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Questions tagged [first-robotics]

Questions relating to FIRST programs.

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18 votes
3 answers
13k views

Calculating the efficiency of Mecanum wheels

I'm part of a FIRST Robotics team, and we're looking into using Mecanum wheels for our robot. What are the advantages and disadvantages of using Mecanum wheel versus regular ones? From looking ...
Michael0x2a's user avatar
5 votes
2 answers
5k views

Designing a 5 bar linkage robot: Plot Clock

I am a beginner at robotics. I recently stumbled across this robotic clock on youtube. I am an electrical engineering student and am interested in submitting it as my minor project. I have studied ...
Piyush Menghani's user avatar
3 votes
1 answer
1k views

How can I use an RC servo to rotate more than 360 deg and still maintain positional accuracy?

RC Servos are great because they are low cost, widely available, easy to control, and pretty accurate. One disadvantage is that they usually have very limited range of motion. This is because they ...
markshancock's user avatar
3 votes
1 answer
342 views

image processing

I am making a Robot goalie, the robot is supposed to detect whether a ball has been thrown in its direction , sense the direction of the ball and then stop it from entering the goal post. A webcam ...
user10752's user avatar
3 votes
1 answer
78 views

What does it actually mean by Task Planning?

According to the research paper Parallel process decomposition of a dynamic manipulation task: robotic sewing (D. Gershon, DOI: 10.1109/70.56654): Abstract - ... The task planner approach, as ...
user366312's user avatar
3 votes
1 answer
129 views

Flight controller drift issue

(This is a little long) So I am working on a drone recently, and aim to control it using an Android device. I've read that it can be done using a Raspberry Pi and Multi Wii, but I couldn't find any ...
user148898's user avatar
3 votes
1 answer
37 views

What parameters can be/should be looked on while deciding to work with a microcontroller in a bot

I understand that choosing a microcontroller is all based on the needs and that there is no perfect Mcu.presently I have to select an MCU for a robot my team is building for the 2018 Abu robotics ...
nalostta's user avatar
2 votes
2 answers
324 views

Is there a Java or mathematical algorithm for Pure Path Pursuit?

I was building a robot which I wanted to have smooth consistent motions and pathways. I am somewhat familiar with Pure Path Pursuit and wanted to know if someone could point me towards a mathematical ...
Aditya Mangalampalli's user avatar
2 votes
3 answers
845 views

Robots with less than 6 degrees of freedom

Is there any possibility to have a robot with less than six degrees of freedom & still be able to achieve any position & orientation around end effector?
Akhil Kathi's user avatar
2 votes
3 answers
298 views

First steps in robotics

I am a High School student and a beginner coming to Robotics and I have no idea where to start. I have spent days searching tutorials and books I could read to start building and programming my first ...
Alex's user avatar
  • 21
2 votes
1 answer
90 views

Is there a more accurate feedback loop with less overshoot or disturbances than PID?

So I was starting a robotics project and turns out that PID hasn't served very well in the past. So I was wondering if there was another feedback loop mechanism which has less overshoot and is more ...
Aditya Mangalampalli's user avatar
2 votes
1 answer
34 views

Robot odometry calculation On uC or on pc

I need to do odometry calculations but I'm contemplating where I should do it. I'm using a core i5 6th gen mini pc with 8Gb ram so it's plenty strong for a robot brain but my issue is with the ...
Faraz Ahmed's user avatar
2 votes
2 answers
411 views

How to calculate potential enegy of manipulator dynamics?

I'm trying to obtain dynamics of a 4 DOF robot. Firstly, I calculated all Transformation matrices and Jacobians. While solving Lagrangian there is two main things one is kinetic energy and the other ...
RAKESH KUMAR K's user avatar
2 votes
1 answer
4k views

Error while running rosserial node in ROS

I have an Arduino connected to ROS through serial port. I wrote an ardiuno code to drive motors. below is my code. ...
user3725099's user avatar
2 votes
0 answers
163 views

Kalman Filter for 2d pose

I'm really sorry if this is a dumb question, but I don't have a clue on how to do this. I'm trying to write a kalman filter with a State vector of : $$ {x, y, \dot{x}, \dot{y}, \ddot{x}, \ddot{y} ...
agi gun's user avatar
  • 21
1 vote
2 answers
2k views

How do I find the inverse kinematics of a 5-DOF manipulator having the following DH parameters?

alpha = [ -90, 0, 0, 90, 0] a = [ 0, 400, 200, 0, 0] d = [63.5, 0, 0, 90, 100] I am trying to calculate the joint angles but I am stuck ...
Amit Deka's user avatar
1 vote
4 answers
376 views

Question about programming approach of a dog like quadruped robot

I and my friends are planning to build a dog like quadruped robot. We have designed it like MIT Cheetah Mini like legs structure, each leg having 3 Servos, 3rd DOF for rotation. We have calculated ...
Inv3nt0r's user avatar
1 vote
1 answer
435 views

Matlab Simulation using Webots!

I am trying to run this youbot ( sample world) from webots, where the controller is implemented in MATLAB, on running the code it pops out the following error seen in the picture attached. I have also ...
Aditya Sharma's user avatar
1 vote
1 answer
572 views

Conversion of roll, pitch and yaw from ENU to NED

I have roll, pitch and yaw values in an ENU frame. How can I convert it into a NED frame?
Abhishek Yadav's user avatar
1 vote
1 answer
352 views

What is the concepts of submaps in LIDAR based graph slam algorithms?

I have been reading some slam papers recently and many of the papers mention building and performing scan matching on submaps instead of individual poses. Does it mean that a submap is just a single ...
Zain's user avatar
  • 71
1 vote
1 answer
176 views

Controller Design using Webots!

I am trying to work on a Digital Twin of a Physical Robot which is used at my uni. I made a rough model of the robot using Webots (Open source). I need to design certain controllers aiming at the Tilt,...
Aditya Sharma's user avatar
1 vote
3 answers
89 views

Beginner Sets for intermediate devs

For a longer time I'm looking for some kind of robotic set, which is programmable, but most things I've found are related to child education or involves a lot of putting all the hardware parts ...
xhallix's user avatar
  • 113
1 vote
1 answer
83 views

Combustion engine controlled with a remote [closed]

How can one control a combustion engine using a remote control. Or how would you make a car controlled using a remote.
sohaib shaikh's user avatar
1 vote
1 answer
79 views

Robotics Structure

I am a kind of a new developer and a beginner in Robotics and AI. I am currently learning using the Arduino Uno starter kit. My knowledge on C & C++ is on the beginner's level but i get the whole ...
user avatar
1 vote
1 answer
53 views

How to keep track of (x,y) co-ordinates of a line-following bot?

I am working on a bot that follows a certain line path based on some pre-determined algorithm. I would like to know what the (x,y) co-ordinates of my bot are as it traverses with respect to some pre-...
cuebits's user avatar
  • 111
1 vote
1 answer
297 views

Joystick Rate Limit Filter For FRC Java Programming [closed]

I am a programmer for my school's FRC robotics team and have received the request from our hardware/driving department to limit the speed at which the robot's motors can accelerate given a joystick ...
Nick's user avatar
  • 111
1 vote
0 answers
61 views

Accessing Proto Fields of Underlying Proto Object in Webots

I'm working on integrating Webots with FIRST Robot Code's builtin simulation utilities. As part of this, I've created a few base protos which define common types of parts, and extended them with ...
CoolSpy3's user avatar
1 vote
0 answers
102 views

How to calculate the required torque of motor for bipedal robot

I just create a bipedal robot in SolidWorks and after I got all components, I realise that I need select the correct motor for the robot. There will be four motors equipped in the robot, two for hip ...
huiduan's user avatar
  • 11
1 vote
2 answers
910 views

Is there a way to send commands to the Staubli CS9 from remote system via TCP/IP??(like ur_rtde, urx libraries for UR robots)

I am new to ROS development and Staubli robots. Though i have some prior knowledge on UR5e, I am finding it hard to understand the architecture of Staubli and its other programming interfaces (like ...
Aswathaman G's user avatar
1 vote
4 answers
926 views

Robotic arm servo motor- Not enough torque

I require your help regarding a problem I’m encountering. I am a beginner in robot modelling. I am designing a robotic arm for agricultural use and I am having issues with the motors. I am using ...
el.T's user avatar
  • 11
1 vote
0 answers
61 views

Inverse Kinematics of Puma 566 giving low angle results with DH convention

I am new at the robotics area, and i need to deliver an activity until this week in my college based to solve the inverse kinematics problem from an article that doesn't have any code done, and after, ...
theEarlyRiser's user avatar
1 vote
0 answers
708 views

How to make a line following algortihm for an A.R Drone 2.0? [closed]

I am trying to develop a line following algorithm where a drone will detect a bounding box and follow what is inside the bounding box. I am filtering all the colors to only see the color white. Once ...
mike's user avatar
  • 11
1 vote
0 answers
34 views

Stepper Motor Torque [duplicate]

Tried searching for this answer in a simple way but can't seem to find the answer.. I have a 3 axis Bipolar Nema 17(Took off my 1st 3d printer =) ) robotic arm(Homemade) and provides 28oz-57oz of ...
user17381's user avatar
1 vote
1 answer
92 views

Building a stationary robot which can talk [closed]

I am a Computer Science major and I only have basic ideas on Robotics. I am planning to build a stationary cubical AI. The main purpose of this bot will be that, it will have a sensor to check if ...
Saujan Uprety's user avatar
0 votes
1 answer
61 views

Definition of robotics manipulator?

I'm new to robotics, I don't understand the way wikipedia defines robotics manipulator. If there is no any direct contact how could the robot move things within his work envelope. In robotics a ...
Henok Tesfaye's user avatar
0 votes
2 answers
262 views

Low power to motors -- motor power jumper issue

I'm currently working on my first robotics project using the Initio kit from 4tronix powered by Raspberry Pi. The setup was fairly simple, and I've been testing it out over the last couple of days. ...
wrigley06's user avatar
  • 101
0 votes
2 answers
83 views

Is it possible to use coordinates to modify the floor into a polygon in Webots?

I'm using Webots to model an irregular polygon floor for a coverage problem. I want to define the floor using the coordinates of the vertices. So far I have been able to generate an irregular polygon ...
Jay's user avatar
  • 1
0 votes
1 answer
40 views

How can I allow for this code to switch from remote control to autonomous?

//ERROR: Task 'autonomous' is not defined at global scope level ...
Stackcode12's user avatar
0 votes
1 answer
193 views

why atleast three points are needed to control 6 dof?

I am reading tutorials on visual servoing using Hand book of robotics and there it is mentioned that in order to control camera's six dof we need atleast 3 points. I didnt quite get the idea behind it?...
Zain's user avatar
  • 71
0 votes
1 answer
138 views

Can you detect if encoder wire is connected on a motor?

I am writing some logic for a PID controlled catapult (In order to improve precision). That is all fine and well. However, if, for some reason, the encoder wire disconnects, the motor spins ...
GracefulLemming's user avatar
0 votes
1 answer
2k views

can we detects animals through PIR(passive infrared sensors)

as i dont know that what kind of radiation animals emit. as humans emit IR radiations so PIR sensors help to identify humans. pls suggest me if someone have knowledge about sensors which detects ...
Ranjit's user avatar
  • 1
0 votes
1 answer
48 views

Aspiring to build a space rover from scratch. From where to begin?

What fundamental concepts, beginner-friendly resources, or online courses would you recommend for someone starting with little to no background in robotics? At first, I want to build a an autonomous ...
Ghufran Fazal's user avatar
0 votes
1 answer
306 views

How to calculate potential enegy of manipulator?

I'm trying to obtain dynamics of a 4 DOF robot. Firstly, I calculated all Transformation matrices and Jacobians. While solving Lagrangian there is two main things one is kinetic energy and the other ...
RAKESH KUMAR K's user avatar
0 votes
1 answer
193 views

How to calculate the pitch of the quadcopter rotor blade and their efficiency?

I have gone to some of the blade designs and profiles of the blade which suits my requirement. But, once after entering the Theoretical calculation, I was stuck in the determination or the ...
Praveen kumar selvaraj's user avatar
0 votes
1 answer
15 views

Need Suggestions for real-time number or object detection with Arduino + MATLAB? [closed]

I'm working on a line follower robot. its a kind of waiter robot. and i am facing problems in detecting customer table. can you guys please suggest me some ideas to detect customer table. i want to ...
Muhammad Faran's user avatar
0 votes
1 answer
267 views

How to determine x-axis if the two z-axis are parallel in Denavit Hartenberg representation

I have problem of determining the DH table, specially finding x axis when two z axis are parallel to each other
Optimus Prime's user avatar
0 votes
2 answers
431 views

How to get starting location of robot using IMU Sensor (without using gps)

i have one robot, i have to get the initial location of that robot. then when we move the robot from that location, and when we give the command like "HOME" then it should go that initial location. ...
Ajinkya Khaladkar's user avatar
0 votes
1 answer
480 views

How can I measure the height of an object with a single sharp sensor (GP2Y0A21YK0F)?

I have one sharp sensor and I have to use it to measure the height of a block (6cm - 12 cm). How can I accomplish this ? Actually it is to be connected to a robot which will move near the box and ...
Shivendra's user avatar
  • 143
0 votes
0 answers
15 views

What components and valves do you need for this pneumatic system of 4 actuators powered by commands and distributed in 2 lines?

I was designing a pneumatic system, fed by a compressor (Tank = 6 liters, Pmax = 8 bar, Motor power = 1.5 HP, Flow = 180 l/min), and consisting of its FRL, some hoses for the ducts 4 mm standard ...
Matias Nicolas Rodriguez's user avatar
0 votes
0 answers
36 views

How to rotate a handle shown in the below picture using raspberry pi

Need ideas in the direction for to rotate below circled handle to be rotated robotically using raspberry pi etc
Papasani Mohansrinivas's user avatar