4 votes

Path following with precise positioning system (RTK)

Precise vehicle location is not a very useful piece of data in autonomous driving so I would not expect to see many products focusing on it. Path planning and following for cars is a solved problem. ...
hauptmech's user avatar
  • 4,415
3 votes

gear motor with encoder and Arduino Uno

The motor should not be connected directly to your power source since this will not allow it to be controlled by the Arduino. The encoder is a passive add-on to the motor (mechanical coupling only). ...
ScienceGeyser's user avatar
3 votes

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

You are essentially making your own IMU. The way this works is essentially: the accelerometer gives you linear acceleration the rotational gyro gives you angular velocity integrate the rotational ...
Ben's user avatar
  • 5,855
2 votes
Accepted

Finding relative location of Raspberry Pi robot indoors

For high cost and high accuracy, you can use motion capture systems such as https://www.vicon.com/, https://optitrack.com/, or http://phasespace.com/. These systems will typically have a dedicated (...
Ben's user avatar
  • 5,855
2 votes

Finding relative location of Raspberry Pi robot indoors

I think that the methods which require no modification to the environment--e.g. gmapping with 2D lidar or ORB-slam with camera--are probably too computationally intense it to run on the pi alone. You ...
tsbertalan's user avatar
2 votes
Accepted

Determine robot's position in a nearby room

Basically you can utitilize one global frame for both robots since each robot has its own SLAM. SLAM provides an estimate for a robot's pose (i.e. location and direction). If you unify the global ...
CroCo's user avatar
  • 2,453
2 votes

Calculating the distance of a point from point cloud data

These values are relative to the camera. Z is always positive as the camera can't see what is behind. X and Y can be positive or negative depending on if an object is left/right or higher/lower than ...
FooTheBar's user avatar
  • 1,375
2 votes

Determining position from a 2D map and LIDAR

I just wanted add on to both user12895 and AL-ROBOT's answers. Based on experience: What you need is an (Iterative Point Cloud) ICP algorithm. Do not worry, if the robot cannot detect the entire ...
JJerome's user avatar
  • 183
2 votes

Determining position from a 2D map and LIDAR

1- Of course you don't have perfect matches 2- ICP is not used for localization, it is used to calculate the transformation the robot's pose has undergone (T+R) 3- To localize your robot, you would ...
AL-ROBOT's user avatar
  • 319
2 votes

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

The short answer is that it's possible, but tricky. To estimate position you integrate accelerometer readings over time to get linear velocity estimates, and then integrate the velocities to get ...
xperroni's user avatar
  • 1,353
2 votes

Path-following algorithm and suggestions for mecanum robot

Let's suppose you have a required (continuous) trajectory in the form of an equation that you want to follow, for example take a straight line (whose equation is y=2x+5), you can break it down into ...
Muhammad Idrees's user avatar
2 votes

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

The problem you are describing is quite similar to line following from a controls perspective, there is a difference in how the line is detected. Line following robots use a wide variety of ways to ...
50k4's user avatar
  • 6,652
2 votes
Accepted

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

I can't use any line-following method. Actually, you are quite wrong, the way I understand the problem. It is a line-following. It is just that the line is not painted (like on the road). The line is ...
virolino's user avatar
  • 301
2 votes

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

Ask yourself if you really need accuracy or precision. Because I think precision is easier to achieve than accuracy for most arms. I am not sure I would be as worried about the actuator as the gear-...
Ben's user avatar
  • 5,855
1 vote

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

We developed this for pipeline inspections and used this to map a pipeline. We found magnetism not to be very reliable and did it without. It works, but you have accumulative errors that can be ...
Joey Joystick's user avatar
1 vote

Are there solid state directional sensors available?

This isn't something that can just be answered. There are numerous ways to do this. Low Tech: You can go low tech with IR emitters and retroflective tape (or retroflectors) with IR sensors. High ...
STEAMworks Learning Center's user avatar
1 vote

How to get the accurancy of the position system?

The amount of rotation that the motor is capable of depends on the physical design of the motor. Usually the motor is combined with a transmission (eg gears) of some kind which also influence how far ...
hauptmech's user avatar
  • 4,415
1 vote

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

I am not sure what you mean by 'displacement value which is acceleration independent'. The conversion of relative positioning you're getting from /dev/input/mouse will always depend on the DPI of the ...
HighVoltage's user avatar
  • 1,096
1 vote

Calculating the distance of a point from point cloud data

The XYZ readings from the camera are in the reference frame of the camera. @FooBar is correct about the X/Y values: they are planar about the center of the camera, just like the OpenGL viewing window. ...
robotsfoundme's user avatar
1 vote

bluetooth that could track mobile phone location

Yes it might be possible to obtain the location of the robot, if you use multiple Bluetooth nodes(preferably 4 excluding the one in the robots for a free space) and use the rssi values from the ...
5P1D3R_M0NK3Y's user avatar
1 vote

bluetooth that could track mobile phone location

For localization problems, you will always need to have some references to look at (using only the IMUs of the phone will lead in error as time increases). For example, GPS uses the relative ...
Guille Sanchez's user avatar
1 vote

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

I am not sure how you are driving your stepper motor. In case you developed your own way, you could connect an analog pin to the wires that drive the stepper motor. These should be able to detect an ...
some guy's user avatar
1 vote
Accepted

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

The problems of outdoor-tracking are described in http://www.tinmith.net/papers/piekarski-ismar-2006.pdf page 2. As a solution was named the WearTrack System which worked by ultrasonic technology. The ...
Manuel Rodriguez's user avatar
1 vote

Path following with precise positioning system (RTK)

Unless you want to put this product at the market (which I doubt), then I wouldn't hope for an RTK-GPS pair to solve your problem. It could help you, in the extreme case of a dense road network, if a ...
George ZP's user avatar
  • 550
1 vote

How to move robotic arm in straight line

First of all you should start to check 2 things: the angle $\alpha$ is given by some sensor the object and the path to the object (blue dotted line) both lie in the arm workspace If 1. is not met, I ...
N. Staub's user avatar
  • 1,412
1 vote
Accepted

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

Using the commanded speed in the prediction update of a Kalman filter which estimates speed and higher order states can be entirely reasonable. In situations where the time constant of the controller ...
holmeski's user avatar
  • 1,853
1 vote
Accepted

Robot positioning problem

This is another aspect of a longer answer I wrote here. Briefly restated, your problem is that a wheeled robot like this is nonholonomic, which means you can just use absolute encoder counts and get a ...
Chuck's user avatar
  • 16k
1 vote
Accepted

Position Sensor

The suggestion posted by N. Staub worked well for me, I was able to perform the hack onto the HS-422 where the min and max readings of the servo potentiometer were [0.34-2.04 Vdc] and by using Arduino ...
Iron Fist's user avatar
  • 137
1 vote
Accepted

Calculating J3 rotation relative to J2?

I think from the spec sheet, it means that at some configurations, J3 could actually reach +255$^\circ$. For example, when J2 = -100$^\circ$, J3 may be able to reach that maximum of 255$^\circ$. In ...
Petch Puttichai's user avatar

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