Questions tagged [detection]

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1answer
53 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
60 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 ...
2
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1answer
48 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
78 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
59 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
43 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
99 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
34 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
68 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
52 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
81 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
25 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
63 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 ...
0
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1answer
35 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
306 views

Circuit to detect broken fuse

Consider the following circuit: [edited schematic] DC_gen1 and DC_gen2 are two +28V dc ideal generators. ...
2
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6answers
435 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
33 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
105 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 ...
2
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3answers
168 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
78 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
70 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
50 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
52 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
40 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
78 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
103 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
149 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
82 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 ...
1
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2answers
211 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 ...
2
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2answers
231 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
24 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
309 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,...
1
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2answers
70 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
152 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
95 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
267 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
431 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 ...
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1answer
501 views

Detection of lung sounds using a stethoscope and a sensor [closed]

I am currently working on a on a project for detecting sounds which uses a stethoscope, where its one end is connected to a sound detection sensor which is further connected to an Arduino board. The ...
0
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2answers
117 views

Voltage Detection via Analog Comparator

I'm currently designing a PCB at which I have an lithium ion battery (4.3V max) attached. The battery is charged via USB (5V). The charging controller is enabled by a microcontroller which should ...
-1
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1answer
97 views

Radio frequency detection without digital clock [closed]

Is it possible to have a circuit that does something (fires a pulse, turns on a voltage, whatever) when it detects a radio signal at a specific frequency? One crucial point is that it should do this ...
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votes
3answers
215 views

Detecting human body current with raspberry pi [closed]

I want to be able to detect on my raspberry when a human contact is made with a GPIO pin (or a cable linked to a pin). I am pretty sure it's possible (for example when i see this kind of projects : ...
0
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2answers
270 views

USB Drive detection circuit [closed]

I am building a simple portable speaker using a DFPlayer Mini, but I think that's not entirely relevant to my question. I am looking for a way to detect when an USB Drive is plugged in, so the player ...
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1answer
599 views

presence detection using Panasonic grid eye [closed]

I want to use grid eye AMG8833 for presence detection. Has anyone used gridEye for the same purpose? Or Can someone suggest algorithms to decide whether someone is present beneath the sensor or not ?...
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2answers
46 views

Sensing Mobile Battery full and cutting down power on V_bus line

I just come across the situation to cutoff the power when mobile battery full is detected (by breaking the +5v line) .I planned to implement this using high side current sensing method.When the ...
0
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1answer
138 views

RFID (or other) - Proximity Detector

I am trying to detect how often 2 animals 'interact'. Say I have 4 cats, I am trying to work out how often each of the cats interact with each other. I have considered using RFID tags attached to ...
0
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1answer
136 views

Inductive Coil - detecting open coil

We are using an inductive coil transformer for a sensor. We excite the signal with a low frequency (1kHz-3kHz), and what we measure on the secondary indicates the proximity of a part. Generating the ...
28
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7answers
6k views

Smart ways to detect a button (less power consuming)

During a meeting for a particular project I was asked to think about the way to detect a push on a button with a MCU. The detection should consume as little power as possible. At the first glance, I ...