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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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 ...
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0answers
140 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
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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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4answers
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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
86 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
55 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
50 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
62 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 ...
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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2answers
33 views

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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1answer
60 views

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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1answer
54 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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2answers
213 views

How do I determine the required encoder resolution for a control system?

I'm designing a joint which will have to move with a velocity of ~60RPM and I have to come up with resolution requirement for the encoders within this joint. I notice however that this is easier said ...
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0answers
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 ...
2
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0answers
117 views

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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0answers
38 views

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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2answers
94 views

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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1answer
96 views

Retrieving distance and angle of roobma create2

The goal of my project is to get a real-time location information of roobma. The information includes the x position, the y position and the angle (12 o'clock direction is 0 degree, 3 o'clock is 90 ...
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0answers
51 views

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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7answers
6k views

What are some low cost alternatives for lidar? [closed]

It need not be as effective as lidar or it may have some disadvantages when compared with lidar. What are the probable alternatives? Edit: I'm intending to use it outdoors for navigation of ...
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1answer
153 views

Why won't my PID line follower work?

I'm trying to implement a PID based line follower. The robot has 2 line sensors with ranges from 0-200, with 0 being black and 200 being white. I'm trying to follow a black line. I'm struggling to ...
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4answers
450 views

Don't understand how sensor works, metal wired directly to I/O pin of arduino

I'm trying to understand how an electronic musical instrument (called an e-chanter) works (imagine a recorder or other wind instrument, but with the holes replaced with metal contacts, and the sound ...
3
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2answers
320 views

Can high voltage power lines provide a super highway for drones?

Is there a way to convert the EM field that surrounds high voltage power lines for direct usable electricity for air or ground drones for continuous flight or travel? Added: Yes could the EM field be ...
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2answers
349 views

How can I detect if a DC motor on a robot is starting to fail?

What characteristics can I look for which could be reliable early warning signs that a DC motor on my robot, say one used for the drive, could be failing? I'm looking for an answer that deals in terms ...
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1answer
102 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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1answer
63 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 ...
5
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1answer
774 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
24 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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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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0answers
132 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
40 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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4answers
23k views

What is the difference between Kinect for Windows and Kinect for XBox?

As I see there is a huge price gap between the two \$223 vs \$99 (at amazon). My intention is to use one of those from Ubuntu linux to perform depth sensing, navigation etc. and naturally I prefer ...
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0answers
124 views

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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2answers
10k views

Altitude hold for quadcopter with Accelerometer and Barometer

I wonder currently how to implement an altitude control for a quadcopter. I have atm just a barometer/GPS and an accelerometer. Barometer and GPS are relatively straight forward implemented, but not ...
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1answer
45 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 ...
2
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1answer
90 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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0answers
6 views

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-...
4
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3answers
2k 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
101 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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3answers
6k 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, ...
0
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3answers
254 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 ...
15
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6answers
29k views

What is the cheapest / easiest way of detecting a person?

I'd like to know if anyone has had success detecting a warm-bodied mammal (ie. Human) using standard off the shelf, inexpensive sensors? Ideally, I'd like to use an inexpensive sensor or ...
3
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1answer
456 views

What approaches should I consider to create rotating a turret

First a bit of background, I am planning to make a highly maneuverable airship controlled by four thrust vectored propellers. I don't want to rely on a rudder and forward momentum for turns but ...
3
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2answers
1k views

Line following robot with EV3 Colour Sensor

I am trying to build an advanced coloured lines following robot with the ability to differentiate between many different coloured lines and follow them. I am looking for the right sensor that will ...
0
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2answers
135 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^...
0
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1answer
40 views

Sensors for identifying stacked books

I am working on a robotics application that involves moving objects (e.g. books) between several (around 10) stacks. To measure the performance, I'd like to be able to measure which book is located on ...
1
vote
1answer
204 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 ...
0
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1answer
66 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....
2
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1answer
631 views

Overview - what skills are needed for sensor fusion?

I want to make a list of what knowledge is necessary for sensor fusion. Since it has a wide array of possible applications, it is not clear where to begin studying. Can we please verify add topics ...
6
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2answers
7k views

Do multiple LIDAR systems in same area interfere?

LIDARs use a pulse of light to measure distance, usually from the time of flight to reflection and back. With a collection of these measurements they can determine their surroundings in two or three ...

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