Questions tagged [sensor]

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

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Concentric Tube Capacitive Fluid Level Sensor Troubles

I'm a mechanical engineering student working on my senior design project. We are trying to measure a fluid level inside a tank using a capacitive sensor. Originally, the team had designed a parallel ...
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2 answers
43 views

First-order filter between sensor and amplifier

I need to sample an analog pressure sensor (TSCDRRN015PDUCV) with very high accuracy. The pressure sensor is currently connected to an instrumentation amplifier (AD623) and then sampled by my MCU's ...
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Can ESP32 node MCU read 5V input?

So I've got a YFS201 sensor which I was using with a Arduino Nano. Now I am employing a ESP32 Node MCU which uses 3.3V logic. I'll be powering the ESP32 with 5V through the Vin pin. I'll be powering ...
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1 answer
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Converting analog values to PPM: MQ135 and MQ131

I am making an air quality monitoring system that makes use of an ESP8266 and an analog extender ADS1115. The main problem is that I get analog values and don't know how to convert them to PPM without ...
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Can't read RGBC data from TCS34725 RGB Sensor using AVR and Atmega16

For my project, I need to read the RGBC data from a TCS34725 RGB Sensor using the Atmega16 and AVR. It should be able to classify between the colors Red, Green, Blue and Clear light. Therefore I made ...
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External synchronization of a AD MEMS acceleration sensor (ADXL355)

sadly, the AD help page was not very helpful therefore I'm posting here with the hope that the collective intelligence here can help me with my problem. I'm struggling with the external ...
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1 answer
43 views

Delay to a MOSFET switching

I have a very simply circuit which, when the sensing lines contact water, switches a relay. The circuit performs well on 12 to 15 VDC. I want to add a delay of approximately 3 seconds to the circuit ...
5 votes
5 answers
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I connected two BJT NPN transistors and don't quite understand how it works

The following configuration is the output of a humidity detector made with one op-amp. The input of this circuit can be 3.3 V or 0 V. When 3.3 V, the red LED should turn on and when 0 V, the green LED ...
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Wheatstone bridge resistance and sensitivity tolerances

A pressure sensor datasheet gives its resistance as 5 kΩ +/- 1 kΩ or 3.5 kΩ +/-0.5 kΩ (optional version). The full-scale output is 150 mV +/- 30 mV at 100 psi, 5 V bridge voltage Vb. The way I imagine ...
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Reading data with ADXL345 only when new data arrives

I am using ADXL345 with Uno and ESP32. I am using ADXL345 with 50 Hz like this : ...
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2 answers
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Read output from Hall-effect sensor VF460S using microcontroller

I have got a few Hall-effect sensors, the VF460S from Honeywell. Now I try to make a circuit using a microcontroller Raspberry Pi Pico to read the output. I have connected V-supply pin to 3v3 gpio, ...
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Using 0-3 V sensor with 0-10 V PLC

I have a sensor that generates an analog 0-3 V output signal. I would like to connect this sensor to a PLC which has only 0-10 V analog inputs. My questions are: Is this recommended to do in general? ...
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11 votes
8 answers
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Detecting stalled AC fan in high-temperature system

The problem: AC 230 VAC fans in a system rated to 100 °C need to be monitored for failure. There is no third wire, just the L and N leads. None of the potential solutions seem good. For example: ...
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1 answer
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Creating a trigger after 555 timer goes from HIGH to LOW [closed]

I've got this part of a circuit that will generate an HIGH pulse for 22 seconds whenever a movement is detected by the SR505 sensor. I would like that whenever the 555 timer goes from HIGH to LOW - ...
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Converting a motion light to USB power [closed]

I have a light that uses 4C batteries and has a motion sensor. I want to convert it to using USB power instead of batteries. Please help me out.
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Contact measurement

I have a mechanical assembly that is to be mated to another surface. To ensure that my assembly is correctly mounted before installation, I have a test piece I insert into it. When everything is OK ...
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1 answer
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How to replace TCRT5000 IR sensor with TCRT1000 IR sensor

I've got a pulse sensing circuit based on the TCRT5000 IR sensor. Its working fine and I can easily see the pulse when finger is placed. But I tried replacing it with the TCRT1000 but there is ...
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1 answer
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Change in direction sensor

Please is there a circuit that if a car travelling in a straight road turns in the opposite direction, a sensor would be able to know and give a signal. The sensor would still be attached to the car
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4 votes
2 answers
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Coupling floating differential inputs to an amplifier with/without resistor pair

My question is about wiring a "floating differential input" signal to an instrumentation amplifier. I've read that in the case of a floating signal two high value resistors are used to ...
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1 answer
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How do I connect the CS pin on an ILPS22QS sensor to enable I2C?

Should I connect the CS pin on an ILPS22QS sensor to enable I2C? In order to enable the I2C interface, on page 25 of the datasheet it says that the CS pin of SPI must be tied high by connecting it to ...
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ADXL345 data_ready interrupt doesn't work [closed]

I am using Arduino UNO with ADXL345. I am trying to implement interrupt instead of using delay. I set the accelerometer's output data rate and I want to interrupt the processor on each data point. I ...
-1 votes
1 answer
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digital display [closed]

I was working on a design question (this is not homework, just personal practice). So I have a temperature sensor with a non-linear response, and ideally I would like to design a digital display ...
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Interfacing temperature system to moving coil

I was working on a design question (this is not homework, just personal practice). Can someone please help me get started or guide me through any worked steps please?
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How to make parallel piezoelectric/PVDF transducers for force measurement?

I am having difficulty in understanding a concept since I am not in the electrical field. I am working on a project to measure the dynamic force on a surface using embedded PVDF transducers. Based on ...
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1 answer
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Using a tilt sensor with NPN transistor

i'm making a fall prevent circuit and i want to make sure that this circuit is correct which i made I would like to check because I don't have enough budget and time to buy many other parts and this ...
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1 answer
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Is it possible to detect linear motion of a billiard cue using a crude potentiometer?

I’m working on a project that simulates the motion of a billiard cue. I’m thinking of using an Arduino Uno for communication and an MPU6050 module for detecting angular rotation. For detecting linear ...
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Does flowing or turbulent air affect gas sensors such as PM2.5 Laser dust sensors and NDIR sensors?

My project is to place a laser dust sensor to detect PM2.5 and an NDIR gas detector on a drone to measure air quality. My understanding is that these sensors work by shining a laser through a channel ...
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2 answers
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A question about measuring light externally from an optical fiber

I know that there are clamp meters to measure currents for electrical wires externally without almost not interfering the circuit. I was wondering whether in the case of an optical fiber(single mode ...
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1 vote
1 answer
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Limiting piezo input voltage without limiting resolution

I realise I am asking what might seem to be a fairly common question here, at least I have found this question online several times, but really never / rarely an answer with some sort of follow-up ...
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2 answers
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Temperature probe calibration

How would you design a replaceable temperature sensor probe such that end users do not have to send the entire unit (processor plus probe) away to be re-calibrated? So that you could just send them a ...
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-2 votes
1 answer
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Electronic Chess Board [closed]

I want to make a chess board that can detect where all of the pieces are and send this information to a computer (Chess.com). I looked into it, and it seems that the best way to do this would be with ...
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1 vote
3 answers
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AD22103 temperature sensor seems to be heating itself up

The picture shows a AD22103 sensor on a prototype board for a room temperature control. The sensor is intended to measure air temperature, not the board temperature. There was originally a ADT7410 ...
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2 answers
76 views

INA229 to measure temperature

I am basically using INA229 to measure current, voltage, power, and temperature of four 12V 100Ah batteries connected in a series-parallel combination. But before I ordered my sensors I read from the ...
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4 answers
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Noisy ADC sampling on NUCLEO-F070RB

I built a circuit on a perf board, see schematic below. Basically, I have an analog sensor where the output is a Wheatstone bridge. I connect this to an instrumental amplifier (AD623ANZ) with a gain ...
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Is there a name for a sensor to linearly output values according to its supply voltage?

The MXA2500E accelerometer outputs values from 0.1 to 4.9 V @ 5 V supply; it outputs values 0.1 to 2.9 V @ 3 V supply. Is there a name for this type of scaling? datasheet
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Why does this 7-in-1 soil sensor print mixed values?

I'm working with a JXCT-IoT seven parameter soil sensor. I did tests to print each parameter and it prints the correct value but when I put in all the code, the values ​​are mixed. For example, the ...
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1 vote
2 answers
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What does sensitivity mean for a current sensor when given in "mV/N" or "mV/mT" rather than "mV/A"?

I have been analyzing various datasheets of current sensors and majorly getting sensitivity given in "mV/A," from which I understand the output voltage per 1 ampere. I do not understand it ...
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How to detect if a sensor is disconnected?

I am currently working on a PCB design. I want to find a way to detect if sensor is not plugged in properly or malfunctioning. For this I want to know how to detect if my load is 0A but I don't know ...
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1 answer
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How to give a "return" value?

I have a circuit. This is what it looks like, made in Proteus. I’m trying to simulate temperature sensor. This is when the simulation is started. When the sim is ended, of course the blue LED is ...
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Understand the values of ADXL345 output by data sheet

I want to make step counter with ADXL345. I got the algorithm but I have a problem with the data sheet and the codes. First of all, I tried the all resolutions. For example if I use 2g my z axes's ...
1 vote
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adding a low fuel light

im wanting to add a low fuel level light to my car. it has a fuel gauge, 33 ohms full 270 ohms empty. the tank has two terminals, one to the body for ground and one directly into the back of the gauge....
1 vote
1 answer
54 views

Measure up to 50um linear displacement with ~100nm accuracy [closed]

I am using some open loop, mechanically amplified piezoelectric (PZT) devices to make linear movements of up to 100um. PZT are well known for hysteresis characteristics thus its repeatability is not ...
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2 votes
3 answers
211 views

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 ...
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2 answers
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In need of some guidance to make this Arduino sensor circuit

These two circuits are given as instructions for the moisture/humidity sensor. Am I suppose to make the one on the left AND the one on the right? The right one seems doable, but the left confuses me: ...
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Daily chain sensors with HIGH/LOW signal output

I'm working with 8 - 16 MTCH101 capacitive proximity sensors connected to one master MCU. Each sensor has a single output pin that is either HIGH or LOW. Is there a general-purpose IC that I can use ...
1 vote
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How to improve instrumentation amplifier circuit?

I´m trying to rebuild a circuit whose schematic I have. I am using a different instrumentation amplifier but the same sensor. Using an oscilloscope at the output and putting the (vibration) sensor on ...
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How to simulate output and noise of a flex sensor?

I am creating a sign language glove. To train the model, I wannat to use a video dataset and simulate the input of the glove. What is the mathematical formula for the output of a flex sensor in a ...
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1 answer
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Fail to read pH value by using pH probe (pH electrode probe E-201-C with its module)

I set up the pH sensor using an ESP32. I connected VCC to 3.3V, GND to GND and PO to PIN39 (ADC1_CH3) and extended my pH probe using four meters of alarm cable. When I do not connect the probe with ...
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How to do a pulse generator whose pulse width is controlled by a voltage measured in proteus without using a microcontroller or an analog circuit?

how are you?. I'm trying to emulate the behavior of the HC-SR04 distance sensor in proteus but using variables. I succesfully could make a simulation of a water tank whose level is indicating by the ...
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Designing a circuit to read in pressure sensor values with minimal analog pin availability

We are trying to build a project which uses an Arduino Nano to obtain pressure sensor readings from 8-10 sensors. The problem we are running into is that the Nano only has 8 analog pins. Of the 8, 2 ...

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