Robotics Stack Exchange
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1 answer

DH parameters to solve forward kinematics problem

When solving the kinematics problem for a robot using DH parameters, if there are some passive joints between the actuator and the end effector, do I have to define the axis and transformations of passive joints too just like for active joints?
Haider
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How to apply Inverse Kinematics with angle constrained servos?

I want to implement Inverse Kinematics and i understand the inverse jacobian method but the servos i have only have a range from -90 to +90 degrees, how can i implement this detail in the algorithm? I can't simply set each joint to its…
spetty flakson
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Permission to fly UAVs

Okay, this might sound like a stupid question but, is there some sort of a permission in the US I might require to fly a quadcopter or a UAV for that matter? I couldn't find much help anywhere else.
Chandough
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Handling PID DC motor control at low speeds

I am building a 4 wheel rover and am using PID DC motor control for the back set of wheels. The feedback for the speed is provided by Hall effect sensors, with two pulses per rotation. This means with the motor as 100% duty, the sensor returns a…
Dibly
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How can I create a robot like the EZ-B using a regular Arduino?

I am interested in building a robot like the EZ-B, sold by ez-robot.com. It comes with an SDK for Visual Studio and has direct scripting in runtime through a USB, Bluetooth, Wi-Fi, IRC or HTTPS connection. If I get a regular Arduino board, will I be…
Ess Kay
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Which is the best visual fiducial marker (2D barcode)?

Which is the best visual fiducial marker (2D barcode) for detection and robust and accurate pose estimation? Im not looking for a fiducial marker which can store lot of information. The main goal is just to get the pose of the marker with respect…
vacky
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1 answer

Quadrotor control using ArduIMU

We are using ArduIMU (V3) as our Quadrotor's inertial measurement unit. (we have a separate board to control all motors, not with ArduIMU itself). As mentioned here , the output rate of this module is only at about 8hz. Isn't it super slow to…
Michel Gokan Khan
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2 answers

Drone targeting

Imagine a "drone" and a target point on a 2d plane. Assuming the target is stationary, there are eight parameters: P = my position Q = target's position V = my velocity I = my moment of inertia w = my angular velocity s = my angular position T = max…
Gus
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Space elevator: What is still needed, apart from the cable and propulsion?

In order to build and operate a space elevator moving crafts and people into space, there are two big challenges that have not been solved yet: Finding a cable with enough tensile strength, Moving stuff along the cable at a reasonnable…
Nicolas Raoul
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Problem with vibrations in air bearing

We have an air bearing for a planar xy motion. Today it consists of four pockets according to picture. In the current design there are no sealings around the peripheries of the pockets and we suspect that is the reason we get vibrations. In the…
Johan Larsson
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Camera selection for long range stereo vision system (up to 100 meters)

I want to implement a real-time stereo vision system for long range (up to 100m) depth estimation. I know that there are some general considerations as described in this SOV post. I have seen some typical cameras such as zed stereo cameras which has…
Mr. Nobody
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Estimate Disparity Error for Depth Accuracy Estimation

I would like to get a rough estimate of the depth accuracy / uncertainty of a stereo camera system. For this I would like to use the basic formula in the attached image. What is still unclear to me is what's a reasonable choice for the disparity…
Silvan
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Explanation of Quadcopter Dynamics, Components and Control

I am about to build my own quadcopter from scratch. However i am having problem with understanding how it is possible to control the quadcopter without knowing the current rpm of the BLDC motors. According to my understanding the rpm is needed to…
Barney
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Kalman Filter GPS + IMU

I know this probably has been asked a thousand times but I'm trying to integrate a GPS + Imu (which has a gyro, acc, and magnetometer) with an Extended kalman filter to get a better localization in my next step. I'm using a global frame of…
aram
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"colcon_core.package_augmentation" Error When Building Python Package With Colcon in ROS2 Humble

I get the following error when trying to build my python package with Colcon build [0.235s] ERROR:colcon.colcon_core.package_augmentation:Exception in package augmentation extension 'python': Traceback (most recent call last): File…
umut373
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