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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How to spatially calibrate two FLIR thermal SC8000 cameras?

I have two FLIR SC8000 cameras and I do not know how to spatially calibrate them? I am doing stereo videography of a deformable moving object in a 1mx1m square. I also don't know what angle of these ...
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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 ...
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Barometer altitude calculation

I want to calculate altitude using a barometer which is mounted in the proximity of a number of components which get quite hot and raise the localised temperature. The barometric pressure equation is ...
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Detection of linear acceleration vs rotational velocity/acceleration

I am wondering, how do you differentiate between linear acceleration and rotational velocity and acceleration for IMU? A rotational velocity or acceleration will still appear to the accelerometer as a ...
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For a quadcopter do i need to place the gyroscope sensor at the center of mass?

I am trying to build a quadcopter and think it is essential to have its center of mass in the middle. Therefore, I am planning on putting the battery in the center. However, this will cause me to ...
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How to get a outdoor-camera wired at a distance >4m reliably? [duplicate]

I am working on a autonomous navigation robot that uses some RGB (or RGBD camera, if we find a cheap one), wired at its arm, which is at a distance of 4-5m. Now, the options that I have found are GMSL ...
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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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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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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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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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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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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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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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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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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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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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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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56 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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33 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 the ...
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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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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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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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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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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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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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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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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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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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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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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 ...
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131 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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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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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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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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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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54 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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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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63 views

How to handle multi-sensors data? [closed]

I am new to the 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 ...
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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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Sensor complement in Drone

I saw a question posted by @Rocketmagnet (Why do I need a Kalman filter?) about the need for a Kalman filter. In that question, he says he's designing an UAV and lists the following sensors he will ...
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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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1answer
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3D Direction Sensor - Question from a Neuroscientist

I'm posting here on the advice of r/diydrones, who said you're the people to ask. I'm hoping you might be able to help out with a problem i've come across in my research? I'm a Neuroscientist working ...
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43 views

Can a RPI3B+ handle all this?

I am building a robot that needs to accomplish the following tasks: Keep track of 4 quadrotor encoders, each 979.62 CPR @ ~ 500RPM, so ~ 8163.5 counts per second Read from an RPlidar A1M8, giving out ...
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Choosing a position sensor (encoder) and obtaining velocity from it

How do I know how many counts per revolution I need for an encoder for my application? I need to be able to accurately capture a 1000 Hz signal on an input side running from 1-133 rev/sec (60-8000 ...
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How to handle sensor data for a sensor-fusion algorithm

I am implementing the explicit complementary filter(see below) with a 9DOF MEMS sensors (accelerometer, magnetometer and gyroscope) for attitude estimation. Currently, the gyro and accel update rates ...
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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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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 ...
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53 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 ...
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Tracking object in realtime using depth image stream from a RGBD camera

I have an Intel RealSense camera which can stream RGB and depth image. Using those information I want to track an object moving on a table top. More specifically, I want to know position $(x,y)$ and ...
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438 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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