Questions tagged [sensor]

Sensors convert a physical quantity (e.g. temperature, pressure) into an electrical signal.

Filter by
Sorted by
Tagged with
0
votes
3answers
50 views

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....
3
votes
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
-1
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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. ...
0
votes
0answers
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 ...
1
vote
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
votes
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 ...
2
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
votes
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 ...
0
votes
0answers
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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 ...
0
votes
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 ...
0
votes
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 ) ```
1
vote
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 ...
-1
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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 ...
1
vote
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 ...
1
vote
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 ...
0
votes
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
votes
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
votes
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 ...
0
votes
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 ...
1
vote
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
votes
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 ...
1
vote
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
votes
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. ...

1
2 3 4 5
54