Questions tagged [detection]

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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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1answer
59 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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1answer
51 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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1answer
78 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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2answers
86 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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1answer
64 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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1answer
37 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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0answers
67 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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1answer
72 views

UART broken wire detection

I am planning to create a broken wire detection between a UART communication. The main idea was to check the Tx and Rx lines with a retriggerable astable Multivibrator which creates a HIGH Level on ...
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0answers
16 views

Cell size and CUT choosing in CFAR for radar detection

So, I was wondering how the CFAR for radar detection works. So, you have your received signal, the echo, and you divide it into cells, but how do you choose the cell size and the CUT? For the ...
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1answer
62 views

Defect LED detection for car lights

The schematic beneath is a new project of me. The theory behind this is: My car has a very fool proof bulb failure detection and warning system. CANbus proof LED bulbs can't fool the car and just a ...
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0answers
42 views

What options for detecting presence?

I'm not looking for product recommendations - I'm looking for advice on what different kinds of devices exist that would be capable of detecting the passing of an item of clothing on a rubber conveyor ...
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1answer
63 views

Designing a frequency detection circuit [closed]

Hi i was wondering if its possible to make a digital frequency detection signal which detects which generation is being used by nearby mobile phone ie:gsm 3g 4g the frequency band varies according ...
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1answer
161 views

Isolated mains (AC) presence detector

I need to detect a AC mains outage, isolated way. Output marked as [?] goes to AVR MCU. I don't need to detect undervoltage or zero-crossings. I actually need a simple feedback to MCU interrupt which ...
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1answer
88 views

circuit to detect chess clock toggle change to fire BT button

I was looking for simple circuit: (SamGibson's idea to add a 2nd reed switch proved possible, see update below.) to detect transition to flat 0 V when player B's clock is running. to detect ...
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0answers
65 views

How can I increase the distance of a photodiode

simulate this circuit – Schematic created using CircuitLab I wanted to make a fire detection system using a photodiode, comparator with potentiometer to adjust sensitivity, and an alarm circuit ...
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1answer
52 views

Fast mains outage detector

What is the fastest mains outage detector at <1ms? Anything that uses a 12V DC adapter or a mechanical relay is not an option for me because it has a long delay. Is there an AC driven static/solid ...
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0answers
47 views

Composite video signal detection problem?

I have an android headunit and I installed a reversing camera to it. The problem is that the headunit does not seem to detect the camera signal if the environment is too bright. It just shows black ...
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2answers
193 views

touch sensor for metal door handle

I was thinking if a current is applied to a metal door handled and somebody touched it that should complete the circuit to ground and be detectable but I'm not sure if this would work as the 'somebody'...
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0answers
37 views

LED Bulb Failure detection system

The below figure is the current system I am using and working fine. The only problem with this the bulb it will burnt out within short period of time. Now I want to to change it with LED bulb, but the ...
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1answer
78 views

How to get a 1 clock period pulse from a constant input? [duplicate]

I want to make a digital circuit that produces a pulse 1 clock period in duration whenever I see the input to the circuit go HIGH. I only have a flip-flop, an AND-gate, and an inverter. How do I ...
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1answer
61 views

door bell detector using NodeMCU

i modified my door bell with a NodeMCU which is now capable of triggering the door opener using a relay. Now I want to add a door bell detection to this system. I figured out two contacts which supply ...
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1answer
95 views

What type of sensor to detect if an object passes through?

(Sorry for my bad English) Hello guys, I need your help since I have no idea about electronic stuff. I have a table soccer and want to install motion sensors in the goals, so whenever the ball ...
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0answers
27 views

Scalable NFC antenna surface for multiple object detection

as I am absolutely new to NFC and electrical engineering in general (my background is software engineering), I will probably upset users on this Stack with my lack of previous research. But the idea I ...
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1answer
73 views

USB type c receptacle plug in detection

How does usb device with type-c receptacle detects, that plug (just bare usb type-c plug, without cable, and resistors) is attached? Does USB specification describe this possibility? I know, that my ...
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1answer
36 views

Detecting signal / amplitude from 2 wire DC speaker

I want to create a circuit that replaces a 2 wire speaker in an existing electronic device. I want the device to be able to trigger an output when the amplitude of the signal that would regularly ...
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5answers
381 views

Circuit to detect broken fuse

Consider the following circuit: [edited schematic] DC_gen1 and DC_gen2 are two +28V dc ideal generators. ...
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6answers
716 views

Reflect IR beam off reflector instead of emitting straight to TSOP receiver

I have a working set-up to detect beam breaks using an IR LED, modulated at 36kHz, and a TSOP receiver connected to a comparator. It outputs the count via Arduino. The range is about the width of a ...
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0answers
35 views

Matched filter realization in voiceband modem?

As far as I understand, Adsl modems perform the signal detection with DSP-made matched filters. How was the same thing done in voiceband modems, for example the 56k modem?
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1answer
128 views

Electronically verify whether cable is connected to RJ45 connector

Background: I have a device that interfaces with a motor controller over RS-485 via an RJ45 socket. Currently, the port is a standard 4x2 RJ45 connector with the RS-485 using pins 2 and 7 Currently ...
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3answers
171 views

Which is the most recommended sensor for sensing humans inside a rail passenger car? [closed]

I am thinking of an application which is necessary to know if there is and where someone is located, inside a rail passenger car or bus, for example, the problem there is many external factors such as ...
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1answer
99 views

How do I detect a pattern of 4 pulses from 4 different signals?

How do I detect a pattern of 4 pulses from 4 different signals? I want to be able to detect every time I see for example the pattern circled in blue. When I detect this pattern, I want to output a ...
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2answers
85 views

Metal detection with a coil matrix

I have an 8 x 8 grid and would like to detect where on the grid I place a metal object. I'm currently working with the TDA0161 metal detection IC, and so far have the following setup with detection ...
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1answer
77 views

How to measure load detection for ballast output 18W

I have a high performance ballast of only 18W and 36W. I would like to do a detection circuit whenever the UV light tube does not have any light out, an alarm/signal can be triggered to replace the ...
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1answer
57 views

Looking for a short range detection and identification

I am currently building a smart cat door. One of its functionalities is that it keeps the door locked until our cat comes close to it, then it unlocks the door. I tried using RFID, the RC522 because ...
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1answer
42 views

Detection of Acoustic signals

There is a scenario: There is a certain box which emits acoustic signals at 30kHz and you are trying to detect these signals using some sort of detector. I was wondering, would it be more efficient ...
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1answer
95 views

How to mute microphone in 2-way communication when the speaker is active?

I'm making my own two way intercom for my house. There will be a speaker and microphone above the front door of my house (as well as a camera). When someone rings my doorbell, I get a notification on ...
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2answers
108 views

Is there such thing as a Laser beam detector that returns a non binary result?

As the title implies , i'm looking for a device that can detect at what point a laser beam has been broken. So idea would be the device to output a certain voltage depending on where someone's finger ...
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6answers
155 views

Electrically detecting a not connected input

I have a 0-30V DC signal and it can be physically disconnected from a circuit. I need to detect and generate a TTL output when this signal is disconnected. The "detector" circuit and the signal will ...
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1answer
84 views

Detecting a feather touch [closed]

New to the forum here, but I have a need to detect a feather touch. Is there any sensor that is recommended? This will be in a vibrating environment, so audio is probably out of the question. Is a ...
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2answers
216 views

Package detection in datastream on FPGA

Hardware: I have an asic-"sensor" which sends me 32-bit packages (serial). I need to detect this packages with an FPGA. When I start the readout, the sensor is sending me data-packages until I stop ...
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2answers
256 views

Detect if 470pf capacitor is in series with motor, using only two wires

Short Version: How can one detect if a vending machine motor is in its home position? Long Version: I am trying to make a circuit that would fit most of the motors used in the coil vending machines ...
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1answer
25 views

Variations in RFID USB Serial reader detection distance by connected device

I have a RFID reader that sends the TAG information over USB serial. I have had some troubles with it in a product where the detection success rate changes alot depending on what the USB RFID tag is ...
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4answers
364 views

Is this line detector safe?

I'm thinking about building a basic AC mains voltage detector. I'd like for it to be both protected and isolated, so I have a zener TVS and an optoisolator. R1 and R3 are chosen so that between them,...
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2answers
83 views

Pulse Train Sampling Rate

Assume I have a pulse train with frequency of F Hertz. A normal square wave has all odd harmonics. From Nyquist, if I want to "Reconstruct" the waveform, sampling frequency Fs should be at least 2*(...
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1answer
183 views

SNR wall definition

I want to ask you if my understanding of the definition of the so called "SNR wall" is correct and complete. The SNR wall phenomenon is described here and here. If one has further information that ...
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3answers
96 views

How do I keep the “detected” state ON in a PIR detector until a human has left the detection area

A PIR detector stops alarming after a while, if a human in the detection area doesn't move. How do I keep the alarming state ON as long as there's a human in the detection area even if he doesn't move?...
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1answer
338 views

long-distance sound detection/recording solution? [closed]

My general requirement is an audio input system which can effectively detect sound signal (80dB at about 5cm) over 30 meters away. The supply voltage should be within 5V so that the system can work ...
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3answers
1k views

Analog (POTS) telephone off-hook detection

With a single POTS telephone line and two or more handsets, when a call comes in, each handset can join in with the call. This can sometimes be an issue when one user doesn't know the line is in use, ...
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2answers
492 views

Non contact (contactless) AC or DC detection?

I'd like to detect AC or DC current (not the current level just nothing or something => ON/OFF) in a wire with a (DIY) sensor just in contact (glued) with the wire plastic insulator. At the end the ...