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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3answers
538 views

Are there surface texture sensors for integration in circuits?

I have a project in mind for a robot which is able to recognize surfaces, and thought about including the following sensors: a temperature sensor a colour sensor, or a complex of electronic ...
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187 views

Arduino Lightsensor Blocking Code

I have a GY-31 Light sensor and I am trying to make a skittle sorting machine. There is a little wheel skittles can drop into then they are turn to 90 degrees read by the light sensor then dropped out ...
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Can I make an automatically-parking robot car with IR sensor?

It would be easy to understand if you imagine a robotic vacuum cleaner. (For some models) It goes back to a specific place automatically to recharge. Like this, I want to make a robot which ...
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138 views

control a robot with pymorse on MORSE simulator question

I am new to Morse and robotics. This code control the robot by giving the linear and angular velocity. This is the scene description ...
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4answers
3k views

Robot docking for self-recharging

I want to build a simple obstacle avoider robot, but this time I want it to be self-recharging so I am building a dock for this purpose, so I want it to be able to locate the dock and go for it when ...
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2answers
317 views

Is there an advantage to multiple magnetometers for heading computation

I'm building an autonomous sail boat (ripped out the guts of an RC sail boat and replaced with my own mainboard etc.) The controller board I have can accommodate both an MPU9150 and an HMC5883. Is ...
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3answers
34k views

How to estimate yaw angle from tri-axis accelerometer and gyroscope

I would like to estimate the yaw angle from accelerometer and gyroscope data. For roll and pitch estimate I've used the following trigonometric equations: ...
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1answer
78 views

Where do roboticists look for used sensors/hardware? [closed]

I recently built a self-driving vehicle-type robot for a competition, and am looking to sell sensors (GPS, INS, etc.) used in order to have money for the next project. Is ebay where people tend to go ...
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1answer
253 views

Is increasing gyro , accelerometer sensor range is good or bad ? how does it affect the accuracy

I've been using mpu6050 IMU unit ( gyro + accelerometer ) I found that I can set acc range to +/- 2g or 4g till 16 g and same for gyro +/- 250 deg/sec , 500 deg/sec and so I know that they are ...
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3answers
750 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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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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What are the calculations for a badminton robot and mechanisms?

I am designing a badminton robot but i am very confused about mechanisms needed for a badminton robot and various calculations needed for millisecond response.I am also confused about calculations ...
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182 views

Can we use this line sensor as a proximity sensor?

I have an RSL Line Sensor which is designed to distinguish black and white lines. It detects white surface and gives me digital 1 as output, with 0 in case of black, but the surface needs to be close ...
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1answer
741 views

Yaw angle calculation for drone PID from two distance sensors

I'm building a control system with a Parrot AR 2.0 drone where I have access to thrust controls for up/down (z), left/right (y), forward/backwards (x), turn left and turn right (yaw) through a Ruby ...
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Can active sensor data be fed into an Autodesk Inventor Simulation?

I'd like to drive the position of various components within a virtual assembly based on sensor data being collected in real time from an external device. Does Inventor support such a setup? The goal ...
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3answers
125 views

Controlling a system with delayed measurements

Assume I have a rather simple system I want to control, but all sensor measurements exhibit considerable time delay, i.e.: $z_t = h(x_{(t-d)}) \neq h(x_t)$ With my limited knowledge about control, ...
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1answer
127 views

Typical method for integrating a neural net into a PLC

How would one typically integrate a neural network into an online automation system? As an example, we have developed a neural network that predicts a difficult to measure variable within a reactor ...
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1answer
261 views

innovation step ekf localization?

Let's say we have a bunch of observations $z^{i}$ from sensor and we have a map in which we can get the predicted measurements $\hat{z}^{i}$ for landmarks. In EKF localization in correction step, ...
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1answer
121 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
502 views

Solutions for Finding Position and Heading in a Multi-Level House

I was wondering if you could reccomend possible solutions for locating a robot within a multilevel house. What seems obvious to me is that need an altitude sensor to derive the story the robot, and a ...
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4answers
149 views

Why linkage-based haptic devices are much more common than cable (tension)-based ones?

According not only to this link, but in my humble opinion to common sense as well, cable-based haptic devices have got lower inertia and are less complicated mechanically. I also believe that ...
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2answers
897 views

Connect sensors to beaglebone/arduino in a complex robot

I'm building the biggest robot I've ever done. The hardware I have so far is as follows: HCR-Platform from DFRobot as a base x2 12V 146Rpm DC motor with two phase hall encoder x7 Sharp 2Y0A21 IR ...
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Simplest way to do object tracking with a 2D range finder sensor? [closed]

My current class assignment is to program a robot through a course that includes two moving obstacles – other robots moving at constant speed around a region the one robot must get to. Since the other ...
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2answers
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How to get prevent twisting of cables

I am planning to create a motor turret described in this question. But to simplify the problem, I'm thinking of a wind turbine with a generator in the main head that can rotate freely through 360 ...
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1answer
410 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 ...
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3answers
550 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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3answers
326 views

Position and Object Data Tracking [closed]

For a class project, I'm working with a weight stack: I'm trying to simultaneously measure: the position of a moving weight stack the value of the weight based on a calibrated/preloaded position in ...
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2answers
1k views

Datasheet for Taos TCS3200 GY-31 [closed]

Can someone please post the datasheet for the colour sensor mentioned above. All i can find is for TCS3200
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4answers
2k views

How to turn a rover 90 degrees using wheel encoders?

I have a four wheel DC rover with two optical wheel encoders. I'm executing rover turns by controlling the direction of wheel motion on either side of the rover. To turn left, all wheels on the left ...
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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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1answer
81 views

What different sensing approaches are used in the current batch of indoor 3D cameras?

I'm aware of the PrimeSense camera powering the Kinect. Are more advanced sensor types available now in the < $500 range? For example, has there been any sort of game-changer in structured light ...
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1answer
79 views

What's a good pose estimation method for high precision (<5mm per-axis) solutions at short range (<50cm)?

I'm trying to get a 6DOF pose solution for an object that'll be between 10 and 50 cm from a fixed point. I want to avoid putting too much special hardware on the object, but extra hardware on the ...
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2answers
417 views

How to implement a distance proximity sensor with wider range

More in the line of robotics observing their environment, I'm trying to implement a proximity sensor that can sense objects in front of it to a least up to $-30^ \circ \space$ to $\space+30^ \circ $ ...
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1answer
1k views

Multiple position estimates fusion

I have a system in which I have two separate subsystems for estimating robot positions. First subsystem is composed of 3 cameras which are used for detecting markers the robot is carrying and which ...
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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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2answers
78 views

Could piezoelectric sensors be crushed?

I have found some load sensors (piezoelectric) that measure relatively small weights (on the order of ~ grams). That's what I need! However... Around my robot, there will occasionally be bursts of ...
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2answers
327 views

Quadrocopter build - Do these parts look fine?

I am completely brand new to quadrocopter building. I am currently about to start building a Quad. I have done a little bit of research and was thinking of buying the following parts: KK2.1 Hobbyking ...
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2answers
249 views

Software libraries for parsing sensor data

What software libraries are there for assisting the general problem of parsing a stream of sensor data? We use various sensors like LIDARs and GPSINS units that provide messages in proprietary binary ...
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3answers
1k views

Reading data from D+ and D- pins of a USB

So I have this optical mouse with me, which has a PAN3504DL-TJ optical sensor. It has a USB interface and when I looked up the internet, all I could find was tutorials using A2501 or sensors in those ...
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2answers
224 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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1answer
68 views

How to use TOA (Time Of Arrival) to measure 3-axis location of a wireless device? [closed]

I need to read the location of my device within a 1m radius sphere, with accuracy of 5-10cm. The device is handheld and wireless, and currently communicates using a Bluetooth v4 chip. I could add an ...
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6answers
1k views

How to measure displacement, cheaply and without using an accelerometer?

Motion is known to be confined in a sphere with radius of about 0.5m, and resolution doesn't have to be very high (5cm is enough). The device will actually be incorporated in a toy designed for kids. ...
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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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0answers
784 views

Alternatives to Primesense depth cameras? [closed]

I'm looking for low-cost depth cameras (less than 1000 USD) with a range of more than 3 meters. Currently, I have found only SoftKinetic DS-311 that meets these requirements. Here are some other ...
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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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1answer
728 views

Electronic noses for detecting dog urine

I have very limited experience with sensors or robotic components at all, and I hope you will excuse the lack of detail in this Question. I want to set up posts around my yard with electronic noses ...
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1answer
5k views

How do ultrasonic range finders detect objects at an angle?

As far as I can tell, an ultrasonic rangefinder works by reflecting inaudible soundwaves off of objects and timing their return. But if the object has a flat surface and is angled with respect to the ...
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2answers
153 views

problem with simulated sensor in Matlab?

I'm simulating a sensor in 3D. The sensor should determine ($p, \theta, \phi$) from the origin where $\theta$ is the rotation about z-axis and $\phi$ is the rotation about x-axis. The sensor is given ...
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1answer
953 views

Tracking 2D positioning with IMU Sensor [duplicate]

I am using a miniature car and I want to estimate the position. We can not use GPS modules and most of the tracking systems that I saw, are using IMU senson with the GPS module. In our car we are able ...
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3answers
2k views

System for determining occupied seats in an auditorium [closed]

I need an app that can do live monitoring of whether each seat in an auditorium is occupied, so visitors can load the app and see where to sit. The auditorium has a relatively flat ceiling 4m ...