Questions tagged [sensor]
Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.
2,663
questions
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Removing noise from the speed sensor of a motorcycle
I am trying to create a digital dashboard for a motorcycle using a Raspberry pi, a display and some sensors.
I am using this speed sensor:
https://www.electrokit.com/uploads/productfile/41016/41016412....
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3answers
570 views
LP324N op-amp amplification - why does one circuit work over another?
I have been trying to use an op-amp (LP324N) to amplify a LED that I am using as a photo sensor. The datasheet suggests that a single voltage supply is sufficient, but when Circuit 1 below is used I ...
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1answer
69 views
How to simultaneously measure temperature at different depths?
EDITED - I need to simultaneously measure the temperature of water at different depths. I only have a 10mm diameter access port set at 90 degrees which seems to suggest a 'flexible', cable like ...
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1answer
51 views
Why is the Wheatstone bridge configuration almost always used for sensors over a simple voltage divider? [duplicate]
Everywhere it seems to be taken for granted that a Wheatstone bridge is more precise, accurate etc. I don't see why it would be any better than a voltage divider if I am directly measuring the voltage ...
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20 views
How to design a complementary split ring resonator (CSRR)?
I've been looking for references that could help me to design a CSRR with no success.
Basically, given a desired resonance frenquency, I want do design/calculate a CSRR that meet the needs ...
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1answer
34 views
What is the difference between process value and electrical value?
I have an inductive sensor which measures the movement of a plunger. The plunger feeds with fuel an internal combustion engine. There is an interface where it is shown the movement of the plunger in ...
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1answer
61 views
What microcontroller and other hardware architecture I would need for the following project?
I am making a sensor patch like this to measure the pressure and temperature of skin while a person is wearing certain mask. As depicted in the picture, I would be using a force sensitive resistor ...
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1answer
54 views
Water level sensor giving erratic readings
I am designing a water level sensor using two 2mm graphite rods about 10cm long. I have attached the leads for my schematic to the graphite rods using silver epoxy.
I am using an Arduino Pro Mini pin ...
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2answers
55 views
Best Sensor(s) to Detect Distance to Person Within Range of At Least Several Feet, 360 Degrees [closed]
I am new to electrical engineering, with most of my experience being in programming, so this is an exploratory question in order to determine how feasible it is to do what I want to do.
I am looking ...
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1answer
35 views
Can I power these components with Arduino?
I have 14 x TTP223 touch capacitors, 16 x 3mm transparent blue LEDs, and 2 x s90 servo motors.
I want to power these all. LEDs will probably never be on at the same time but better safe than sorry. ...
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29 views
NEMA17 stepper motor controls according to sensor readings
So im currently trying to use a NEMA17 stepper motor with a A4988 driver. My objective is to control the speed and position of my motor according to sensor readings to position a contraption towards a ...
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2answers
113 views
How can I get a logic output from a temperature sensor?
I need a logic high or logic low output from an LM35. If the temperature exceeds the preset temperature threshold, the logic level output will be generated from the LM35. The preset temperature ...
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1answer
32 views
How to get analog reading from an A3144 Hall sensor?
I once had a Joy-IT KY-024 sensor board that uses the A3141 Hall sensor to output analog and digital signals. I lost that sensor and then bought the Joy-IT KY-003 because I don't need the digital ...
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1answer
28 views
Logarithmic binning of smartphone sensor measurements
I' measuring linear acceleration (acceleration minus gravity) and gyroscope from Android smartphones on three axis (x,y,z). Becuase the distribution of the measurments is exponential, i.e. there are ...
0
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1answer
37 views
how works the BAV99 circuit?
I have a question about the BAV99, I use it for my voltage sensor as a protection for the ADC input but I don't really know how it works. That's why I'm turning to you, to get more information about ...
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33 views
Capacitive touch sensor senses every materials touch
I have a ttp223 capacitive touch sensor. It has three pins, VCC GND and I/O. I left I/O open for test purposes. I connected the VCC to 5V and GND to ground. When I touch the sensor, its led indicator ...
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0answers
25 views
Grove capacitive fingerprint sensor not working
I have just purchased one grove capacitive finger print sensor.
link.
I am using Arduino Nano and followed there tutorial but the example code isn’t working.
Blue light on sensor never turn to green ...
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0answers
47 views
Lipo voltage sensor Arduino
I am making a drone with an Arduino Nano.
To power my brushless motors and my ESC (Electric Speed Controller), I use a Lipo battery which is connected to a PDB (Power Distribution Board).
I did not ...
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1answer
49 views
How to detect collision in a toy car [closed]
I am creating a small car which can change its direction upon collision with a wall or an obstacle. For example, if the car is going north, upon collision it will start going south. I have no idea how ...
0
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1answer
38 views
How wide is IR-led light from VCNL4040?
I have an issue to solve. I'm going to measure an object that looks like this.
My question is if the sensor VCNL4040 have a very wide spread light or very "laser-like" light that ...
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1answer
34 views
How to find out reason for Sonoff SI7021 probe unstable connection?
In my project I have Sonoff TH10 and Sonoff TH16 - allf lashed with Tasmota 9.4.0 and several pcs of SI7021 probes. Problem is that only one SI7021 probe has stable connection, rest are unstable in ...
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0answers
44 views
Magnetometer readings in metal heavy environment
We have designed a sensor board that consist a magnetometer, an accelerometer and a barometer which we are planning to use this on a forklift to get heading information of the vehicle. I have used ...
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1answer
37 views
Using Piecewise functions for LTSpice behavioural voltages
I'm currently designing an analog signal conditioning circuitry for a sensor in SPICE, but I have little time so instead of creating a macro model for that sensor, I will be using behavioral voltages ...
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1answer
31 views
Ultrasonic sensor not detecting any values when using Arduino and LabVIEW
I have connected the circuit as shown.
The circuit works perfectly when I Use the Arduino ide.
When I use LabVIEW, the distance from the ultrasonic sensor is always zero.
The LabVIEW circuit diagram ...
13
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4answers
2k views
Why does it take time for electronic scale to measure?
If I am standing on a digital scale or measuring the weight of my luggage,
the display doesn't show the weight immediately - it takes a few fractions of a second.
Why is that and can you overcome it ...
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0answers
39 views
12 load sensor digital scale?
I have a unique need for a custom, foldable scale and I'm having a tough time narrowing down the components needed. My search on how to get this done has brought me here to this community.
Essentially ...
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18 views
DFROBOT Gravity SEMG sensor component identification
Well, a wire got pulled, and a pin came off.
I have a DFROBOT EMG sensor that has a broken smd component. I need to identify what it is. The picture is shared.
I couldn't find a schematic so from what ...
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1answer
41 views
How to get consistent yaw and pitch angular velocity measurements in a moving frame of reference
I am using a BNO055 sensor with a ESP32 development board to control my mouse cursor. I'm able to get data from the sensor as angular velocity, or as absolute orientation in quaternions and use that ...
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1answer
44 views
Using a 10K ohm thermistor as a 5K
I have a water cooler that is using a B3950 10K sensor.
For energy saving reasons, the microcontroller is limited to 6 degrees celsius (R=24k for the 10k ohm)
I can't modify the microcontroller or how ...
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1answer
52 views
Choosing the values for this magnetostriction oscillator circuit
I'm working with the following magnetostriction oscillator, and I need helping to set the values for L1, C1, L2, and V (my BJT is a 2N2222) such that the length of my iron rod (labeled as ...
37
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10answers
4k views
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 ...
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1answer
44 views
Does using two Hall effect current sensors in parallel affect accuracy?
I am designing a circuit with allegro current sensor ACS770 for measuring currents up to +/- 90A.
I have 2 options :
use single ACS770-100B (100A Bidirectional version)
use dual ACS770-50B in ...
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2answers
57 views
Testing a sensor if it's working [closed]
How can i test if a sensor is working ?
It's a sensor for the refrigerator.
(sensor's specs:
1TW metalflex Tv 433.c 2/250 tf72°c
)
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1answer
45 views
How to interpret the raw temperature value coming from this sensor?
I am using a LIS3DHH. It is an accelerometer but has a temperature sensor inside as well. It is read out using SPI interface. I believe that I have followed the boot sequence properly and am storing ...
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1answer
32 views
LVDT output type concept
Hey all.
I know the concept about LVDT and how it works, but I struggle to understand a minor thing.
why we need the output of LVDT to be DC? is there any specific reason or just because it is easier ...
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2answers
35 views
Determination detection of direction with 2 optic sensors which are on opposite sides of disc
I would like to ask you is it possible to detect the direction of rotation with 2 optic sensors which are on opposite sides of disc? In the disc is small hole, when the part with hole goes through the ...
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0answers
32 views
Calibration of capacitive sensor using AD7746
I bought an Analog Device EVAL-AD7746LDZ water level sensor demo board.
I don't have the complete EB board, so I cannot use their LabView software directly. Anyway, I downloaded it and I'm studying ...
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1answer
32 views
Parallel plate capacitor level sensor
Hey all.
in a typical design of a capacitive sensor for level measurements, compensation capacitors are added as a reference. I struggle to understand why we need a reference capacitance to measure ...
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0answers
20 views
Multiple statuses displayed in LEDs and piezo [sometimes]
Essentially [and this may sound a little overkill] I'd like to run current sensors from three sources to indicate whether electric or EM locks are engaged and to feed off of reed sensors to feed the ...
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3answers
69 views
In cold weather, sensor on garage door opener malfunctions [closed]
I have an electronics question, I hope this is an appropriate forum. I have an electric garage door opener. It works just fine in the summer, but when the weather gets cooler (not below freezing, I ...
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1answer
76 views
Transfer Function of a pressure sensor - what does it tell me?
so I'm trying to get a pressure sensor for a water pump and in the Datasheets they state different transfer functions within the series. I know that the transfer function describes the input and ...
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0answers
39 views
Does creep always occur with load cells, or is there an optimum weight capacity?
I want to make a scale which I will place under a wood stove (downdraft gasifier) to measure the amount of wood that goes into the wood stove. The amount of wood which is being measured will be ...
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0answers
45 views
The role of a transistor in a magnetostrictive oscillator circuit
Could someone please explain the role of the transistor in this circuit?
I have a feeling it has to do with the LC circuit but I'm not sure and don't understand completely.
The following is an image ...
0
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1answer
95 views
I2C slave device address bouncing around [closed]
I am interfacing an SHT20 with a Raspberry Pi via I2C.
In Linux, I am using i2cdetect from the i2c-tools package.
The issue is that I'm expecting to see a static address in this table, but instead I ...
0
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1answer
64 views
Translating 9 - 13mV to \$\mathrm{O_2}\$ level
Output of O2 sensor varies between 9 - 13 mV. For example for this sensor link.
First I thought it 9 mV for %0 and 13 mV for %100 level. After reading this link2, I understood that I was thinking ...
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2answers
78 views
Simulating an Old Vacuum Sensor
I have an old vacuum sensor. This sensor consists of two windings on a coil and a metal shaft that moves according to the ambient pressure and the vacuum level.
The sensor is calibrated at the factory ...
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2answers
70 views
Circuit works in opposite way
I am designing a automatic sanitiser system with IR sensor. Below I have attached the circuit diagram.
But the reality is the DC Pump keeps on running and when IR detects anything the DC Pump stops. ...
0
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1answer
81 views
Interfacing 16x2 LCD to PIC 16F690
I'm designing a digital incubator using a DHT-22 sensor and a 16x2 LCD. I programmed the pic to display my name and the title of my project before displaying the temperature and humidity, but I don't ...
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2answers
74 views
What kind of sensor can sense Infrared radiation from any direction?
I am designing a device that uses a remote control with an infrared emitter and receiver. Originally I designed the device with a Tsop38238 but this sensor seems like it's better suited for a DVD ...
0
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0answers
39 views
LabVIEW outputting incorrect temperature value from TMP36
I connected my TMP36 to my Arduino UNO to A0 and I'm observing the temperature output from LabVIEW. Unfortunately, LabVIEW is giving me an incorrect temperature, with constant readings of around 40°C. ...
