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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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1answer
80 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
328 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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0answers
127 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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3answers
2k views

How are color sensors used for line following?

I have to build a line following robot that will be able to detect a selected colored line on the floor and start following it. How do color sensors do this after detecting the specific colored line?
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1answer
53 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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1answer
44 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
373 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
844 views

How can I make a quadcopter avoid obstacles using infrared?

I have a quadcopter built, and I need to be able to make it to autonomously follow a route and avoid obstacles where possible. My general plan is to have an array of sensors on a pre-defined "front". ...
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1answer
84 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 ...
3
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1answer
468 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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2answers
115 views

What is the Name of the part I'm describing

I'm looking for a part that will do a particular function. It has to be able to move along one axis and tell me the force that is being exerted on it. Kind of how like a piston moves inside an ...
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0answers
76 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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1answer
632 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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1answer
113 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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2answers
272 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
11k views

Stereo camera Vs Kinect

Any one can advice me on the ideal perception sensors for pick and place application using a robotic manipulator with ROS support. I have generally looked at things like Kinect and stereo cameras (...
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1answer
153 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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3answers
722 views

Robotc color sensor error

I am trying to write a simple program where the robot(Lego NXT2) will follow a blue line. ...
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2answers
320 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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0answers
391 views

How does one implement a third order complementary filter for estimating altitude using data from an accelerometer and a barometer?

I am working with the CJMCU build of cleanflight on a small drone. As of now, the algorithm for altitude hold uses a first order complementary filter to combine data from the barometer and the ...
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2answers
59 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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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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2answers
810 views

Finding the position of a servo

I am building a collision avoidance system for my robot. As a part of this system I am using a pan and tilt kit (http://www.robotshop.com/en/lynxmotion-pan-and-tilt-kit-aluminium2.html) My aim is ...
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2answers
226 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
130 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
144 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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2answers
223 views

Sensor for tracking relative position of human

I am making a robot that needs to continuously track the relative position of a human, up to 15 meters away and with at least 300 degrees coverage. Currently I am using a Hitechnic IRSeeker v2 sensor ...
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3answers
141 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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3answers
3k views

How to connect ethernet based Hokuyo scanner?

This is a very basic beginner question, I know, but I am having trouble connecting to the Hokuyo UST-10LX sensor and haven't really found much in terms of helpful documentation online. I tried ...
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1answer
203 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
108 views

Dynamically detect changing obstacles

So the idea is that there would be one robot acting as overwatch, which would detect all of the obstacles in an area (which are not necessarily static), and then send the data about the obstacles' ...
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2answers
118 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
69 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
191 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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9answers
14k views

Absolute positioning without GPS

Using an IMU a robot can estimate its current position relative to its starting position, but this incurs error over time. GPS is especially useful for providing position information not biased by ...
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2answers
489 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
88 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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0answers
116 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 ...
3
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2answers
284 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 ...
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3answers
532 views

Differential Drive Robot on uneven surfaces

So I am building a differential drive robot and I want it to autonomously drive in a straight line on an uneven surface. I know I need a position and velocity PID. As of now, I am deciding on which ...
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1answer
651 views

Create 2 Reading Sensor Values

I am trying to solve some Create 2 sensor reading problem that I am having when I came across @NBCKLY's posts (Part 1 and Part 2) that I believe are exactly what I am looking for. I copied his code ...
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1answer
11k views

Send Arduino sensor data to server with GPRS shield

I'm trying to send Arduino sensor data to a server using a GPRS shield (SIM900 shield from Geeetech). I have this particular set up because the data will be updated to a website and the device will be ...
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4answers
747 views

Detect physical touch/hit

I'm making a target to an outdoor robot competition. The target should detect if some of the robot got touched or got an hit automatically. and the target can get hit 360 degree. I'm searching ...
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2answers
3k views

360 degree ultrasonic beacon sensor

Basically, I want to detect an ultrasonic beacon in a radius around the robot. The beacon would have a separate ultrasonic emitter while the robot would have the spinning receiver. Are there any ...
3
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1answer
485 views

Measuring vehicle's forward and lateral acceleration using a smartphone [closed]

I want to measure the acceleration (forward and lateral separately) using an android smartphone device in order to be able to analyse the driving behavior. My approach would be as follows: 1. ...
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1answer
26 views

Locking the yaw direction of a laser pointer

I have a laser pointer on a handle grip and I'm trying to keep the laser pointer's yaw direction, which can rotate at around 10deg/s. So I have the laser pointer on a stepper motor and an ...
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2answers
155 views

Stabilising an inverted pendulum

With the problem of stabilising an inverted pendulum on a cart, it's clear that the cart needs to move toward the side the pendulum leans. But for a given angle $\theta$, how much should the cart move,...
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1answer
128 views

Rotate 3d vector value into a single axis using a rotation quaternion

I want to rotate the whole value of a 3d vector into one axis using quaternion rotations. The reason behind is that I want to align the X and Y Axis of my smartphone with the X and Y Axis of my ...
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1answer
2k views

Instantaneous velocity calculation from accelerometer?

I am trying derive velocity from accelerometer (MPU9250 in sensor-tag board). I saw lot of blogs which talk about noise and exact estimation problems. I started seeing velocity derivation (integration ...