Questions tagged [sensors]

A sensor (also called detector) is a converter that measures a physical quantity and converts it into a signal which can be read by an observer or by an (today mostly electronic) instrument.

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8
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1answer
5k views

Angle Random Walk vs. Rate Noise Density (MPU6050)

I’ve made a datalog from a MPU6050 (IMU: gyroscope and accelerometer) at 500Hz sample rate. Now I want to calculate the characteristics from the gyro to evaluate the sensor. For the gyro I’ve found ...
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2answers
28 views

Measuring a Motor's Internal Temperature

As a final safety measure regarding some high wattage motors, I want to measure their temperature (either internal or surface) in live time so that I can automatically kill the power if it crosses a ...
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1answer
18 views

Does an S type load cell need to be loaded perpendicular to its screw holes?

I know that a bar type load cell needs to be setup as shown here as to flex the strain gauge However, most tutorials or guides show how to setup an S type load cell like this (for tension) and not ...
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0answers
74 views

Assistance in finding correct LIDAR for short-range object detection task

I am working on a task that involves finding a distance of a moving object going a static linear object, e.g a long pole. After trying some approaches (mostly involving stereo vision), I have come up ...
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29 views

Angular movement of a controlled arm relative to an object via Two IMUs

I've been tasked to use two YEI 3-space sensors (IMUs) to detect the azimuth and elevation (altitude in the image below) angle of a moving arm with respect to a fixed object, with a sensor on the end ...
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25 views

Dead reckoning position estimation

I attached two quadrature optical encoders to the wheel of the mobile robot. I also have imu6050 attached to the breadboard to calculate the orientation of the wheel mobile robot localization. I want ...
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1answer
26 views

Simulating sensor readings based on an existing Alan Variance Analysis

My goal is to model an accelerometer and a gyroscope based on real hardware. I understand deterministic errors like bias and scaling but the different types of non-deterministic errors are difficult. ...
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1answer
396 views

How to determine the rotation matrix and translation vector of a fixed LiDAR from the sensor frame to an aircraft's vehicle frame?

I am using a fixed 3D LiDAR sensor on a small aircraft. The vehicle has a GPS/INU to calculate its own position and orientation. I do not know the exact offset of the LIDAR from the center of the ...
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get position of objects using ir

I originally wanted to make a shoddy vr system with two IMU's in two seperate right and left controllers, which their values could be sent over wifi to the game service unity so I can plot their ...
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3answers
686 views

IR pattern projector

I am currently working on a robotics project in which I wish to integrated a depth/object scanner. Now my focus is currently on an IR camera in combination with some sort of IR pattern projector. ...
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0answers
20 views

Serial communication of IMU and Encoder arduino code

Pls, I need people to help me look at where I am getting it wrong. I test this code on Arduino ide and got the result I wanted but sending it to Matlab through serial communication, I obtained a ...
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0answers
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Raspberry pi 3b+: any recommendarion for a tube wind speed sensor for raspberry

I am looking for a tube wind speed sensor compatible with raspberry pi 3 b+. I found some on internet, but i dont know if they are compatible, most are for flying devices, i will use the sensor for ...
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1answer
40 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 ...
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1answer
80 views

How to compute the field of view of a robot when obstacles are around?

Is there a formula to compute the field of view of a robot when it is obstructed by other objects like in this picture When it is a full circle it should be ...
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2answers
639 views

IMU and encoder fusion

I'm trying to simulate data fusion for a 4-wheeled mobile robot using ekf and am using IMU and wheel encoders as sensors,where IMU measures linear acceleration and angular velocity and encoder ...
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0answers
11 views

Simulation flight gives inconsistent sensor data

I made a short outdoors flight of 10 minutes with hector quadrotor on Ubuntu 16.04 Gazebo 7. The sensor readings and the path images are as attached. The flight was simple. I took of slowly, moved ...
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2answers
61 views

Mapping on Glass Surface

Hi i am building a robot that can travel on a transparent/glass surface but i want to map the whole surface. What is the best Solution for a 2D mapping of a transparent surface? -Is Lidar mapping ...
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1answer
37 views

Sensors to detect targets in low visibility environment

I want to know what type of sensor hardware I need to allow detection of moving targets (20mm - 200mm size range) in heavily murky water, where visibility range of typical camera can be limited to 0.5 ...
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1answer
140 views

Accuracy of 3D scanners in featureless environments

I am trying to 3D reconstruct a room that has been freshly constructed but the walls have not yet been either plastered or painted/wallpapered. So far I have tried using mapping techniques(like rtab ...
0
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1answer
23 views

Ros sensor implementation

From this page, there are lots of sensors to be used in ros robots. http://wiki.ros.org/Sensors but I could not install any of them to the robots in my simulations. For example I want to install ...
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2answers
73 views

Vısual sensor.camera lenses with a field of view of more than 180 degree

What kind of camera models can be used for lenses with a field of view of more than 180 degree ? Is ıt possible if not why? Are fisheye lenses suitable for this purpose?
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1answer
107 views

GraphSLAM data accumulation problem

I try to implement GraphSLAM from this tutorial, The GraphSLAM Algorithm with Applications to Large-Scale Mapping of Urban Structures. I have some doubt while studying this paper. I hope people who ...
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2answers
61 views

Localize a Mobile Robot on a Mirror

I am currently busy with a project which requires me to construct a robot capable of cleaning a heliostat (movable mirror used to redirect sunlight). Heliostats are basically large flat mirrors that ...
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1answer
39 views

Visible light sensors for line follower

I'm making a second version of my line follower robot and I'm thinking what are the line sensors going to look like. In the previous version I've successfully used IR LEDs and IR phototransistors, ...
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0answers
28 views

How to loop various conditions multiple times

I have 2 arrays (s_left and s_right) a length (dis), the arrays in reality are produced from sensor values. The first situation entails looping the condition (s_left < dis) twice and at the same ...
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1answer
55 views

what kind of processing is required on raw IMU data before it is fed into a filter?

Im working on quadcopter. At this stage im coding a reference system for quadcopter using 10DOF board.At this stage im at the point of only getting raw data values from accelerometer, gyroscope, & ...
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2answers
36 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 ...
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2answers
48 views

What does “resolution of a sensor” mean? [closed]

I am studying robotics and I am focusing my attention on the sensors used on robot manipulators. I have seen that there a proprioceptive sensors, such as encoders, and exteroceptive sensors, such as ...
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1answer
48 views

Drone Horizontal Speed Measurement

Assuming no GPS is available, what can be used to measure the horizontal speed of a hypothetical drone? Sensor mass and size don't need to be taken into account. Could small Doppler radars , maybe ...
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0answers
29 views

Google Cartographer: bag validation detects gaps in LIDAR messages

I'm using google cartographer to do SLAM, and I'm experiencing some accuracy issues, in particular my map rotates and gets distorted when the robot rotates. I run ...
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0answers
31 views

How to obtain airspeed data

I want to measure the airspeed on a flying vehicle and get the data with a microcontroller. Note that, there will not be any control mechanism on the flying object, it will be flying mechanicaly/...
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1answer
33 views

Feasibility of SLAM with heterogeneous sensors

Why are there so few published implementations of SLAM with support for heterogeneous sensors? Heterogeneous sensors include LIDAR, monocular cameras, stereo cameras, thermal sensors from more than ...
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4answers
4k views

Detecting the presence of a person in a room

I am working on my first hobby project and I'm not very familiar with sensors yet. I am trying to build a system which detects the presence of a person in a small room with a single entrance/exit door....
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0answers
24 views

Best Sensors/Upgrades for mBots? [closed]

So i have regular mBot with black/white line follower & ultrasonic sensor. What would be the best thing to upgrade it with? Also is there something that is similar to those blue metal rods? I ...
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5answers
509 views

Sensors in Collaborative Robots

I'm currently doing some research on collaborative robotics. One area of interest is the type of sensor(s) used in these kind of machines. I had a look at some robots by FANUC and Universal Robots ...
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1answer
28 views

Sensor options for localization on linear rail

For a thesis project for ways to localize a slide on a linear rail with a length of ~1m. The slide in question is the seat of an indoor rowing machine: Concept2 Ergometer Price is definitely an issue ...
3
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4answers
130 views

Robot detection in motion

In the environment, I have two robots and a couple of fixed obstacles. In order to detect obstacles I am using ultrasonic sensors. For robots, they need to detect each other and from which side other ...
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0answers
46 views

Using CTRV UKF, to predict yaw and yaw_rate without measuring it

I would like to know does it makes sense to use CTRV (constant turn rate & velocity) motion model [x, y, v, yaw, yaw_rate] with Unscented Kalman filter if I have only measurements of the position ...
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3answers
106 views

Understanding the SICK S300 RS422 data output

I'm using a SICK S300 safety scanner connected via RS422 -> USB and I'm trying to decode the lines of data into meaningful values, however looking at the data compared to the Telegram Listing it seems ...
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6answers
4k views

Polling or Timer interrupt?

We hope to build a simple line follower robot and we got a problem when we were discussing about PIC programming. We planed to write a endless loop, check the sensor panel reading and do the relevant ...
8
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4answers
396 views

What kind of sensor do i need for knowing that something is placed at a position?

I have a small device that's picking up small rocks from a pile and moving them to another place. Its a kind of crude way of trying to push the whole pile onto a bigger gear and hoping one of them are ...
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0answers
108 views

How to estimate yaw angle from magnetometer and gyroscope?

I'm using the MPU9250, it measures acceleration, magnetometer, gyro, etc. Complementary filter tutorial for this is here, however this tutorial does not have a magnetometer and I do, thus I thought I ...
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2answers
72 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 ...
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4answers
4k views

Computer vision with single camera vs. distance sensors for obstacle detection [closed]

I am going to start a new project consisting in implementing an autonomous driving RC car. The car as it is now, has a camera installed on each side of the car, i.e. 4 cameras in total. They are ...
1
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1answer
67 views

Joint torque sensor vs end-effector force sensor

I am trying to understand the difference between joint torque sensors, and force sensors, in a robot arm. From what I understand, joint torque sensors estimate the torque at each joint, whereas a ...
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1answer
53 views

Is This A Colour Sensor?

Hi Iam new to robotics and stack exchange and Iam 13 years old,this is a IR sensor, can you tell me that is this thing have a colour sensor on it?
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1answer
43 views

Can drone fly in predefined fixed trajectory without GPS

Is it possible to make a drone to fly in fixed altitude and move in fixed trajectory without GPS. (Drone has to move in fixed path which is already defined). I am saying without GPS because drone has ...
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2answers
60 views

Drone Mapping Project

I'm mapping my college campus with a drone (as part of an approved science project). I want to film, measure the temperature, and take infrared video at the same time. What drones are good for ...
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2answers
59 views

How to handle multi-sensors data [closed]

I am new to sensor data fusion world. I want to find room vacancy using ultrasonic, PIR and sound sensors. These sensors deliver binary information about the occupancy. How can I combine the ...
4
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3answers
2k views

A sensor that can see glass/transparent objects and surfaces

I am currently thinking about making a robot that will autonomously drive around the place. The place I want this robot to drive in however contains quite a few glass walls. When mapping the area I ...

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