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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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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
239 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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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
121 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
76 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
61 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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118 views

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
529 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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51 views

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
197 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
322 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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80 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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67 views

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
796 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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1answer
106 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 ...
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1answer
35 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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1answer
43 views

Confused about time systems in ephemeris computation (from GPS subframes)

I am using the gnss-sdr library to compute ephemeris from the GPS message, and to try to make sense of things, I am reading the well-known IS-GPS-200E specification. To compute ephemeris, the time ...
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2answers
241 views

Is it possible that a quadcopter hold height for long time stable only using IMU (without GPS) and barometer?

As we know, we can calculate altitude from barometer readings, and a UAV can hold height by referring to these data. However the real air pressure is varying with many conditions. These variance will ...
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3answers
316 views

Making a robot move straight between two maze walls

Using a PID with encoders, I can make the robot move straight but there is a 0.5 degrees drift and it eventually hits a wall so I need to adjust to center it between the two walls. I have a sensor on ...
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2answers
283 views

GPS message: compute ephemeris data and pseudo-ranges from subframes

I have raw GPS data (see end of the question for details if you think the protocols are relevant), and I need to extract/compute ephemeris and pseudoranges (my goal is to replace the recursive least ...
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1answer
140 views

Why does one IMU axis influence another?

For a home robotics project I just bought a BerryIMU to connect it to my Raspberry Pi. After hooking it up I ran the provided Python code to read out some values while moving it around. If I keep the ...
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1answer
201 views

How can I compensate for pendulum and cart motion when using an accelerometer to detect the tilt angle?

I have an accelerometer mounted to an inverted pendulum (i.e. a cart-pole robot) which I'm using to measure the tilt angle from the vertical upright position (+y direction). If the inverted pendulum ...
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1answer
83 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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2answers
234 views

How to measure pull force on a (kite) rope?

I'm building a kite flying robot, in which I've already got some sensors built in. I now also want to measure the pulling force on the rope which is attached to the kite. So I thought of attaching a ...
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2answers
1k 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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1answer
79 views

Robot end effector sensor query [closed]

I am currently in the process of implementing a Fanuc robotic arm at our company and have just received the pneumatic gripper end effector to go on the end of the arm (which we won't have for about a ...
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1answer
258 views

Simple sensor to detect motion of inanimate objects

This is for a high school project that I'm doing. The sensor should be able to detect the movement of a moving inanimate object and convert into electrical energy, and be fairly cheap to buy. I have ...
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1answer
108 views

What is killing the robots exploring Fukushima?

This article discusses how the robots sent to explore the Fukushima reactors have been damaged by radiation that exceeds 650 sieverts per hour: http://www.theverge.com/2017/2/17/14652274/fukushima-...
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1answer
535 views

Strain gauges or flex sensors

I've been thinking about making myself a fancy data glove. Now that I'm looking into it, I notice a lot of DIY stuff works with these so called flex sensor based on conductive carbon ink. I'm not ...
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3answers
102 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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2answers
260 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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1answer
170 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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2answers
58 views

Is it better to use software or hardware for object sorting?

For a sorting machine where the objects to be sorted have various sizes, color, shapes, and patterns, is it more optimal (in terms of minimal time of the overall process and maximal precision and ...
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212 views

Reading Intention for exoskeletons motion estimation

I'm interested in exoskeletons and wearable rehabilitation robotics. I wonder how we can estimate/predict the intention of human body/part motion. I want to prevent the exoskeleton from interfering ...
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2answers
126 views

How can I compare robot and human hands?

I want a comparison between human hands and robot hands, with respect to grasping and squeezing objects. How can I perform such a comparison, using sensors, as one would with a benchmarking database?...
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0answers
117 views

EtherCAT slave sensor node [closed]

We are currently working on a project where we want to use EtherCAT as a communication protocol between a central system (master) and several nodes (slaves). We want these slaves to have the following:...
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1answer
2k views

How to use registration inputs on a Kinetix servo?

I am working with a Kinetix 5500 servo drive with a rotational actuator to locate a keyway on a shaft. The shaft will rotate, and a laser sensor will detect the height difference when the keyway ...
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3answers
116 views

Appropriate control scheme for gripper end-effector

I want to use a gripper end-effector (3 fingers, single actuator tendon-driven with force sensors in fingers) to grip and hold fragile objects such as an egg. I can not seem to figure out which ...
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1answer
164 views

Use of ADC with Sharp Infrared Sensor

I have a Sharp GP2D12 and I've been using it with my Arduino just fine. I have however had some experience in the past where this sensor (which is analog) was fed into an ADC (like ADC0831) to go to a ...
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2answers
63 views

Is there a sensor that can measure through an object? [closed]

Is there a sensor that can measure through an object, for example a mattress. (This is not what I want to do but it is a good illustration) I want to mount a sensor on the ceiling above the top bunk ...
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2answers
4k 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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2answers
117 views

What microcontroller and parts will work for the robot project described bellow?

I want my robot to contain about 20 MB of data or a little more, this will be mostly in text, some pictures so that it can recognize one or two particular objects. So obviously, I want a camera ...
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0answers
62 views

How to precisely land a copter in a defined place? [closed]

Say, I have a flat square landing place for a copter, made of e.g. aluminium or plastic, with marks on it making a square, looking like this from the top: ...
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1answer
162 views

3 Axis Gimbal Stabilization System can replace with 3 Axis Accelerometer

i have "TAROT ZYX-GS 3-Axis Gimbal Stabilization System ZYX13" sensor that gives me the value of Roll tilt and Pan.The 3 axis accelerometer give me the value of x y and z.so can we use the Gimbal ...
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5answers
825 views

Shield IMU from magnetic interferences

I experienced some drifting when coming near to magnetic fields with my IMU, so I wondered if it is possible to completely shield the IMU from external influences. Would this be theoretically possible ...
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0answers
97 views

Stereo vision for outdoor obstacle detection [closed]

I'm trying to detect obstacles for a distance of up to 10 meters in an outdoor environment. Up to meaning that I also want to be able to detect obstacles that are close to the robot. I am thinking of ...
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2answers
420 views

Is there a portable and accurate sensor to measure the position of the hand relative to the body?

My team has been working on a wearable glove to capture data about hand movements, and use it as a human-computer interface for a variety of applications. One of the major applications is the ...
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2answers
87 views

IR distance sensor

I am trying to make a IR distance sensor. I have seen this online. My goal however is to see the distance between a IR transmitter and my IR sensor. In the example above he uses the IR led's ambient ...
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3answers
332 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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2answers
255 views

Lidar problems in a multi-robot setup

Consider multiple mobile bases driving around in some area. In order to get meaningful data from the lidar of each base, the sensors should be mounted as horizontal as possible. Due to safety ...