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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How to choose WiFi signal strength detecting sensors

We want to create robot that will localize itself by the signals of wifi routers. Which sensors should we buy to detect strength of 3 WiFi signal? Which of following is necessary for us? http://www....
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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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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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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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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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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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Spatial tracking between two UAVs

I have two Unmanned Aerial Vehicles (planes) which work well. They can fly to various waypoints automatically using GPS. Now I would like them to fly together in formation. I would like them to fly ...
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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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79 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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78 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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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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248 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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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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781 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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1answer
138 views

existence probability of an object in fusion

I want to compute an existence probability of an object in a sensor fusion on the high level (having from each sensor list of objects already filtered with e.g. Kalman Filter). There are these ...
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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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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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710 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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941 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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4answers
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Stabilizing a quadcopter with optical flow

My quad copter can balance itself in the air using data collected from mpu6050. With the sonar sensor, it can hover at a specific height, but it moves on the horizontal plane in a random direction. ...
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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 ...
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1answer
86 views

How to gyroscopically measure number of rotations on one axis when there is concurrent random motion on another axis

Can a gyroscopic sensor (comparable to the type that are typically used in smartphones) that is embedded in this black object that is rotating around the X axis measure the number of rotations ...
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1answer
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Is it possible to use HC-SR04 ultrasonic range sensor to indicate thickness of a material

The HC-SR04 is directly connected to an Arduino board with the receiver end(echo) connected to analog pin 2 and the transmitter (trigger) connected to digital pin 4. I am wondering if I can use the ...
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computer aided RC airplane combat

http://www.youtube.com/watch?v=4Vh_R1NlmX0 is from 2011 SWARM and shows RC aircraft or combat wings trying to hit each other in the air. Scoring a hit is pretty rare, and I'd like to increase a ...
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2answers
630 views

Are there any GPS sensors that provide data at 1Hz or faster?

I searched for GPS devices that provide 1 sec updates to server, but I have not found any. I found this T=30s.Module has sent a monitoring data packet. After 12 seconds the server sends an ...
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1answer
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Compiling Code for EY-80

I recently purchased at EY-80 from electrodragon: EY-80 All in one 9-Axis Motion Sensor (Gyro + Acceler + Magneto + Baro) I am having a hard time compiling the example code on my arduino: This is ...
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579 views

1 cm accuracy radio rangefinder?

I need to track a point in space. The point is less than 2 m away, it has to be passive, no batteries, and no charging. I don't always have a line of sight. I need to pinpoint it to about a ...
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3answers
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Stream Real-time Video with Environmental Data Overlaid

I want to embed environmental data collected from sensors into a live video stream from a camera. Has anyone done this or know how I would go about doing something like this? Is there a library ...
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1answer
101 views

Any ideas for a robot? [closed]

I am in the FLL (First Lego League), and while we are waiting for the competitions, we want to work on a robot. Anyone have any ideas?
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1answer
164 views

In SLAM, how does a laser range finder produce pseudo-segments from dynamic objects?

In this paper, the author says that during SLAM process, pseudo segments that appear from any momentary pause of dynamic objects in laser data would make the map unsatisfied. How is this caused? ...
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1answer
252 views

Transducer for underwater applications (passive sonar)

I'm kicking around the idea of building a small passive sonar for an autonomous submarine. I've looked through the net for parts and finding a good transducer for converting the sound underwater into ...
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1answer
197 views

Tiny high torque actuator/sensor design

I need to assemble a small (about 8cm x 5cm x 5cm maximum), actuator with as much torque as I can get at that size. It will be driving a small reel and pulley (reel is ~1.25cm^3, 5mm center diameter), ...
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Laser / photosensor pair or similar [closed]

I'm looking for a laser / photosensor pair (or product of similar function) for detecting when a beam is interrupted (no more than 3ft apart, probably more like 1ft). I'd like these to run off of 5V, ...
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How to control the position of a pneumatic piston?

How can I control the position of a pneumatic piston? The only way I know about is using a magnetic reed switch (magnetic sensor) with a matching piston and use some type of control algorithm, like ...
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1answer
782 views

MPU-6050 + Arduino nano - Logic converter or not? [closed]

I bought this MPU-6050: link According to the manufacture site, the sensor logic level is 3.3V (though the ebay page says Power supply :3-5v) Should I use a 4 ...
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350 views

How to make a motion sensor circuit, that can communicate with my LAN? [closed]

I'm a newbie to Electronics/ Robotics, but I love to do it as a hobby. So I want to build a circuit (a really small in size would be much better) with a motion sensor that can communicate data (...
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How to build a liquid filling machine using piston? [closed]

My team developed a filling machine for liquids which uses a piston to measure and deliver volumes 0.1 to 1 liters into bottles. It is built mostly with mechanical parts and we'd like to replace most ...
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1answer
343 views

automatic sorting with barcode identification inside a refrigerator [closed]

I'm endeavoring to prototype a challenging sorting mechanism inside a fridge and would appreciate any constructive tips on how to get from the specs to a plausible design. Problem The aim of the ...
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0answers
251 views

Building a Autonomous pesticide spraying system using swarm robotics based on odor (volatile Organic Compounds) detection [closed]

Visible worms, pests, and diseased parts of plants emit a unique odor (Volatile Organic compounds with different concentrations). I understand that sensors which can quantitatively detect these ...
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1answer
1k views

Arduino Controlled RC Car. What now? [closed]

I bought an RC car about a year ago. A few days later I integrated an arduino nano into the vehicle. The only thing the arduino does is to receive the RC signal and pass it on to the esc/servo. So, ...
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2answers
164 views

Non-Vision Based Target Tracking

I am building 4-wheeled, knee-high robot with music and speakers on top that will follow a target person as the target moves around. I would like some help with the setup for tracking the target. The ...
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2answers
183 views

Robotics Location Following and Tracking?

I am building a robot that will follow a target as the target moves around. I would like some help with the setup for tracking the target. The most obvious solutions are Ultrasound or Infrared sensors,...
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2answers
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How to fuse linear and angular data from sensors

My team and I are setting up an outdoor robot that has encoders, a commercial-grade IMU, and GPS sensor. The robot has a basic tank drive, so the encoders sufficiently supply ticks from the left and ...
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3answers
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How can I detect the edge of a table?

I'm new to robot making and just got my first arduino to play around. I want to make a robot that will wander on a table, and it will last longer I think if I could make it avoid falling from the ...
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50 views

Force measurement on grab bars [closed]

I recently start a project to measure the force on a bathroom grab bar. The force/load is applied by the person who need to the grab bar for assistant. What I want to measure is the load against the ...
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2answers
1k views

Sonar for obstacle avoidance: how many sensors and where to place them?

For avoiding obstacles during 2D robot navigation what is the best position/angle to place the sonar sensors? How many should there be? I would like to know if there is some theory or examples for ...
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1answer
271 views

Can ultrasonic and button sensors be run in a VEX analog port?

I'm running out of digital ports, and have no sensors that fit the definition 'analog'. Would it be possible to run a touch sensor, a quadrature encoder, or an ultrasonic sensor on an analog port? I'...
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2answers
463 views

What are methods for dealing with compass lag (rate dependent hysteresis)?

I've got a tread-driven robot, with low precision wheel encoders for tracking distance and an electronic compass for determining heading. The compass has significant (> 1 second) lag when the robot ...
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2answers
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Can I make a simple Bluetooth receiver? [closed]

I can control a relay from an Android smartphone using Arduino and Bluetooth as seen here. However, it seems too costly to be using Arduino and a Bluetooth receiver for driving a switch. As long as ...
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1answer
3k views

MMA7361 Accelerometer Always Displays Same Values

I recently purchased a 3-axis accelerometer from Amazon, and can't seem to find how it works. I've been looking for quite a while now, and haven't found any real clues. The x, y, and z values always ...