Electrical Engineering

Questions tagged [sensor]

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

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Can W1209 be run with 5V DC only

I would like to control a small heat pad using W1209, using a power bank that provides 5V. My circuit is working if I connect step-up voltage controller to the power bank and increase its voltage ...
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My PIR sensor always has an output even if nothing is infront of it

My pir sensor always gives out an output even if nobody is infront of it. I tried using 3v,1.5v and 9v but sadly the same result. I tried changing it from retriggerable and single trigger. I followed ...
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1answer
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How to Make a Proper Distance of My Social Distancing Alarm Cap for COVID-19?

Here is an Arduino based social distancing alarm cap meant for Covid-19 pandemic or similar disease outbreak. Maintaining the right gap for social or physical distancing is not always feasible. I use ...
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I want to use acoustic sensors to locate an impact on the other side of a half inch piece of wood [closed]

I am currently constructing a project that will require me to be able to locate an object hitting the other side of a piece of wood. I would like to use multiple sensors so that when an object falls ...
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2answers
45 views

How to build AC current sensor circuit for ESP-01 GPIO

I would like to build circuit that can detect current flow and provide suitable digital high signal to GPIO pin for 3.3V ESP-01 logic. I started looking at the designs available on internet. Option ...
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38 views

Arduino IR sensor module does not work on 9V battery with 1kΩ resistor [closed]

I have an Arduino Flying Fish IR sensor module connected to a 1 kΩ resistor that is fed with a 9 V battery. It's a simple connection of just these components. It doesn't seem to work. I'm afraid of ...
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PIR sensor project (LHI778) with Arduino Nano - sensor doesn't react

When I give voltage to the circuit, the LED lights, but the sensor doesn't work. What should I change in the circuit?
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How to measure chlorine content in water using low cost sensor? [closed]

In my project, I need to measure chlorine content in water from the water treatment plant. I searched on google and found some sensors, but the cost of the sensors is too high. I wonder how it's ...
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1answer
27 views

Controlling XL6009 with MCU

I saw XL6009 Link for XL6009, DC DC Converter buck boost converter module. After seeing the circuit diagram XL6009 Circuit diagram, I see the output voltage is controlled by using the Pot over there. ...
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1answer
38 views

Lifespan of underwater sensors

I am researching the lifespan of Arduino sensors underwater. I want to measure the water quality of a lake using an Arduino. I have seen that turbidity, temperature, ph and conductivity sensors don´t ...
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50 views

how to tell if this proximity sensor is NPN or PNP?

I have a proximity sensor without nameplate . I have done some tests that made me think it is a PNP Normally open . is my assumption correct ? is there another method to know ? TEST setup : Supply ...
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Current Sensing IC (MAX9929F) Query

I am using a MAX9929F Current sensing IC and I have a question to someone to may have used it before, or may have some experience with these types of circuits. The circuit I built around the IC is the ...
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32 views

Calculate voltage(sensor weight) to Kg

I want to get weight for load vehicle in Kg, I Used this product and I received like this output '1.361' How I can calculate(convert) this value to Kg(Kilogram)
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What kind of sensors would be best for a fish finder? [closed]

I'm making a fish finder and underwater terrain sensor device. I've heard that ultrasonic sensors do not work very well underwater so at the moment I am hesitant at employing one. I'm also considering ...
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29 views

Arduino FFT on data received from current sensor

I'm working on a project of a predictive maintenance application, where I would like to sample an alternate 50 Hz current by sensors based on the Hall effect (such as ACS712 or any sensors with a ...
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1answer
27 views

Confused about the functioning of a QRE1113 reflectance sensor

First year IT student here. I've been stuck on a problem involving a QRE1113 sensor, in which we were given the schematics below: From my understanding so far, the reflectance sensor is divided into ...
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1answer
44 views

Is measurement uncertainty 2 times standard deviation or 2 times standard error?

Textbooks and online sources often say the industry standard for uncertainty is given at a confidence interval of 95 %. This means out of 100 measurements, 95 would achieve the specified value and ...
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1answer
49 views

How are equations (transfer functions) and the uncertainties for sensors found?

Does anyone have a good: book / link / resource which describes from the ground up how to find an equation / transfer function and the accompanying uncertainties for sensors? I am looking for ...
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2answers
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Why most non-invasive current sensors have a minijack at the other end?

If I search on google for non-invasive current sensor and click on the images tab, in most cases, I see a minijack at the other side of the wire. What is the reason for this? Is this minijack supposed ...
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Which sensor should be used to measure jump height on the beach? [closed]

For a jump height measuring device to have feedback of what training works.
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How to calculate measurement uncertainty of my pressure sensor circuit?

I want to calculate the uncertainty of measurement in force (+/- ...N) of my homemade pressure sensor. The pressure sensor is like an FSR (force sensing resistor) behaving like a variable resistor: ...
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1answer
49 views

Need more than two external interrupts in 8051

I am working with 8 YS-17 flame sensors and may need more in the future. There are only two INT0 and INT1 in port 3. Is there any way to get the other interrupts or I/Os to work as external ...
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1answer
51 views

What is the best way to sense if a climbing hold is being used by a climber?

I am designing a climbing wall game that gets what holds are being used as inputs. I'm currently planning on using a Kinect sensor to tell where hands are relative to holds and capacitive touch ...
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1answer
35 views

ACS 723 Current Sensor

I used an ACS 723 current sensor to measure a very small current. The output of the current sensor gets converted into a proportional voltage. I have attached the output of the current sensor. Could ...
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1answer
31 views

Current drawn by MQ9 Sensor

Here is the datasheet of the MQ9 sensor I would like to be sure about the current drawn by this sensor. The datasheet doesn't say anything about that, but tt says the power Ps heating comsumption is ...
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1answer
109 views

How to calculate measurement error in an exponentially non-linear sensor? (self made pressure sensor)

I'm trying to calculate the measurement error from a home-made pressure sensor which I have in a voltage divider circuit. It has the same negative exponential non-linear resistance characteristics as ...
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51 views

How to transmit sensor data over long distance (30meters) without data loss? [closed]

In my project, I am using ph and 2 more sensors, I need to measure ph level of the liquid and display the ph value, the actual problem begins here, the display and sensors are placed in different ...
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1answer
38 views

Decoupling data fetching from processing and publishing

I am a software developer working on a personal project involving Raspberry Pi, Arduino and accelerometer sensors. I already asked this question in the iot.stackexchange but I haven't had much luck. I ...
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1answer
40 views

Using High side current sensor as a low side current sensor

I have a very small question to ask. Is it ok if a high side current sensor such as the MAX9929 be used as a low-side current sensor as well? Or should I look for some parameter in the datasheet. The ...
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1answer
53 views

How does heater's air-flow sensors work?

I'm trying to deeply understand how the air-flow sensors mounted inside heaters works. They are composed of a U-shaped PCB with an NTC on each end. For example: This PCB is inserted into a tube where ...
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1answer
40 views

Receive bipolar analog signal with sampling rate of 10 kHz

I wish to receive time-stamp data of a bipolar analog signal (analog signal that oscillates about 0 volts) from a sensor (which can only send analog data as an output) into ESP32 at Nyquist sampling ...
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3answers
119 views

AHT10 temperature and humidity sensor does not work anymore

I have used the AHT10 before, I liked it, it worked well. After that I bought new a AHT10 but it is not working with my Arduino. I am using this library. I checked closly, and there is only one small ...
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1answer
52 views

What kind of a sensor is this to detect metal rotating?

I looking for this fat component (brown ) on a PCB: This component using in a textile mill. There is a small metal (buckle) rotating around a disk and this sensor detects whether this small piece of ...
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1answer
38 views

Convert Raw value to voltage in an ADC

An ADC (ADS1015 with n=12 bit resolution) is connected to 5V DC power supply. So its V_ref=5V. However, if I set gain=16, then full-scale-range = +/-0.256V i.e peak to peak voltage= V_pp=2*0.256=0....
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40 views

Wired sensor bus technology

I am working on a project which requires a dozen VL53l0X I2C-TOF sensors to be polled by one master MCU over a few meters of cable. Thus, I decided to accompany each TOF by an Atmega8 acting as a ...
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1answer
49 views

Sensitivity of a sensor

I have a current sensor (sensitivity is 22mV/A) which is being used to measure AC current with its time stamp data. I have connected this sensor to an ADC (12 Bits resolution Can somebody please let ...
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2answers
93 views

Live plant as a touch switch

I’m a Jack of all trades sort of guy but have basically zero electrical knowledge.. That being said.. I want to use a live.. real plant...to turn on and off a light. I tried a touch switch replacement ...
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Non Minimum Phase Systems and Sensor Location

A stable minimum-phase system could potentially turn into a non-minimum-phase system after moving sensors to the AFT (behind) of the CG (Center of Gravity) of the vehicle 1. This is specifically ...
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How to use temperature formula of SI7021 using MS LS recieved

SI7021 datasheet. This is the data in ASCII I recieve to my serial communication in Matlab. The first letter is the ASCII for the MS byte, the second is ASCII for the LS byte, then we have the ...
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1answer
32 views

Wireless sensor network in practical for beginner

I am a master student, and I used to implement my protocol or scheme of WSN in the simulator(e.g., N3S or MATLAB). I am ...
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1answer
42 views

Current loop receiver (minimal implementation)

I'm looking for a minimal design of a current loop receiver with the following characteristics: I_in 0-20mA U_in (-24) 0 - 24V. U_out 0 - 3.3V The precision doesn't need to be very high - an output ...
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Transmission distance with AM2320 temperature and humidity sensor

I'm about to work with a temperature/Humidity sensor, this sensor has to be wired more than 5m and less than 10 m to my PCB board, I was going to use the SHT3xx sensors, these sensors work with I2C ...
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1answer
38 views

Electromagnetic compatibility and external sensors

I have two main questions regarding the electromagnetic compatibility (EMC). If I develop an electronical device and market it in Europe, it needs to be EMC-compliant, right? How come I can buy ...
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1answer
54 views

What is the overall transfer function for this sensor considering its datasheet specs?

I want to read this sensor(MPX4115AP) data accurately but I am not sure about using the given transfer function and the datasheet information good enough. The device is ratio-metric and temperature ...
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1answer
73 views

Arduino ultrasonic sensors in closed spaces

I am wondering whether or not it is possible to use an Arduino ultrasonic sensor in a closed box (30 cm x 30 cm.) I have been told that the walls will cause the signal to bounce all over the place and ...
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I need help in designing an analog front end for a MOSFET based sensor

I'm currently designing an analog front end for an ion sensor (ISFET), the purpose of which is to automatically extend the sensing range of the sensor once the analyte concentration reaches the ...
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Wiring Stepper Motor / Placement of Stepper Motor Driver

I'm making a CNC-like machine and I'm in the process of designing PCBs for the head assembly. Currently I have stepper motor driver (with 100uF caps on the power line) on the head assembly and I'm ...
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The object is to set off an alarm when the flow of water stops or drastically decreases using a Hall effect flow sensor

I have plumbed a flow sensor similar to this in the salt water line on my boat between the sea strainer and the suction pump for engine cooling over a 'salt to fresh water' heat exchanger. When the ...
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1answer
51 views

MLX90614 breakout board dead

I purchased two MLX90614 boards from aliexpress here. They are both higher accuracy ( GY-906 DAA => 0.2°C, 3V) versions for medical instruments. I tried to hook one to Arduino nano (3.3V) but once ...
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46 views

How to improve humidity sensor (Si7021) accuracy?

I am trying to measure humidity in a textile factory more accurately. I found this sensor Si7021 (circuit was copied from SparkFun this is the link from SparkFun.) It is measuring very good. I am ...

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