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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.

5
votes
1answer
241 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 ...
5
votes
4answers
11k views

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. ...
2
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1answer
193 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), ...
1
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2answers
3k views

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 ...
3
votes
1answer
158 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? ...
7
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5answers
3k views

Polling or Timer interrupt?

We hope to build a simple line follower robot and we got a problem when we were discussing about PIC programming. We planed to write a endless loop, check the sensor panel reading and do the relevant ...
1
vote
0answers
145 views

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, ...
4
votes
2answers
426 views

What is an effective distribution of grayscale sensors on robot

I'm working on a robotics project, and I am using grayscale sensors to automatically follow a black line: turning 90 degrees, going round in a circle, and passing through gaps in the lines etc. I was ...
0
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1answer
763 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 ...
1
vote
0answers
349 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 (...
0
votes
1answer
125 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 ...
5
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2answers
1k views

Accelerometer calibration - how to get cross-axis sensitivities

I've already asked a related question (accelerometer bias removal) here on robotics and got a bit better results on corrected accelerometer output. To get even better results I found the calibration ...
0
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2answers
4k views

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 ...
-2
votes
1answer
322 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 ...
3
votes
3answers
4k views

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 ...
3
votes
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 ...
15
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6answers
28k views

What is the cheapest / easiest way of detecting a person?

I'd like to know if anyone has had success detecting a warm-bodied mammal (ie. Human) using standard off the shelf, inexpensive sensors? Ideally, I'd like to use an inexpensive sensor or ...
2
votes
0answers
250 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 ...
2
votes
1answer
991 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, ...
3
votes
2answers
159 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 ...
9
votes
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,...
5
votes
1answer
10k 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 ...
8
votes
4answers
372 views

What kind of sensor do i need for knowing that something is placed at a position?

I have a small device that's picking up small rocks from a pile and moving them to another place. Its a kind of crude way of trying to push the whole pile onto a bigger gear and hoping one of them are ...
2
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1answer
473 views

Overview - what skills are needed for sensor fusion?

I want to make a list of what knowledge is necessary for sensor fusion. Since it has a wide array of possible applications, it is not clear where to begin studying. Can we please verify add topics ...
12
votes
4answers
6k views

Do magnets affect IMU values?

Im in the process of making a robot which requires 12 3x10mm cylindric magnets for the construction. They are 30mm from the center of the robot where I plan to have the IMU. I was thinking about ...
11
votes
3answers
6k views

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 ...
1
vote
0answers
49 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 ...
10
votes
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 ...
6
votes
4answers
266 views

How to find out how far a motor has taken a vehicle?

I have a small motorized vehicle with gears as wheels running up and down a track made of gear racks. How can this robot know when it has run half the track? And what's the best method to keep it from ...
5
votes
1answer
267 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'...
12
votes
2answers
447 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 ...
38
votes
4answers
21k views

What is the difference between Kinect for Windows and Kinect for XBox?

As I see there is a huge price gap between the two \$223 vs \$99 (at amazon). My intention is to use one of those from Ubuntu linux to perform depth sensing, navigation etc. and naturally I prefer ...
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votes
2answers
5k views

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 ...
3
votes
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 ...
3
votes
1answer
2k views

Kinect - Libfreenect vs OpenNI+SensorKinect [closed]

What are the pros and cons of each? Which is better maintained? Which allows for more functionality? Which utilizes the hardware more efficiently? Etc.
11
votes
1answer
2k views

How can the dynamic effects of motor current on a digital compass be characterized and compensated for?

Digital compasses (magnetometers) require a hard/soft iron calibration in order to be accurate. This compensates for the magnetic disturbances caused by nearby metal objects -- the robot's chassis. (...
10
votes
3answers
153 views

Selecting an accelerometer for Deduced Reckoning

I have never used an accelerometer before, but I am aware that they come with I2C, SPI and analog outputs. If I choose to use an I2c or SPI, device, will I accumulate errors due to communication time? ...
24
votes
2answers
22k views

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 ...
5
votes
6answers
339 views

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 ...
16
votes
1answer
1k views

How does a six-axis force/torque sensor work?

I would really like a six-axis force/torque sensor for my robot, but I just can't afford one. I was thinking about making one of my own. I have experience using strain gauges, but I can't work out ...
23
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9answers
12k 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 ...
10
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2answers
175 views

How to model the noise in a range sensor's return?

Range sensors (for example sonar, infrared, and lidar) are notoriously noisy. How can I characterize the noise characteristics to include these in a probabilistic localization sensor model?
13
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2answers
311 views

How can I detect if a DC motor on a robot is starting to fail?

What characteristics can I look for which could be reliable early warning signs that a DC motor on my robot, say one used for the drive, could be failing? I'm looking for an answer that deals in terms ...