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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3k 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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1k 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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232 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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131 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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164 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
236 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
193 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
4k 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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241 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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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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109 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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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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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
241 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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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
551 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
89 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
122 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
309 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
610 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
780 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
1k 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
4k 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 ...
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1answer
541 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
182 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
148 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
3k 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 ...
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1answer
37 views

augmenting room magnetic field for smartphone sensors [closed]

is it possible to enhance (or redirect) the earth's magnetic field in a room or house so that one can write a small program that makes smartphones with hall-effect sensors detect more reliably in ...
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2answers
747 views

Mechanical odometer with digital output

I would like to mechanically measure the distance a kids electric ATV traveled. The ATV will not be used with kids but as a mobile robot instead. It has a common rear axle for both rear wheels which I ...
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1answer
178 views

Shallow underwater wireless sensor network [closed]

I need to make shallow (max 2m) underwater wireless sensor network. Data payload is about 10kB/s. I know that VLF band (~3-30kHz)could be the best solutions for that, but cause of time-to-market I ...
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1answer
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Dead Reckoning: Obtaining Position Estimation from Accelerometer Acceleration Integration

Good day, I have been reading papers about position integration from accelerometer readings. I have consulted this paper from freescale on how that is achievable and this article regarding leaky ...
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1answer
2k views

Counting number of people entering a room [duplicate]

We are making a project in which we want to count the no. of people entering and leaving a room with one single entrance. We are using IR sensors and detectors for this ,along with an Aurdino. We have ...
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1answer
87 views

Building a stationary robot which can talk [closed]

I am a Computer Science major and I only have basic ideas on Robotics. I am planning to build a stationary cubical AI. The main purpose of this bot will be that, it will have a sensor to check if ...
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1answer
814 views

Measure weight of an object using a servo

Assuming a quality industrial servo, would it possible to calculate the weight/resistance of a load? Maybe by comparing current draw in a holding position, or by the time it takes to lift/lower an ...
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1answer
72 views

Syncing camera with other signals

I am not sure if this is the best place to ask this question, but hopefully someone here can give me some advice. I have a device hooked up to a data acquisition system that can provide sync out ...
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3answers
107 views

Wearable Accelerometor

I've worked with wiimote accelerometer, but I think now I want to move past that. Mostly because I want to have a wider range of available gestures and I think that using only one accelerometer has ...
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1answer
115 views

What kind of sensor I can use to identify which fruit it is (like mango or apple)? [closed]

What kind of sensor I can use to identify which fruit it is (like mango or apple). Moreover, is there any sensor to identify different varieties of apples or mangoes.
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499 views

How does the cliff sensors on ROOMBA work through a glass wall?

I want to use IR sensors to detect whether my dustbin is full but I want to protect it from outside dust. I am planning to use the IR sensors on Roomba. How are they working despite a plastic wall? ...
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2answers
281 views

Do walking robots use accelerometers?

My understanding of walking robots (e.g. https://www.youtube.com/watch?v=xJlkBBdyBYI) is that they use a gyroscope to determine the current orientation of the robot, or each joint of the robot. This ...
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2answers
350 views

iRobot Create 2 IR bump light sensor specifications

Can someone tell me where can I find some specifications about the iRobot Create 2 IR bump light sensors? We have an SDF model of the Create 2 that uses the Hoyuko laser range finder sensor and we ...
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2answers
249 views

Crock Pot Knob Turner

I have a Crock Pot with an analog knob and would like to find a way to turn the knob by using and appliance timer. I have no idea where to begin. I need help. Thanks
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1answer
122 views

Best strategy for area scanning using little sensing bots

I'm currently working on a school project about simulating robots scanning an area, but it has been a struggle to find what strategy the robots should use. Here are the details: I am given a certain ...
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1answer
182 views

How can I detect ground collision, for an hexapod robot?

I'm planning to build a small (probably around 30 centimeters in diameter, at rest) hexapod robot, but, currently, it would only be able to walk on even ground. To improve this, I would have to, ...
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4answers
2k views

Quadrocopter first build: how to tell if components play well together?

I'm building my first quadrocopter, and I'm trying to come up with a parts list that is suitable for a first build. I will use this to learn how to fly a quadrocopter manually (lots of crashes!), ...
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3answers
1k views

How to have a 'Auto Go Home' feature, like the DJI Phantom 3, on a project built quadcopter?

What should a quadcopter have, or have access to, in order to make this 'return home' feature work? Is GPS enough? What is the approach needed to make this happen? I used a Arduino Mega 2560 with IMU ...
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3answers
279 views

Discontinuity in device orientation

Why is there a discontinuity in the quaternion representation of my device orientation? I'm using a SENtral+PNI RM3100+ST LSM330 to track orientation. I performed the following test: Place the ...
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3answers
350 views

Detect polyethylene

First of all, I am in high school[to tell you that I am a newbie and lack knowledge] What I want to achieve for now is a thing that can differentiate between poly bags[polyethylene] and other stuffs. ...
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1answer
512 views

Color sensor alternatives [closed]

I am making a white line follower. I am using an IR sensor module based on TCRT5000. I am directly taking the 8bit ADC reading from Arduino Uno and printing the values on serial monitor. I observe ...

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