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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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Force sensor that measures position and force along multiple different points

I am looking for a force sensor that is able to measure the position and force along different points of the sensor simultaneously. For example, I would like to measure the position and force of 3 ...
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1answer
32 views

Transformation matrix between a 2D and a 3D coordinate system

I have 2 sensors : one has 2D coordinate system and the other has a 3D coordinate system (not same origin). Knowing the positions of some corresponding target points (used as fixed reference) in both ...
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Do mass or density sensors exist that work from 10 feet away?

I'm working on a project that involves detecting objects that are frequently hidden by foliage. These objects have a very different mass and density than the foliage or branches that might be ...
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1answer
49 views

Noisy magnetometer data

I’m looking to develop an AHRS for which I’m using a magnetometer to correct for heading errors. I wanted to check that the magnetometer I'm using is functioning to the level of accuracy (+- 1 degree) ...
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1answer
18 views

time to Initialise or start sensor after power given [closed]

I am working on a time critical project. I use an optical sensor. I would like to know the initialisation or boot time the sensor after power given which will be in µS. How could I measure that?
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68 views

Magnetometer Calibration

I'm looking at using a magnetometer in a project and I'm struggling to understand the proper procedure for calibration of the sensor. I understand that magnetometers need to be calibrated to ...
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1answer
39 views

project to create a lighter wall [duplicate]

We are working in a project to help blind people cross the street alone .so ,Can I create a Virtual reality wall or a holographic 3d one that is visible in the Street and in all day times ?? ( morning ...
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What's the brand of this acoustic speaker whose operation range is 10-100 kHz?

In this paper A fully autonomous terrestrial bat-like acoustic robot - PLOS the robot that is being presented is equipped with an acoustic speaker that can generate 10-100 kHz sound waves. I want to ...
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Detecting and counting the number of junctions

So I am making a robot which is to follow a line. The field has both +(junctions) as well(by the intersection of two lights). I am yet to figure out what exactly is the best way to track the number of ...
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Which sensoring approach is better for Cobots?

Which approach is better for collaborative robots. Have serial elastic actuators in each joint (like in Rethink Sawyer) or have Force Torque sensors in each joint? Or Force-Torque Sensor in the last ...
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1answer
35 views

Robotic Arm Senior Capstone. Electronics/Controls/Sensors Questions

I am a mechanical engineering student currently working on my senior capstone. My team of all MechEs has to build a robotic "arm" where the arm is really just a link/bar of aluminum. The thing we ...
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Calculation of accuracy during dead reckoning based for sensor selection [duplicate]

I am working on a problem in robot tracking, where our main position sensor will be unavailable for up to a second due to its low frequency. That's why we would need to track its 2D-movements (x&y-...
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3answers
56 views

PID and Kalman filters

Both PID and Kalman filters are used extensively in Robotics. I gather, Kalman filters for sensing and PID for control. What is the mathematical, statistical or other relationship between them?
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1answer
35 views

Object detection using ToF sensor

I am making an indoor robot and in order to detect static and dynamic objects I have decided to go with ST VL53L1X ToF proximity sensor, here is the link: https://www.st.com/en/imaging-and-photonics-...
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0answers
13 views

ESP8266 with DS3231 RTC

I want to use external RTC with ESP8266 to hande alarm more accurately. This lib is overwhelming, there is a lot of unnecessary stuff in examples I think. Is there any simple way to set time and ...
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2answers
58 views

Matrix is singular error in GraphSLAM

I have gone through The GraphSLAM Algorithm with Applications to Large-Scale Mapping of Urban Structures. I implemented the code for GraphSLAM. The fundamental formula of GraphSLAM is $$\mu = \Omega^...
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1answer
46 views

Pressure Sensors for Robot Bumper

I'm building an omni-directional robot base and want to add some kind of low-level obstacle detection. The complete robot will have LIDAR and camera for navigation but I'd like to add something at the ...
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2answers
33 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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Actual dimension of Omega in Graph Slam

I have a doubt about GraphSlam Algorithm introduce in this paper. I add a picture to express my doubts (from page 411, 9th in paper): As per my knowledge $\Omega$ is the information matrix. So in ...
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1answer
59 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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3answers
67 views

How can I get the distance from a robot to a beacon?

I'm planning to create a Raspberry Pi robot to map a room. I intend to use a particle filtering algorithm as one of the central points of the project, that will allow me to work out my position ...
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1answer
36 views

How to create a 3D zone which detects the presence of an object?

I feel this is the most appropriate exchange for this question I hope someone could bring some insight into an area I know very little about. I would like to find a way to detect and log the time ...
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3answers
334 views

What's the difference between a sonar and ultrasonic sensor?

After having read the introductions of the Wikipedia articles about "sonar" and "ultrasonic sensor", it is still not clear to me what the differences between the two are. In the context of robotics, ...
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EKF Slam landmark estimation doubt

I am novice in Slam. I want to implement EKF based slam. For that I consider the book PROBABILISTIC ROBOTICS by Sebastian THRUN. ...
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1answer
60 views

Any kind of sensor to detect really fast moving objects with minimum 25 m radius sub 1.000$?

What we are specifically interested in is for our quad-copter to be able to detect and maneuver to avoid (maneuverability is based on our custom algorithms) objects flying towards it with great speeds....
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3answers
200 views

Gyro Yaw Drift Compensation With The Aid of Magnetomer

I'm getting data From an IMU and a Magnetometer synchronously, my roll and pitch drifts are corrected with accelerometer inside IMU and now I have the DCM matrix ...
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0answers
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accessing serial and ethercat devices

I want to, ask is accessing all the serial devices/sensors eg. RS-422, RS-232 done in same way? And also is accessing all the devices in market with ethercat connection can be done in same way? For ...
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2answers
545 views

What is the difference between active and passive sensors?

Apparently, there are active and passive sensors. An infrared proximity sensors should be an active sensor, whereas a gyroscope should be a passive sensor. Why is that the case? In general, what is ...
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1answer
51 views

How can I access the cliff sensors on an iRobot Create 2 via ROS/ Python?

I have an iRobot Create 2 and am currently using the create_autonomy package. Currently, they have cliff sensors as a "planned" feature. I see in the documentation that there are 4 cliff sensors (...
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0answers
35 views

Using hls lfcd lds in conjunction with a motor driver for obsticle avoidance

I have a hls lfcd lds that i am desperately trying to figure out how to integrate into my robot. i found an arduino library for the sensor lidar sensor library Now im trying yo figure out how to get ...
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0answers
17 views

GNSS-aided IMU calibration

I have a physical system that consists of a GNSS receiver and an inertial measurement unit (IMU) with accelerometer and gyroscope. I would like to determine to some level of precision the angular and ...
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2answers
73 views

What are good options for modifying drones?

I'm apart of a group at my University where we would like to build a drone/UAV and constantly add and modify parts on it. We were thinking of using an Arduino or raspberry pi, but we really don't ...
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1answer
55 views

Control geared DC motor based on timing?

According to this video from Khan Academy about electronics of a DVD drive the position of the sled (which moves the reading head) is controlled by a geared DC motor by using only timing and one end-...
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3answers
78 views

How to detect writing on a chalkboard? [closed]

I've got an idea for a simple robot (with an Arduino or something similar) that will play noughts-and-crosses (aka tic-tac-toe) on a chalkboard, so that kids can play against it. It will use a couple ...
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0answers
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Measuring torque of Vex gear shaft - highest accuracy for lowest price [closed]

I am seeking to collect data for my IB Physics IA (internal assessment). My question seeks to establish the relationship between speed and torque by adjusting gear ratios. (I am aware that gear ratios ...
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3answers
251 views

Zero-Point/Home Position/Origin of Absolute Encoder: What is the Proper Name?

I'm writing an academic paper describing the calibration of a system. Part of that system is an absolute rotary encoder measuring the angle of a joint. However, the position at which the encoder gives ...
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1answer
30 views

Finding the manufacturer for a sensor

We're building a smart camera and one of our competitors is using a depth sensor we're interested in using. If we open up the product, is it common to be able to see manufacturer information for ...
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1answer
21 views

Depth cameras with varying illuminations

We realized that depth cameras (IFM) tend to create a lot of noise when exposed in areas with direct sunlight. Are there any approaches to deal with illuminations? Eliminating pixels for instance?
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2answers
73 views

Depth sensing for a pick-and-place robot

I am supposed to design a pick-and-place robot. I have a prismatic joint to go down to a particular depth to pick an object which is located in 2D using computer vision. What is the recommended way to ...
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1answer
41 views

How Do You Program the SR04 Ultrasonic Sensor?

Dear Robotics Community, I am participating in a Robotics tourney that will start in a few weeks. The challenge I signed up for is to deliver and dump ping pong balls to a box. I already have my ...
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1answer
33 views

What kind of sensor do quadcopter uses?

over the last 5 years I had 2 quadcopter as a gift. the first one was basic, manual, I had to manually set the 4 motor speed for it not to crash during take off and I was alway controlling the amount ...
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1answer
197 views

What is the difference between “Sharp Distance Sensors” and “Diffuse Type Sensors” and others?

Searching online I have stumbled across following type of sensors that claim to measure distance. I don't quite understand the difference between them and their pros and cons. Would appreciate if ...
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1answer
47 views

How to set sensor output

can anyone please tell me if the sensor output is 0 to +-10V, and i connnect the sensor to differential amplifier to get an output of 0 to 3.3V then what is the input voltage to differential amplifier ...
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1answer
74 views

Self balancing roboter IMU issue

I build a self-balancing robot, at least that what i should have been. now i have tried implementing a complementary filter which combines gyro and accelerometer data, but the problem is that the ...
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1answer
53 views

How to detect books in a bookshelf? [closed]

I need help converting this project to reality for my office that I currently work in. I basically want to have sensors(idk which or what kind) behind a bookshelf in individual racks and have those ...
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2answers
334 views

Scan an Auditorium, Count People, and Display Open Seats [closed]

I'm looking for any recommended approaches to be able to digitally process a room full people, like an auditorium or a movie theater and output the following information: How many people are in the ...
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2answers
200 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
23 views

How to improve confidence an object is in a particular place

I'm dealing with a problem where sometimes an object I'm looking at using RF signals can appear to be somewhere it's not due to the bouncing of the waves. Currently what I have in place is a circular ...
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1answer
114 views

How do timings affect input, sensor fusion, and output?

I'm programming a quadcopter controller. I've managed to make it fly. But, I'm not sure how to set up the timings schedule for each part of the software. I have several sensors (gyro, accelerometer, ...
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1answer
75 views

Is there a better type of sensor to measure the distance instead of Ultrasonic sensors

We know that the Ultrasonic sensors can't accurately measure the distance to an object that is more than 3 meters away (the distance may vary on brands) has it's reflective surface at a shallow angle ...