Questions tagged [sensors]

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40 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 ...
2
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0answers
36 views

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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0answers
23 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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0answers
24 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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0answers
17 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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2answers
425 views

how to implement autofocus for video projector

I have a modified pico video projector that I need to add an autofocus to. The focusing ring already has a fast stepper motor added to it. If the focus had to be done on the middle of the projection ...
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0answers
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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0answers
12 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 ...
2
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0answers
59 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 ...
2
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1answer
51 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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0answers
26 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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2answers
5k 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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0answers
17 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 ...
3
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1answer
38 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 ...
5
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2answers
501 views

Seeing through walls and noninvasive structural integrity metrics

Walking into a building, how does one find out where the pipes are, how strong the walls are (currently) and other key structural integrity measures? without breaking walls or utilising harmful-to-...
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2answers
70 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
1
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1answer
1k 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 ...
1
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1answer
130 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 ...
2
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3answers
330 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 ...
1
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1answer
55 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 ...
1
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0answers
46 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 ...
1
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1answer
31 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 ...
24
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3answers
84k views

Calculating pitch, yaw, and roll from mag, acc, and gyro data

I have an Arduino board with a 9 degree of freedom sensor, from which I must determine the pitch, yaw, and roll of the board. Here is an example of one set of data from the 9-DOF sensor: ...
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0answers
20 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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0answers
53 views

Is there a 5% range CO sensor with a response rate higher than 1Hz?

I'm building a portable emission analyser which measures emissions from a tailpipe, to aid in troubleshooting and tuning an engine. For this, I need a $\text{CO}_{2}$ , a $\text{CO}$, and an $\text{O}...
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0answers
68 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 ...
2
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2answers
44 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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2answers
75 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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6answers
12k views

Distance sensors with accuracy of 1 mm?

I am making a device for measurements. I would like to measure the distance within accuracy of 1 mm. Range could be 2 cm to 15 cm . I looked at Proximity Sensors but the readings displayed by these ...
0
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1answer
22 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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0answers
430 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): ...
1
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1answer
151 views

Can LDR acts as a position sensor?

I am currently doing a solar tracker project. Can I use the LDR as position sensor by detecting the sunlight intensity? I mean if light intensity on LDR east is greater than LDR west, the LDR east ...
3
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0answers
25 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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2answers
117 views

What is this device?

So recently I went to Supercomputing 17 conference and picked this from a booth. I would like to know as to what this device is? What's its name? Where to find its documentations? Thanks
0
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1answer
333 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. ...
2
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0answers
40 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 ...
2
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1answer
505 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?
4
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1answer
917 views

Calculating gyro data from accelerometer, pitch, roll and yaw

I am currently collecting accelerometer and attitude data using smartphone sensors. Data is collected at 100Hz over 2.5 seconds. Of which there are 250 accelerometer points and 250 points representing ...
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1answer
1k views

How to increase the sensitivity range of MQ3 Alcohol sensor?

I am using an MQ3 sensor for alcohol detection but the sensing distance is short. Is there any alternative approach or solution to detect alcohol present in air from a longer distance? For example, ...
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0answers
51 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 ...
0
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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 ...
2
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3answers
1k views

How to measure height of water

I am trying to measure the height [level] of the water in a box that goes from -3°C (saltwater) with water and 150°C dry. Objects will be placed inside the box but will not take up the whole area. I ...
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0answers
60 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/...
4
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2answers
319 views

Weight Sensing Problem: Need to detect 10kg load down to milligram accuracy

So I need to build some type of scale where one can place four 600mL beakers on it and measure out its weight down to a milligram level of accuracy. I'm doing this so I can dose a very small amount of ...
3
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3answers
3k views

Send sensor signals to WiFi network

I want to build a home automation system by hooking up various sensors (e.g., passive IR motion sensors, magnetic door contact switches, vibration detectors, etc.) around the house to detect things ...
2
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2answers
46 views

Are there general-purpose acoustic FFT sensors for plant diagnostics?

For the purpose of detecting a defect or failure in a machine, it is often practical to physically listen to any abnormal noises that a machine might be making, and even use a simple stopwatch to ...
0
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2answers
69 views

Is there a way to determine the colour information of light emitted from an LED?

Say you have an LED light that emits green light. Are there sensors out there that could accurately determine the colour information of the green light? Such as the relative values of red, blue and ...
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3answers
5k views

Can I use a ultrasound sensor to measure water level?

If I use an ultrasonic sensor will it detect the water level? I was thinking about a product to read water level on water boxes (common in Brazil). I researched about instrumentation for this ...
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1answer
45 views

Would it be physically possible for rotating tank armor to move in front of an incoming projectile fast enough to intercept? [closed]

The core challenge of building a tank is deciding where to focus its armor and how much speed / cost you're willing to trade for protection, so this got me thinking, with modern detection technology, ...
0
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1answer
59 views

Low power, large weight sensor needed

I am looking for a weight sensor which has a range from 2000 kg to 30000 kg to measure the weight of passing trucks. Accuracy is not very important. Power use is very important, typically 3.3v. Do ...