# Questions tagged [precise-positioning]

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### How to: implementation problem with Position control on a 3 Wheels robot (2 motorized) with velocity profile of trapezoid

I'm trying to apply position control in a wheeled robot, controlled by an arduino mega. The robot has two wheels powered by two dc motors (1 motor for each wheel) and one castor wheel. In order to ...
1 vote
314 views

### How to detect the position in a linear actuator?

I was planning on 3D printing my own 30 cm stroke length 3D printed linear actuator and I don't know how I could read its position, or tell it to go say to 16.5 cm. I used this video, 3D Printed ...
122 views

### centimetre accuracy using IMU, is it possible?

I need to track hand movement, most importantly its vertical position to centimetre accuracy. I've tried this with IMU MP6050 but the errors I get from double integration are huge. Is there a way to ...
25 views

### Automatic homing on cobots after a collision

I am in the midst of automating a mechanical process using a Dobot MG-400 cobot (in a lab setting, using a vision system to present a patient sample to a piece of sampling equipment). These arms are ...
22 views

### Estimating extrinsic parameters in stereo vision via sensors

I have multiple (around 6) cameras with a distance of around 4 meters to each other filming an object and I want to reconstruct the 3D shape of it. The cameras are attached to tripods and thus can be ...
1 vote
30 views

### Resources for precision aiming, trying to aim camera long distance

I'm looking for resources online regarding precision aiming of a camera at a target that is far away. I'm a neophyte here, and I was hoping to see what kind of mechanical designs people have had and ...
1 vote
82 views

### Move gantry system to detected position in image plane

I have the following simplified gantry system (cartesian robot) that can move in the x axis direction: My goal is to position the red pointer on top of the target (i.e., I want the real world x-...
37 views

### What type of actuators are needed for a high accuracy, low load weight robotic arm?

I am trying to build a robotic arm that needs to lift a very low amount of weight (between 0.01-0.05kg) at a time, but it needs to be very precise (+/- 1mm accuracy ideally). The robot really only ...
299 views

### gear motor with encoder and Arduino Uno

I'm working on a project where using a gear motor with an encoder and an Arduino Uno. I have not done Arduino in a long time and am struggling getting it to do what I want. If you look at the wiring ...
117 views

### How to go about programming Robot Arm with 3D point

I have a 6 DOF robot arm that I am programming. I want to be able to move the arm's claw to a 3D point in space. In order to do that, it needs to know the best combination of movements that will take ...
96 views

### 6D pose estimation of a known 3D CAD object [closed]

I'm looking for a codebase for 6DOF pose estimation of a known 3D CAD object with RGB or RGBD. It must be: -Usable commercially (licensed under BSD, MIT, BOOST, etc.), not GPL. -Easy to setup and use (...
11 views

### Real-Time, App-Based Tool Tracking and Inventory Management System

For one of my classes, I need to create a sensor system that can connect with an app that will be able to track when specific tools leave a certain area. I do not know which sensor to implement that ...
1 vote
143 views

### Easy cm accurate GNSS / GPS for rover with base station? [closed]

I am trying to design a system to measure snow depth during snow production on a tiny ski resort in Denmark. My idea is simple: Drive a rover over the ground during the summer, and obtain height ...
56 views

I’m trying to solve for the “curvature” of a road, and wondering if this can be done with a standard mobile phone. If I have a mobile phone fixed onto my vehicles windscreen, using only standard ...
1k views

### Is it possible to track position using gyroscope and accelerometer without a magnetometer?

I'm looking for help on a project where I will be placing sensor data in 3D space using augmented reality. Most solutions I have found for finding position with an IMU involve the magnetometer, but ...
152 views

### What are joint angles of Kinova Jaco in home position?

I want to work with Kinova Jaco with spherical wrist in CoppeliaSim, because currently I do not have access to a physical manipulator. The model there is in reset configuration (arm fully extended and ...
144 views

### How to make my robot move parallel to edge of the table?

I have an autonomous differential drive robot that moves on the floor and its purpose is to always move parallel to the longer edge of the table (just assume that the table never ends). It looks ...
2k views

### Calculating the distance of a point from point cloud data

I'm getting the x,y,z values for three points as follows: x : -0.357200 y: -0.205010 z: 0.940000 ...
957 views

### How to get position (X Y values) from a USB optical mouse

I want to use an optical mouse to measure displacement in X and Y direction of my robot. I'm using Ubuntu mate 18.04 on raspberry pi and wrote the following python code : ...
416 views

### Path-following algorithm and suggestions for mecanum robot

I have a robot with four mecanum wheels (blue square) that can move in an open-space room. The position x,y of the robot is measured in a very accurate way by a fixed position sensor (red circle) that ...
49 views

### Are there solid state directional sensors available?

I have no problem building little robots which are more or less self driving RC cars. Now I want them to be aware of and interact with each other. In simulations they all know the position of all ...
143 views

### bluetooth that could track mobile phone location

newbie here. after my research, i couldnt find anything that could found what i wanted to search for my project(following robot for indoor location). without gps, bluetooth only, could i get the exact ...
415 views

### How to tell if a stepper motor position is moved by external force?

I'm designing a round knob positioned by a stepper. The knob is intended move by an external force while positioned by the stepper. I'd like the stepper to release (power off) when the knob is ...
29 views

### How to get the accurancy of the position system?

I want to build a system for positioning objects. It should be driven by a DC motor and a sensor should control the rotation angle. For the positioning I want to design (calculation) the accuracy. ...
6k views

### Determining position from a 2D map and LIDAR

We need to determine the 2D position of my robot. To do so, we have a LIDAR at a known high, with an horizontal plane, which gives us the distance to the nearest point for each angular degree (so 360 ...
49 views

### Appropriate distance sensing technology for specified conditions [closed]

I have been considering different distance sensing technologies for the following circumstance: Range needs to be about 2.5 meters The surface being measured is a wall that is painted black The ...
2k views

### How to move robotic arm in straight line

So here is my problem. I need to grab an object with my robotic arm, but I don't know the position of the object. The only thing I know is the angle between object and gripper. You will maybe better ...
1k views

### Finding relative location of Raspberry Pi robot indoors

I would like to have a Raspberry Pi robot that can find its location in a room relative to an origin point. What methods would be cheapest? What would the most accurate be? Are there any others ...
2k views

### Radio triangulation with Raspberry Pi

Currently, I am thinking that since electromagnetic waves loose energy over distance, you might be able to figure out the relative distance to each of three radio "beacons" and use this information to ...
1k views

### State prediction of vehicle with Ackermann steering geometry using Kalman-Filter

I am trying to have a Kalman-Filter (or Extended-KF) give me positions for a small remotely controlled vehicle with an Ackermann steering geometry (moving on a plane surface). The control commands I ...
343 views

### Robot positioning problem

The problem i am facing is to try and calculate the x and y position of a robot with dead reckoning. Reading from the encoders and getting proper rotations of the wheels of my robot works. The robot ...
1 vote
116 views

### Position Sensor

During my design of a simple robotic arm, where I 3D printed most of the parts, then used these HS-422 servos, it turned out that for a better control precision and to be able to apply Inverse ...
1 vote
77 views

### Calculating J3 rotation relative to J2?

From any robot spec sheet: I am assuming that the range of motion given for the J3 or 'U' axis is specified as a function of the position of the lower or J2 axis. Correct? How do I find the absolute ...
93 views

### Controllling an industrial robotic arm

How can you control a servo driver (delta, ...) with an industrial PC? To control position and velocity of a servo you need PWM signal to the servo drive (amplifier), but how do we create the signal ...
1 vote
80 views

### Kalman filter: 3D measurement error to individiual components

I'm working on a Kalman filter for estimating the position of a point in 3D space. I know that I can measure its 3D position directly with a variance of about 2 mm (in other words: the variance of the ...
570 views

### How to properly calibrate a magnetometer in IMU for precise yaw?

EDIT: Moved to ElectricalEngineering StackExchange Community I'm using Sparkfun Razor IMU 9DOF sensor which incorporates accelerometer, gyroscope, and magnetometer, for giving the Euler's angles (yaw,...
1 vote
217 views

### Accelerometer, gyro, and magnetometer sensor fusion for material resource survey

As a hardware engineer, I have studied quite a lot on sensor spec such as Accel, Gyro and Magnetometer including custom made fluxgate. I have studied matrix and quadarion (complex number) and so on. I ...
1 vote
710 views

### Is there a portable and accurate sensor to measure the position of the hand relative to the body?

My team has been working on a wearable glove to capture data about hand movements, and use it as a human-computer interface for a variety of applications. One of the major applications is the ...
10k views

### Using Accelerometer, Gyroscope and any sensor to track speed, position,

Problem Currently working on reverse engineering this application zepp.com/baseball. This is a wearable device that can track a users speed positional tracking when the object makes contact with ...
1 vote