Questions tagged [detection]

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Extending signal duration

I have DMM which is producing pulse with duration of around few microseconds. The pulse need to be sampled in PLC, which has sampling rate of 1ms. In other words the cycle loop can't be reduced to ...
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-3 votes
2 answers
110 views

Is it possible to build radar system for drones detection at home? [closed]

Can I build DIY radar system using ESP32 or Raspberry Pi modules + a bit of soldering that will be able to detect drones in a radius 1-2km? Is it possible? What do I need for this and how much will it ...
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  • 113
2 votes
1 answer
53 views

How to safely protect input sensing AC Line Voltage

I'd like to detect the presence of AC line-level voltages in my PCB project, and I'd like to follow best-practice for doing this. I'm a controls engineer so I'm happy with dealing with mains with ...
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0 votes
0 answers
18 views

Where are power quality disturbance classifiers and detectors useful?

Power quality disturbance (PQD) classification and detections algorithms constitute a decent part of the literature in Electrical Engineering. Where are these classifiers and detectors useful? Grid ...
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0 answers
20 views

Distributed Bayesian Detection with a two sensor tandem topology and unknown parameters

If you don't know the correct keyword, you can still miss a key literature search: I have a problem in distributed Bayesian detection with a serial (or tandem) network topology. The probability ...
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0 votes
1 answer
115 views

How exactly does a breaker finder work?

I've used a breaker finder for a while now, and I'm curious as to how it actually works. The only explanations I can find online are layman explanations (e.g. it sends a signal up from the outlet to ...
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0 votes
1 answer
58 views

Detecting magnets regardless of polarity

I'd like to build large matrix of sensors to detect objects placed on it. I can place magnet or metal inside detected pieces. I tried to use reed switch and hall sensors. Hall sensors seems like ...
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  • 15
0 votes
0 answers
76 views

Problems detecting button pressed when waking up a MCU

I'm designing a device to activate a mechanism when a specific number code is typed on a keytpad. In order to save battery life (it is powered by 3 AA batteries), I have configured the MCU to go to ...
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1 vote
0 answers
26 views

Get alpha-beta plot of Clarke Transform in Python

For a project I'm working on, I want to use the Clarke Transform to detect faults in a power system. To do this, I already wrote a script in Python which returns the sine wave behavior of the Alpha, ...
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3 votes
3 answers
304 views

Difference between a normal tactile switch/pushbutton and a detection switch/pushbutton

What is the general difference between a normal tactile switch/push button and a detection switch/push button? I have heard that if in an application, for example, a pushbutton has to be pressed for a ...
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  • 307
1 vote
1 answer
64 views

Replacing relay for solid state alternative to detect if a connector is plugged in

I'm adding an extra LED light to the trunk of my car stuck to the removable shelf through a magnetic connector (Aux connector). I want the original light not to work if the new light (LED) is plugged ...
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  • 51
0 votes
1 answer
205 views

Cleaning up tacho generator signal triggering false interrupts

I'm currently having trouble with detecting the RPM frequency from a tacho generator signal. I have tried everything I know. My tacho generator is attached to a universal washing machine motor, and it ...
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  • 33
0 votes
2 answers
81 views

Measuring the amplitude of a nV signal of known frequency and phase using AD633

I am wondering if there is a circuit to measure the amplitude of a sinusoidal signal of known frequency and phase that is induced in a pickup coil. The amplitude would be in the range of 0nV to ...
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  • 159
0 votes
1 answer
125 views

Detect if external LED is on from ESP8266

Intermediate DIY-er needs advice. I'm trying to detect if my Air Conditioner power indicator LED is on from ESP8266 microcontroller (Wemos D1 Mini). The indicator LED is on a small PCB module with a ...
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  • 121
1 vote
0 answers
128 views

Converting a PWM signal to reduced constant voltage or constant current output

I'm dealing with an existing circuit that was originally designed to dim incandescent and halogen bulbs from 12V using low frequency PWM. This PWM is visible to the naked eye when substituting a 12V ...
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1 vote
1 answer
124 views

How is this circuit detecting the LED?

so I've just built a circuit and some Arduino code (not shown here) which interfaces between a car steering wheel and its buttons to an aftermarket cruise control system (Command AP500). The stock ...
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  • 11
0 votes
1 answer
220 views

48V Lithium Battery Cutoff Detection Circuit

I'm building a power system using four x 48 V 100 Ah lithium batteries in parallel (48 V 400 Ah nominal). The batteries are already purchased, there is no going back. The cells cannot be accessed, ...
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3 votes
1 answer
172 views

How does a grid-tie solar power inverter know when the mains power has failed?

Solar power inverters that send excess solar power back to the grid are (usually) required to shut down if the grid power fails. (This is to protect people working on the power lines.) The inverter ...
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  • 151
0 votes
1 answer
89 views

Friendly target identification in radar

Crossposted from Signal Processing stack exchange, How do radar systems identify friendly targets to avoid AA locks during combat scenarios? Do friendly planes broadcast a known signal or is something ...
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0 votes
1 answer
55 views

Circuit to detect in which port sensor inserted

I want to build a Counter using a Proximity Sensor. I want to give choice for user to use either PNP or NPN. I will give two ports for the same. I am using PIC16f887 microcontroller. How to detect ...
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  • 229
0 votes
0 answers
386 views

Open circuit fault detection using an Arduino

I was able to implement short circuit fault detection of under ground cables and I was also able to add a GSM module(SIM900D) with it. I'm trying to further enhance my project by detecting open ...
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0 votes
3 answers
149 views

Can LED strips be used as photodetectors?

As I did not find any photodiode/PD strips available, I am wondering if it would be possible to use LED strips as photodetectors. And if yes, which type of LED strip could be used for that purpose? My ...
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  • 13
7 votes
3 answers
878 views

Amplifying 40ns pulses that come at unknown times (for single photon detector)

I have a single photon detector produces a 40ns signal when a photon enters the detector, like the image below: I would like to take this electrical signal and hook it up to this device which simply ...
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0 votes
1 answer
223 views

Reliable 110 & 230V AC line detection on 3.3V GPIO

A manufacturer provided the following circuit, to detect AC line voltage in a small IoT module (non-isolated power supply). SW1 is pulled up with an external 10 kOhm resistor and connected to the ...
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  • 101
0 votes
1 answer
88 views

How to detect AC or DC voltage from 9V DC to 250V AC?

I have a device that needs to detect the presence of voltages from 12V DC up to 240V AC RMS (Absolute maximum of 9V DC to 250V AC RMS) This device is going to have up to 8 channels that should be able ...
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0 votes
2 answers
61 views

How to detect a capacitor installation

The circuit I'm designing uses external capacitor to measure its ESR. I use MSP430 as a controller, capacitance of the external capacitor can vary between 100n and 10uF. The problem is I should ...
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  • 103
1 vote
0 answers
29 views

General approach of signal detection after demodulation of BPSK

I'm very new to electrical engineering. I'm trying to understand the basic approaches/options to detect symbols after demodulation of BPSK. I found some articles mentioning Maximum Likelihood ...
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2 votes
2 answers
80 views

Does the bandwidth at the receiver really affects the noise in digital modulations?

I know that, in a telecommunicacion system, the AWGN power after going through the receiver filter is $$ P_z = KTB $$ where B is the bandwidth of the filter, T is the operating temperature of the ...
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0 votes
0 answers
96 views

How to detect the presence/ absence of a PWM signal on a GPIO pin?

I just want to set or clear a flag by detecting the presence or absence of a PWM signal with approximately >100 kHz frequency on a GPIO pin. I studied that a simple RC low pass filter can be used ...
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0 votes
0 answers
89 views

How to detect an I2C slave presence/ absence as an interrupt?

Involved in a task to build a test equipment with a ARM M4F microcontroller for the purpose of testing various PCBs. One of the PCBs has I2C compatible current/voltage monitoring chip on it. Is there ...
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1 vote
1 answer
61 views

Which sensor should I use to recognize just humans? (not all of the obstacles)

I would like to make a social distance meter and the device should only avoid from humans, not the obstacles. I'll use an ultrasonic sensor and a PIR sensor but I'm not sure it will be enough. Do I ...
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-1 votes
2 answers
153 views

Why can FM be demodulated non-coherently while PM cannot be demodulated non-coherently?

I have read that frequency modulation has the advantage that it can be demodulated non-coherently while phase modulation can only be demodulated coherently. I don't find any reason to support this ...
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2 votes
1 answer
81 views

Why is transformer coupling used in a simple slope detector? Can't the FM signal be applied directly in parallel to a tuned circuit?

This is what I mean by simple slope detector: Why can't it be like:
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0 votes
1 answer
326 views

Is it possible to use a Multimeter for detecting electric leads?

Is it possible to DIY my multimeter into a detector for active wires (charge flowing at that very moment) inside a wall? I don't know, maybe something with a coil or metal plates? The application ...
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  • 103
1 vote
1 answer
67 views

Help recognizing components and parts of this radio telescope [closed]

I stumbled upon this video, where someone is showcasing a radio telescope that detects wifi frequencies and renders them as picture. There are three parts, and the one above is just the 3rd part (last ...
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0 votes
1 answer
132 views

Can a voltage divider be used for (input) jack detection?

I would like to detect when a jack is plugged into my connector. The circuit looks like this: One end of the jack is connected to a speaker, and the other to an audio source, such as a phone or mp3 ...
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  • 125
1 vote
3 answers
142 views

Why the same sound source (low frequency, possibly infrasound) has different frequencies in different rooms of the house?

Can someone explain me why the same sound source has different frequencies in different rooms and if there is some type of correlation between the vibrating frequency and the distance between the ...
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  • 41
0 votes
1 answer
171 views

Composite video from rear car camera - bad signal (wrong levels?)

I have bought a car radio (AMPrime 4022D) that has ability to connect rear camera to it, so you can see the image on its screen. The problem is that radio doesn't detect the signal (blue screen). But ...
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  • 11
0 votes
1 answer
59 views

Detecting when the thermostat turns on the refrigerator

I'm wanting to monitor the power consumption of my Fridge (and Freezer) on a boat where the voltage runs from 12-15.6vDC The Thermostat is an Inkbird(from Amazon) that closes a relay when the ...
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  • 417
1 vote
1 answer
185 views

How to avoid false detection when using IR object detection circuit?

I have a circuit to demodulate 2KHz Infrared pulsed light which is generated by 555 timer IC and its output drives an IR transmitter circuit, which is received by IR receiver located 10 cm apart which ...
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3 votes
3 answers
243 views

How does this surge protection work?

This circuit signals an MCU via OU lead. I am not interested in the MCU side. I just show the concept. My question is very simple: How does the surge protection(actually ı meant detection) part work? ...
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  • 31
0 votes
1 answer
100 views

How to find which landline wires are mine using sensors on my cell phone?

How do I figure out which one is my line? I know there's a special tool for it, some sort of beeping proximity sensor. I don't want to buy any tools. My cell phone, like many, has a Magnetometer. ...
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0 votes
0 answers
234 views

How to design a no-load detection circuit and auto cutoff if load is not presented?

How to design a no-load detection circuit, I couldn’t find a reference design, Is this possible task to perform? Load is an LED setup, 150V DC, 30mA If load is not connected to the circuit, power path ...
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  • 184
0 votes
1 answer
212 views

open wire detection of open drain output

I am working with a commercial dc motor speed controller it has a open drain output which can be used for generating fault signals , i am taking that output to a pcb through wire , i am giving it a ...
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0 votes
1 answer
91 views

Hidden wire detector, using resistor

We have on the collector of the first transistor is a resistor at 1000 ohms , could you tell us what function this resistor performs in this place and how to argue that it is at 1000 ohms
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0 votes
1 answer
259 views

How to detect when an LED has burned out?

I'd like to have a way to detect when a low power LED burns out (2-3.5v, 200-400mA) that is being driven using PWM from a Raspberry Pi with a MOSFET. My understanding is that I would be able to ...
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  • 105
0 votes
2 answers
174 views

Hidden wire detector using BJT transistors

I made a hidden wire detector from this tutorial. It works, but I'm not quite understand why. Here is the circuit: I used 2SC1815 transistors and the value of R ...
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0 votes
1 answer
92 views

How to detect in the code (Not have to design any extra hardware) if a (peripheral) PCB has been inserted/ plugged/ interfaced to the main PCB?

I have a main PCB with a microcontroller on it with lots of connectors on it to connect to many other (peripheral) PCBs which have sensors and report data to the MCU on the main PCB. I wanted to ...
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0 votes
1 answer
181 views

How to detect a magnetic field from a distance?

I want to detect a magnetic field, like those of small neodymium magnets, from at least 6 inches away (the further the better, I'd like at least a foot but I won't ask for too much). I'd like to do ...
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0 votes
0 answers
97 views

Wireless torpedo charger: Coil design and torpedo detection

I'm building an RC submarine with torpedoes and I thought a good way to power them would be with a capacitor. To keep everything water tight, I am hoping to use wireless charging. Here's a rough ...
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