Questions tagged [sensors]

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How to design a method to estimate vx=speed in direction of swimming

We have a body that goes underwater (let's say a whale) with magnetometer and accelerometer data. I also have GPS, date, depth, pressure and temperature data. I want to know if there is any simple way ...
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1answer
36 views

What are the simplest available methods for monitoring pressure and airflow in a 22mm diameter pipe?

In the emergency case that more than one person must share a mechanical ventilator, the medical professionals lose per-patient monitoring of pressure and airflow. To that end, what are the simplest ...
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1answer
41 views

How to reduce oscillations (rapid changes of control signal) when controlling a real system, which occur due to noise in measurement from sensors?

I have a real mechanical system (ball & beam) which I want to control. The system is approximated by the second order transfer function: $$ T(s) = \frac{b_0}{s^2+a_1s+a_2} $$ and in state-space ...
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How to get the data from the sensor?

What should I do if I want to connect wahoo cadence sensor (compatible with Bluetooth 4.0 or newer and ANT+ enabled devices) with Oculus Go? If I build an app using Unity on Oculus Go. How to get the ...
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4answers
80 views

What sensors/methods can be used from the roadside to determine if a truck is loaded or empty - without weighing it?

What sensor, using what physical principle, can penetrate a closed rectangular object like the trailer of a truck and tell if the space is empty or loaded? Why is this question relevant? One of the ...
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What is the gel used for covering the strain gauge in the load cell?

We have one imported strain gauge load cell, which shown open circuit in the input impedance. I removed the protective gel and corrected the wiring. Now the load cell is working. But I want to cover ...
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19 views

Moisture sensor for Mixers

I'm looking for alternatives to measure the moisture content in a concrete mixer machine. The ones on the market are expensive, like Hidro-Mix for apparent reasons; mixers are a hostile environment ...
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1answer
37 views

Kalman Filter for Sensor Fusion - What is the advantage?

Is there any meaning of using Kalman Filter for cases when you do not have good statistical model of the system? For example, if you have a drone and it has IMU sensor and GPS sensor. You do not have ...
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0answers
16 views

Accurate distance sensor via soft materials

I'm trying to find a sensor that can measure distance between sensor and some sort of detectable material (metal or small wireless chip) size of no more than a penny. It should be able to measure ...
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18 views

What object characteristics may cause significant distance measurement deviations in Sharp optical sensors?

Not sure if this is the right place to ask this question, but anyways. I'm not very fond of circuits and stuff, but I've got a test question I really need to answer. The question is in the title, ...
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14 views

How to measure rack-like construction structural integrity?

I need to measure structural integrity of quite big rack-like constructions (size of tens of meters, indoor conditions). The construction is already built and the additive sensor and processing system ...
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10 views

Will expanding metal disrupt my motion sensor?

I am trying to install a door motion sensor in a environment that will get very hot for our work. So the door could heat up to temperature of 150-200°F. We built the frames and door to handle the ...
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1answer
49 views

Can a sensor tell the difference between gravity vs. acceleration?

Are the effects of gravity and acceleration identical to the point that no sensor can tell the difference?
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53 views

How to compare two acceleration sensors side-by-side?

I have a single axis analog capacitive acceleration sensor (from PCB Piezotronics) which is very reliable but expensive. Now I need more axis, unfortunately can not afford buying anymore. So I have ...
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26 views

How to connect RFD77402 (sparkfun) proximity sensor to Arduino?

I am currently working with distance sensor (sparkfun) RFD77402, does anyone have experience with this sensor, or know how to connect this sensor with arduino? I'm confused about the wiring honestly ...
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27 views

Can GPS measure speed components?

I know that the RMC sentence contains the 'Speed over the ground in knots'. I'm not sure if this speed data includes the vertical component of the speed, but probably not (this is also a part of my ...
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1answer
30 views

Typical IMU accelerations and angular velocities for lower limbs

Is there a dataset out there right now that shows the typical acceleration and angular velocity values for sensors attached to the thigh, shank, and feet for standard walking? Or literature/textbook ...
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23 views

How to choose order and cut-off frequency for low-pass Butterworth filter?

When using IMU data (accelerations and angular velocities), many papers use a 4th order low-pass butterworth filter with a cutoff frequency of 5 Hz. However, none of them really justify why those ...
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1answer
52 views

Why are FBG sensors recalibrated every 10 years?

So, I am working with FBG sensors and I have read that those sensors need to be re-calibrated every 10 years to get accurate measurements. But no where on the internet (AFAIK) is it explained why ...
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23 views

How do cordless lawn mowers determine lawn density?

Some cordless lawn mowers have a feature that causes the motor to cut off when the mower is rolled over a driveway or over a section of lawn where the grass is very sparse. How does the mower sense ...
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2answers
2k views

What is the difference between washer and O-ring? what is their advantages over the other?

I am designing a hydrophone, from the piezo buzzer. To hold the circular piezo plate, I have designed a mechanical fixture. I need to use washer/o-ring to make it leak-proof. I am confused about which ...
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19 views

How can I confirm nL Volume Measurement for Pump and Sensor Calibration

I'm dispensing around 1uL of volume with 1% accuracy. Although I'm confident in my pump, I'd like to be able to routinely confirm that I'm getting the exact volume I'm requesting every time. How can ...
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15 views

motion gesture and axis definition

I read something about defining hand gesture, which include mid-air hand gesture (e.g a peace sign with the two fingers moving one after another), touch-based gesture (e.g. on touch screen), and ...
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1answer
37 views

What's the most practical way to measure angular velocity for small rotations?

I'm looking to measure the angular velocity of an arm as it moves. It seems to be a difficult thing to research, since the term 'angular velocity/frequency' is usually reserved for other areas of ...
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0answers
36 views

How much does loading a load cell in other directions than the direction it was designed for effect the readings?

I am looking into using this TAL230B miniature type load cell to measure forces in x and y direction. The normal sensor loading is displayed in image 1. What is the effect of loading them as in image ...
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1answer
44 views

How to create a Liquid tight cable seal in a fuel storage tank

I am working on a telemetry system where a liquid level sensor (Hydrostatic pressure sensor) is used to monitor the volume of fuel (gasoline / diesel) in an underground storage tank. The sensor has ...
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2answers
66 views

What is the name and purpose of this Instrumentation / Mechanical fitting

The component I am interested in is the blue "head" in the attached image. I call it the sensor head but will like to know if it has a specific industry name
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2answers
81 views

Activating lights using a motion sensor?

I was wondering how I would configure some sort of setup to get lights like this turn on a timer once activated by a motion sensor. I want them to turn on for about 15 seconds and then turn off once ...
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1answer
32 views

Weight Sensor module needed

I'm looking for a low-power weight sensor which can withstand impacts of up to 1000 pounds. Is there a go-to supplier or brand for this sort of product? I want it to give its output digitally; my end ...
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1answer
58 views

Is there a difference between piezo ceramic disc transducer and a piezo ceramic bender

I really do apologise if this is a stupid question but I for the life of me can't find an answer. I need to do a project where I measure the liquid of water in a tank using ultrasound and am planning ...
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1answer
28 views

Breath Sensor: A low range pressure sensor that won't be affected by humidity

I am designing a device that will measure the force of a breath through a tube. A small differential pressure sensor like this https://www.digikey.ca/product-detail/en/MPX10DP/MPX10DP-ND/464046 would ...
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0answers
19 views

Referencing for Air Quality Monitoring

I asked the same question in electronics sub, but since it is more general I am asking it here again. I bought the Sharp dust sensor GP2Y1010AU0F. Below are the graph of readings indoor for ~5 minutes,...
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339 views

Conversion from LSB to mg not making sense for accelerometer

I have a BMI088 and am trying to get an accelerometer reading. The data sheet and specs for Bosch Sensortec are here: The sensitivity per range is this (its a 16 bit signed integer): ± 3 g: 10920 ...
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2answers
69 views

Compensating for a magnet in a device with a magnetometer

I'm working on a device that relies on data from a magnetometer. Unfortunately, the device also needs to have a fairly powerful magnet on it. Given that the design is fairly flexible, and within ...
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1answer
19 views

Contact Motion Analysis (CMA) [closed]

In this solution Helicoptor Fire Control System CMA is used. For motion analysis we use computer vision and image processing. But what is special about CMA.
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2answers
42 views

Temperature sensor for PI3 thermostat

I’ve been looking for a temperature sensor for my PI3 home thermostat. I’m to the point where my app is stable and running for over 20 days with the only issues relating to the temperature sensors. I ...
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0answers
278 views

Build and visualize Pitch, Roll and Yaw from 9dof data offline

I am trying to build pitch, roll and yaw from sensor readings of a 9 degree of freedom sensing device. The data look like that (in a .csv file): ...
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2answers
57 views

High impact force sensor?

I have a small table-like platform with two legs. Underneath each, I need to measure the amount of force. I want to use the difference between the two force measurements to estimate the platform's ...
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3answers
246 views

What is a Butterworth filter?

What is a Butterworth filter? I have raw X, Y, Z acceleration sensor data that I need to smooth them from noise. I have read that a Butterworth filter is one of the most appropriate for the specific ...
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1answer
267 views

Strain gauge placement to measure a twisting beam

Where is it best to place a strain gauge to measure the twist of a beam? And what type of gauge is best? In my application, I have a small metal part which experiences a twisting and bending force. ...
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1answer
84 views

Which type of sensors to analyze polluting gas from vehicle emissions

I am thinking to develop a remote-sensing applications for vehicle pollutions. In such cases generally expensive optical IR and UV devices are used because more precise. These devices are generally ...
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0answers
39 views

Oxygen sensors in trace gas environments

Do Oxygen lambda sensors (used in automotive applications) work in trace gas environments? My requirements for a trace Oxygen gas sensor: The sensor must be capable of working in an inert gas ...
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1answer
395 views

MQ3 Alcohol sensor

I have done my project on alcohol detection for drivers, but I don't know the minimum and maximum distances between the alcohol sensor and the driver. What are the maximum and minimum distances?
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0answers
33 views

How to calculate slope/tilt from IMU

I have to calculate the slope/tilt from a 6 axis (3D Accelero, 3D Gyro) IMU. Are there open source libraries that help one do this or should I build it on my own? How do I get started? Is there an ...
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0answers
24 views

Predictive object tracking with 2 IMUs and a stereo camera

I am quite new to this so please forgive me for any mistakes. I am working on a simulation project and have very little clue as to what to do and I hope someone can point me to the right direction. ...
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1answer
137 views

What are some robust method to detect or repel lizard?

I am working on a HVAC project where lizard in going inside the electrical unit and causing wire damage and short circuit. I need to find some solution to detect or repel lizard before any ...
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2answers
33 views

What attributes of a surface are relevant to light sensors? [closed]

I'm doing a study on surfaces and I would like to describe all of the surfaces that I expect to encounter in the field and determine which ones will be the most difficult to detect. To do this, I need ...
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0answers
56 views

Could we use NE 555 Timer for industrial magnetic proximity switching circuit?

I actually need a magnetic proximity switching circuit such that In the case of water in fuel sensor, whenever the water level in water in fuel sensor increases the magnetic float shall move and come ...
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1answer
975 views

What is best sensor & method to measure human height?

My application needed to measure human height on a standing kiosk. I need to attach the sensor on kiosk ceiling type top. I used different kind of ultrasonic sensor for this purpose but nothing ...
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0answers
56 views

Commercial electric motor with integrated torque sensor and torque control [closed]

Are there any commercial solutions for electric rotary motors with integrated torque sensor and torque control? I'm only aware of www.sensodrive.de which are essentially the drives used in the DLR/...