Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [pressure]

98 questions
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How can human finger pressure be measured?

I am dealing with a situation where a patient can only very lightly press his fingers / hand to signal what he / she wants. Speaking or eye tracking is not possible. The person is also not able to lift his hand. The only movement possible is a…
tmighty
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Arduino interface with I2C Pressure Sensor

I have a Honeywell ASDXRRX100PD2A5 I2C Pressure Sensor that I want to read using an Arduino. Looking at the datasheet, I know that the I2C address is 0x28, and I have had a play with bits of code I've found on the internet, but none of them make any…
JosephFTaylor
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What kind of a sensor does a arcade punch (boxing) machine have?

I am working on a project, where I have to measure the pressure exerted by a punch. I am trying to understand how an arcade machine works, and see if I could replicate the same mechanism in my project. Additionally, I would like for the sensor to be…
hegemon8
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LM358 Differential Two Stage Amplifier Misbehaving (unanticipated output voltages)

Hello all and thank you in advance for taking a look at my problem. I have made a circuit which takes a differential voltage from a Wheatstone bridge (pressure transducer) and converts to an analog voltage to be read by an ADC. The first stage of…
Ryan Coleman
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2 answers

How to detect when the lid of a box is loosened (as soon as the screws are unscrewed)?

I have an aluminium box (dimension about 10 × 10 × 10 cm) with a lid closed with 4 screws (such as this: https://www.hammfg.com/electronics/small-case/diecast/1590). I would like to put a simple electronic circuit inside the box with a small battery…
Bau
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Successor of VTI's SCP1000 Family of Absolute Pressure Sensors

VTI's SCP1000 product family is a range of ceramic capacitive pressure sensors that have reached the end of their lifespan. It has been suggested that certain sensors designed by others (like Bosch Sensortec and STMicroelectronics) could be a…
LIGHThouse
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Waterproof pressure sensor

I'm designing an equipment that will be in a rural area exposed to heavy rains. I already got an IP67 rated enclosure with IP67 connectors and it's working as expected. I need to measure the ambient pressure so I found this sensor for the task. The…
Andres
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Calculating SPL from voltage output of a microphone with MAX4466 amplifier

I'm using Electret Microphone Amplifier - MAX4466 with Adjustable Gain and I'm getting the output voltage ranging from 1.5V to 3V (which, to my knowledge, is already amplified by MAX4466). I know that the sensitivity of the microphone is -44dB @…
J.Jay
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Fluid pressure sensor choice

I need to measure change in pressures in the range of 400-600 Pa. The sensors easily available are in the MPa range, for example 1.2 MPa. I was hoping to acquire a sensor in the upper limit of 1 kPa, but it isn't easily available. If I build an…
RocknRoll
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Quad op amp problems

I am using a pressure sensor with my Arduino Uno. Below is the amplification circuit for the sensor. The recommended reference voltage is 1V DC, but I had been using the 3.3 V of Arduino as reference and been getting 206 ADC values at 1 volt dc…
DribbleNibble
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Sound level meter using a microphone with ADC

I'm working with STM32F4, MAX4466 amplifier and a condenser microphone. In other words, Adafruit 1063. I want to get the sound level in dB unit. I know: Microphone sensitivity: 0.0063096 V/Pa Amplifier gain: 41dB Amplifier voltage bias:…
sabruri1
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Questions about capacitive sensing

I'm trying to use the FDC1004 capacitance-to-digital and I have a few questions: Why do we (our fingers or another part of our body) act as the other conductive plate - don't we have a very large resistance? The image below shows the finger…
VanGo
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LED light bulbs in low atmospheric pressure

I have these (https://www.amazon.co.uk/gp/product/B01DBOKZVK/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1) LED lightbulbs. Can I use them in a pressure of ~30kPa (21" Hg vacuum)?
Peter Poláček
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Is the HP206C really so precise?

I'm looking for barometer sensors for use in Arduino projects. One of the items I consider is the HP206C (at Reichelt, Germany). The vendor contradicts himself a little bit when he mentions 0.1 m and 0.01 m accuracy. Therefore I'm trying to look it…
Thomas Weller
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Would a small pressure sensor be orientation dependent?

I'm implementing the BME280 (datasheet here) into one of our systems. My coworker swears that pressure sensors are orientation dependent. I've found from online documentation that this is true for large flow-rate pressure sensors, but I haven't…
MaiSpy
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