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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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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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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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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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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
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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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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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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
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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
64 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
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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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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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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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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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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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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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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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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
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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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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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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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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
190 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
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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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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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How do I include IR sensors in already made obstacle detection using ultrasonic arduino 4wd robot?

My obstacle detection 4wd arduino robot project is over. Now, i have decided to include few more features to my bot like boundary detection. When googled, i found IR sensors are used. Is it possible ...
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2answers
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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
39 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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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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175 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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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
73 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
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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
275 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
156 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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1answer
111 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
73 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 ...
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1answer
53 views

How do ultrasonic range behave with two objects at differents distance?

If I have the following objects: A and B. A is a distance "Y" from the ultrasonic sense and B is a distance "x". If B is fix and A is moving, does the ultrasonic sense receive and detects A distance?
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Kalman filter localisation equations

I am doing mobile robot localisation as a project. Now I stuck in obtaining the equations of EKF localisation. My robot moves straight for 10 seconds parallel to x-axis and robot equipped with 2 ...
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1answer
401 views

If two ir proximity sensors or two ultrasonic sensors are kept face to face , will they give bad readings for interference?

suppose there are two bots.their task is to detect each other and hit one another(as,i am participating in a sumo-bot competition). but if the two of them are using the same kind of sensors like ...
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1answer
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I’m building a robot.what kind of sensor can find the way home

I’m building a robot by raspberry pi and arduino . I want it can charge automatic.I mean the robot can find the charger station by itself. But I don’t know what kind of sensor can make it true. Wifi ...
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2answers
179 views

How to locate an object on a known surface

I am building a small robot on wheels. The robot will be moving at a small speed in a square area of known dimensions. I need to locate the robot and know its position at any given moment so I can ...
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1answer
269 views

High Res Rotary Encoders [closed]

As part of a project I need an encoder to determine the angle that this, Continuous Rotation Servo - FeeTech FS5103R, has rotated through. The resolution needs to be fairly high as I will be using it ...
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1answer
61 views

.launch file associated while using a sensor

What is the general structure of .launch file for using a sensor? For example: 1.Following code is example for using a JoyStick to control TurtleSim ...
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How can there be a difference in quaternion values of two points taken from sensors where the orientation is exactly same?

I have two situations- A) One, the body with sensor embedded in it kept at rest. B) Second, the body is at rest for 10 secs, then undergoes some movement randomly and comes back to the exact ...
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2answers
588 views

How to convert raw Pitot tube readings to air speed in m/s?

I'm building a kite flying robot, for which I want to measure air speed. So I combined a Pitot tube with an ADC and connected it to my Raspberry Pi using this tutorial. It seems to work perfect, in ...
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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 ...