigation without much success, my questions are: The gps outputs latitude, longitude and velocity. While the IMU outputs acceleration and rate angles. To use A Kalman filter, measurements…
Diamondx
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Sensor model and Inverse sensor model using occupancy grid mapping with lidar for particle filter

I'm a bit confused about how one goes about calculating the sensor model $p(z_t|x_t, m) $ and inverse sensor model for position $p(x_t |z_t,m_{t-1})$. From this answer, it seems like one way for calculating the inverse sensor model would be to…
oswinso
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