All Questions

0
votes
0answers
4 views

Combining P and D gains properly

I'm trying to perfectly tune my quadcopter and I'm at the point where P gain feels about right as it tracks my stick movements perfectly, yet it wobbles after a sharp stick input. If then I raise my D ...
-1
votes
0answers
2 views

How can i connect arducopter to raspberry?

This is my school project. I would like arducopter connect to raspberry but I do not know how to do it. Please help me!
0
votes
1answer
17 views

Loop time for self balancing robot

I have been working on a self balancing robot and there are quite a few parameters and one of them is loop execution time (t_loop henceforth). To my understanding, the smaller t_loop, the better it is ...
0
votes
1answer
14 views

Is system identification and a physics engine the same?

In the control theory the term “system identification” is used quite often. A typical sentence in a robotics oriented paper is that the author is trying to “build a model of a plant with matlab”. The ...
0
votes
0answers
10 views

Inexpensive & minimally viable systems for testing SLAM algorithms?

I've been studying SLAM on my own for some time, I can sift through texts over texts and try my best understanding them. However, without actually implementing them myself, I think I still don't fully ...
0
votes
2answers
28 views

underactuated robot problem

Lets say the robot has 4Dof and the operator gives (x,y,z,roll,pitch,yaw ) as control input( rank(J) < dim(task) ). Now the robot is overwhelmed and will probably show some jerky movement. But can ...
-1
votes
0answers
5 views

Connecting a Roboclaw 2x15a to an Arduino

I'm new to robotics but have a background in programming. I recently purchased an Arduino Uno starter pack as well as a Roboclaw 2x15a motor controller with 118 RPM motors from ServoCity. I haven't ...
1
vote
0answers
4 views

L298N briefly works, then shorts when controlling Nema 17

I'm trying to control a Nema 17 stepper motor with a L298N H-Bridge. My wiring is as below (except I'm using a ESP8266 not a YUN, and I have a mains 12V supply rather than batteries). This is ...
0
votes
1answer
26 views

Head movement using gyroscope

I have a headset that provides 3 axis gyroscope readings. I wish to find out movement of head for e.g. if a person is nodding left to right etc. But the headset give me values in angular velocity for ...
-1
votes
0answers
13 views

What is a good way to measure the perpendicular distance (from a mobile robot eg) to a laser beam?

What is a good way to measure the distance (from a mobile robot eg) to a laser beam? The purpose of course is for the mobile to track the laser beam. The mobile may go temporarily off the beam by ...
1
vote
0answers
5 views

iRobot Create 2 Wake over Serial on Rpi

So this thread is similiar to this one: IRobot Create 2: Powering Up after Sleep All except I am trying to do this on an RPi. I have followed these intstruction: https://www.irobotweb.com/-/media/...
1
vote
0answers
7 views

Problem with UKF weights when calculating predicted state

I'm having troubles implementing a UKF during the calculation of $\overline{\mu_t}$, specifically in this step: $$\overline{\mu_t} = \sum_{i=0}^{2n}w_m^{[i]}\chi_t^{*[i]}$$ My problem I'm facing is ...
0
votes
0answers
15 views

I need to read a lot of analog signals without any analog pins

I have an nvidia xavier with gpio running linux. It should work very similarly to raspberry pis. I need to connect a bunch of pressure sensors, thermistor, potentiometers, and vibration sensors to my ...
0
votes
1answer
16 views

Accuracy of hall sensor encoders on Raspberry Pi

I have 2 motors (JGA25-370) with hall-sensor encodes. They emit about 90-100 interrupts every 100ms, so 1000 a second. Which means I have an interrupt happening every 1ms. The motors are driven by ...
-2
votes
0answers
27 views

What is a good way to measure the perpendicular distance to a laser beam? [on hold]

What is a good way to measure the perpendicular distance (from a mobile robot eg) to a laser beam?
0
votes
0answers
16 views

Combining data from 9DOF IMU

My team and I are building an AUV and are planning to replace the existing 6DOF MPU-6050 sensor with a 9DOF Adafruit BNO055 sensor. However, we're unable to figure out how to combine the data from the ...
0
votes
1answer
28 views

Which sensors can be used to feel breeze blowing by the robot?

Am faced with a situation where my robot needs to feel breeze blowing by over its artificial skin. While there exist many types of tactile sensors, nothing seems to fit the bill. I might abandon the ...
1
vote
1answer
23 views

How many encoders should I have?

I'm planning a robot vehicle and plan to get one or more motors that have encoders built in. How many encoders do I need I really need in order to gather solidly accurate information about speed ...
1
vote
0answers
18 views

How to calculate observation matrix Jacobians in EFK based mono slam? What are projection Jacobians?

I have been trying to understand an implementation of monoSLAM 1. But my question is generic to EKF based single camera SLAM. My Jacobian calculation leads to complex and lengthy expressions while ...
-2
votes
1answer
35 views

Why can't motors be as elegant as human muscles? Why do we have to use electromagnetism to create movement?

Pretty much as the title says. Why isn't it possible to build motors as microscopically and simply as they're built in humans? Why can't we recreate electronic nerves and muscles?
0
votes
0answers
12 views

OPENCV C++ VS17 and Motoman controller interface?

I have motoman robot for pick and place operation. I am planning to detect POSE of simple object using OPENCV with visual studio. But how can I give coordinates of object to robot controller for pick ...
1
vote
0answers
12 views

FastSlam2.0: ICP Scan Matching vs Odometry? for small Delta T

When working with a FastSlam2.0 algorithm, ICP Scan Matching is supposed to give more accurate measurements than odometry. The problem is, that given some noisy measurements from the laser scanner, ...
0
votes
0answers
12 views

message_filters doesn't call the callback function

I'm trying to use the message_filters in order to subscribe to two topics. Here's my code ...
-2
votes
0answers
13 views

How can I detect change of color of path for a lego ev3 robot?

I cant detect the inversion of color in the path my robot follows. the path color goes from black to white and the robot should be able to detect it. thats the code for color inversion detection
-1
votes
0answers
21 views

Depth Sensor and Depth Camera [duplicate]

What is the difference between a depth sensor and a depth camera ? I think that the depth sensor is the hardware tool equipped with a special software which can detect the depth in 3-dimensional ...
2
votes
1answer
25 views

How can I preserve a high framerate while using at least 1280x720 resolution on 2 USB cameras on the same computer?

To expand on this, I have a down-facing camera using the whycon ROS node on Ubuntu 16.04 Kinetic on a quad-core computer with 640x480@60fps MJPG video. I'm also using the ...
0
votes
0answers
17 views

What are the components required to mount a servo inside an ActoboticsTM facing outwards a channel?

Being new into the ActoboticsTM set, it's not always clear to me what the parts are supposed to do. I'm currently in need of placing a servo inside a channel facing outwards, as depicted on the ...
0
votes
1answer
25 views

Convert local coordinates of a moving IMU to global coordinates

I am trying to compare the performance of an IMU in motion against an optical tracking system. The IMU has an accelerometer and a gyroscope and gives output in the local IMU coordinate frames. The ...
-1
votes
0answers
24 views

Industrial robots and how to start [closed]

I want to start learning about industrial robots,i have experience with Arduino but whats the next step for start building industrial robots? Any help is appreciated, thank you in advance
0
votes
1answer
28 views

Quaternion error in one degree of freedom

I would like to control a system which orientation I measure with as quaternion based EKF in one degree of freedom. Obviously the simplest thing would be to convert the quaternion estimate to euler ...
0
votes
0answers
8 views

Compile webots for Python 3.6 for Windows

I would appreciate if someone could assist me in compiling webots source for Python 3.6 to allow me and others to use TensorFlow with it. I already tried but apparently there is something not ...
0
votes
2answers
21 views

ABB Object Oriented RAPID language

How do I create something like a class and have instances of it in ABB RAPID language?
0
votes
1answer
32 views

Microcontrollers and Python

So I am fairly new to robotics however I do have some background with the python coding language. Recently I set myself the task of learning some basics for robotics just to increase my knowledge base....
0
votes
2answers
33 views

outdoor autonomous robot [closed]

i had search over google and found out more or less some sensor that i could use like sonar, gyroscope, accelerometer,magnetometer and gps and 2d lidar (which is less expensive, around $300) i have ...
2
votes
1answer
50 views

extended kalman filters, linearization of output

Say, we are dealing with an odometric localization problem. In the below example, $(x_k, y_k), (x_l, y_l)$ are cartesian coordinates of the sensor and the landmark respectively. Then the output ...
0
votes
1answer
26 views

What are the differences between wheel and manipulator joint encoders?

As far as I understand the joint encoders output the angle and the wheel encoders output speed. Is that accurate? In either case, how do the differences affect the kinematic calculations, as in path ...
0
votes
0answers
8 views

How can I import openmv camera feed in MATLAB

I am planning to use openmv camera with wifi shield for my project. I want to import the video feed to MATLAB for further processing. As per my preliminary search it is extremely difficult and ...
-1
votes
0answers
26 views

Is robotics and automation a contradiction?

With the Meccano toy it is possible to construct a variety of useful machines. For example a knitting machine, a loom or a steam engine. What these machines have in common is, that they are doing ...
0
votes
1answer
24 views

How should I power my servo motor with the Adafruit PCA9685 chip?

So I have an Adafruit pca9685 controlling an HSB-9380TH servo and a MG-996R servo. I recently began learning about building robot so I apologize if these questions seem dumb. I literally spent a days ...
-1
votes
0answers
17 views

Building a mobile robot- Project

I’m trying to build a mobile robot that weighs close to 40 pounds and I’m trying to use a DC motor for the wheels but I don’t know what requirements the motor will need to have.
1
vote
0answers
30 views

Path Planning for Spherical Wrist (RRR)

I have found the inverse kinematics of a spherical wrist. The wrist is not attached to any other type of arm, it is the sole controller. Based on this IK solution, how can I generate a path plan for ...
-1
votes
0answers
17 views

sensor for knowing the exact position of charger

what can I utilities the charger with so the robot knows the exact position of it? acoustic location is not accurate enough even if it's hard to implement. lights are not good since the obstacles. If ...
0
votes
2answers
28 views

Identify contacts on wires of an electronic speed controller

I have got an electronic speed controller as pictured in the first image. What kind of contacts are those on the left? The second image is a closeup. edit to clarify question I am asking how to ...
3
votes
1answer
45 views

Input/output linearization

I am studying the book "B. Sicilliano -Robotics. Modelling, Planning and Control" chapter 11, Input/output linearization topic. Where does the formula for theta in 11.75 come from? In the case of the ...
0
votes
1answer
24 views

Humanoid robot with Raspberry pi [closed]

I am in the midst of designing a humanoid robot, and I am very new at this technical stuff, but I have found servo motors which are capable of producing 500 kg.cm. Now I am looking at making a ...
0
votes
2answers
46 views

I must determine the resolution of a control system when using an 8-bit encoder for a single-rotation joint

The length of the link is 50 cm and the arm moves 180 degrees. Can anyone help me? Out of the cosine theorem, $d = \ell \sqrt{2\left(\ell-cos\right)}$, I calculated the distance traveled by a linear ...
0
votes
2answers
44 views

How a quadcopter pitch/roll impacts thrust?

I'm thinking about how a quadcopter flight controller works, and I usually see that each motor speed is determined by a formula like: ...
1
vote
3answers
76 views

Inverse Kinematics Problem of Articulated Manipulators Arm

I have a robotic arm consist of three joints (servomotor for each joint), as shown in the figure below: Notes: Each servomotor rotates around 180 degrees. The angles of the theta2 and theta3 ...
0
votes
1answer
24 views

Powering servos for quadruped spiderbot using arduino uno [closed]

I am using 12 towerpro SG90 servos. What battery should I use for powering 12 servos for my arduino uno? Can i use the 12v battery, plug it in to 12v dc jack of arduino and tap the 5v output of ...
-1
votes
0answers
45 views

My robotic arm keeps falling down after it turns to a certain angle or above

As the title says, the arm keeps falling down rather than being stuck at the position it was set to be at because of the gravity pulling it down. Im using Raspberry Pi for this, some MG996R servos and ...

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