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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1answer
177 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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941 views

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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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
79 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
696 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
67 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
105 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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3answers
4k views

Detecting the presence of a person in a room

I am working on my first hobby project and I'm not very familiar with sensors yet. I am trying to build a system which detects the presence of a person in a small room with a single entrance/exit door....
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2answers
446 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
272 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
315 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
209 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
114 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
167 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
248 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
306 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
438 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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2answers
2k views

IMU sensor and compensation

Hi I'm using "minImu 9" 9 DOF IMU (gyro, accelerometer and compass) sensor and it gives pitch roll and yaw values with a slope on desktop (no touch, no vibration, steady). Y axis is angle in degree ...
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3answers
2k views

Small IR distance sensor that works on black surfaces

Can anyone recommend an IR distance sensor that works on black surfaces? I'm looking for something to use as a "cliff" sensor, to help a small mobile robot avoid falling down stairs or off a table, ...
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1answer
491 views

What is the easiest and efficient way to detect human in close range distance and make the robot follow it? [closed]

I am having a thesis right now regarding a robot. My research requires the robot to be attached to linear guide rail. A robot has to detect human in a very close range (of about 2 meters distance). ...
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1answer
665 views

Filtering IMU angle discontinuities

I try to measure Euler angles from an IMU, but some discontinuities happens during measurement, even in vibrationless environment, as shown in the images below. Can someone explain which type of ...
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4answers
2k views

Why do 3-axis accelerometers seemingly have a left-handed coordinate system?

Careful inspection of page 35 (figure 58) of the ADXL345 datasheet shows that under gravitational loading only, the chip uses a left-handed coordinate system. My own experiments with this chip ...
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1answer
73 views

Where should I put the angle sensor on my cart-pole robot?

I'm using an accelerometer and gyroscope to detect the angle and tilt rate on my two-wheeled cart-pole robot. Is there an optimal height to place the sensors? Should I place them closer to the ...
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1answer
211 views

“Thermal Imaging” with Arduino and/or Lego Mindstorm NXT 2.0?

I'm trying to build a robot that can be sent into rooms/buildings and detect people using nxt and/or Arduino. In addition to this I would like to be able to view what my robot is "seeing" in real-time ...
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1answer
268 views

Ways to estimate the drift rate of the gyrometer

I found not so much literature to the topic, this is why I ask here. Does someone know some ways to estimate the drift rate of the gyrometer. I was thinking about basically two approaches. One would ...
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2answers
89 views

Aligning datasets with drift

I have a dataset that contains position information from tracking a robot in the environment. The position data comes both from a very accurate optical tracking system (Vicon or similar) and an IMU. I ...
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1answer
264 views

Balancing a plate with an IMU offset from the center

I recently bought a IMU . I am new at this. My question: Does the positioning of the IMU matter? Are there any differences between placing it at the center of the plate or if it is offset from the ...
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0answers
98 views

2D Positioning of mobile robot [closed]

I am just starting to explore an idea and I am somewhat of a novice in robotics. I am looking to position a mobile robot as accurately as possible on a concrete slab. This would be during new ...
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1answer
53 views

IR 40kHz receiver [closed]

These days I'm trying to build IR 40kHz long range receiver. I use ir phototransistor. I don't want to use components like TSOP... I need to make daylight filter and intensify filtred signal because ...
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1answer
573 views

How to calculate vehicle detection distance

I would like to know how to calculate the distance to each car when I run my application for an autonomous vehicle in real time. In addition I want to know how implement the calculation in C++. You ...
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2answers
120 views

Air hockey with a robot as an opponent

I'm not sure if this is the right place to post this but here goes. So, as the title states, I'm planning on building a desk that doubles as an air hockey table which has a robot on the other side. ...
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1answer
297 views

Measuring angular displacement using the TI-SensorTag

I've looked around but can't find the answer, to what I hope is a simple question. I'm working with a TI-SensorTag, and I want to be able measure the rotation around the unit's Z-axis. Basically I ...
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2answers
100 views

Positioning Sensor

I would like to locate the position of a stationary autonomous robot in x-y-z axis relative to a fixed starting point. Could someone suggest sensors that would be suitable for this application? I am ...
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1answer
745 views

Wall following using hokuyo lidar and sharp IR sensors

I have a mobile robot and I would like it to follow the walls of a room. I have: A map of the room. Wheel encoders for the odometry. A Kalman filter for fusing data from wheel encoders and IMU. A ...
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1answer
51 views

recommendation for really high precision attitude measurement sensors

I am new in this field, I am looking for some high precision gyroscopes and accelerometers for attitude measurements.The precision requirement is around 0.2~0.5 deg/s dynamic. I have done some ...
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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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1answer
1k views

Simple Sensor Fusion for pose estimation

I am currently working on a balancing robot project, which features fairly low-cost sensors such as an 9-Dof IMU with the measurement states $\textbf{x}_\text{IMU} = \left[a_x, a_y, a_z, g_x, g_y, ...
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4answers
270 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 ...
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2answers
109 views

Which sensor type most accurately measures position?

We're building an 6dof joystick, and we need to accurately measure the displacement of our central device. We can easily use a mechanical connection to the edges, but there has been some discussion ...
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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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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 ...
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4answers
875 views

How to localise a underwater robot?

I am building an autonomous underwater robot. It will be used in swimming pools. It should be capable of running in any normal sized pool, not just the pool in which I test. So I cannot rely on a ...
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1answer
169 views

Sensors' field of view in car driving

I want to develop an autonomous driving RC car. For detecting obstacles, I plan to mount 3-5 ultrasonic sensors in the front and in the back the car. What is the minimum necessary combined field of ...
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1answer
76 views

Improving Velocity estimation

I have a sensor reduction model which gives me a velocity estimate of a suspension system(velocity 1) . This suspension system estimate velocity is used to calculate another velocity(velocity 2) via ...
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2answers
257 views

Detect human in proximity? [closed]

I'm looking for ways to detect human presense behind walls in close proximity (around 10 feet) in whatever way possible! Problem is I can't code! (I hope it's ok I'm posting here.) I know there are ...
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2answers
181 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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4answers
785 views

What is the cheapest way to detect and identify vehicles entering a gate in real time?

I want to detect and identify each of the vehicles passing through a gate. I have the live video feed of the gate which I initially thought to process and detect the number plates with the help of ...