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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13
votes
4answers
7k 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
7k 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
52 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
272 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
275 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
499 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 ...
40
votes
4answers
23k 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 ...
-6
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
3k 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
3k 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. (...
11
votes
3answers
173 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? ...
26
votes
2answers
24k 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
348 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
2k 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
votes
8answers
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 ...
10
votes
2answers
223 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
votes
2answers
338 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 ...

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