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Questions tagged [detection]

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What circuit could I use to detect that there is no ground connection?

I'm trying to design an Electric Vehicle Supply Equipment (EVSE) and want to add a circuit capable of detecting no ground connection. I've seen that some EVSEs can detect this, so my question is: What ...
WalterPH's user avatar
  • 440
0 votes
1 answer
62 views

Detection system for specific material

I'm looking for some ideas on how to detect some kind of material/tag that can be electrically distinguished amongst organic material, wood and iron. Such material/tag should be possible to detect ...
Kacper's user avatar
  • 1
0 votes
0 answers
22 views

PIR sensor and its working

I have been designing a PIR sensor circuit for occupancy sensor. We have been facing problems like fault detections most of the time when we turn on air conditioning. There is also issues like the ...
Aakas Pulikkal's user avatar
1 vote
1 answer
113 views

How can I visualize 24 GHz RF on a screen?

Is there a (preferably inexpensive) way to visualize/image 24 GHz RF from a radar gun (of the type used to check baseball speeds) on a screen? Here are some examples of what I mean, for other ...
daniel's user avatar
  • 145
2 votes
1 answer
50 views

Detecting a very low current vs open wire [closed]

I am working with a few 0.333V CT and at times, the operating current is very very very low, near 0. I need to be able to detect between a very low amp reading vs an open wire. Is there a way to do ...
Spy's user avatar
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5 votes
4 answers
1k views

Is it possible to do water detection with a single electrode?

I need to detect the presence of water, but there is a catch. I can only have one single electrode contacting/submerged in water. It is in a mini-tank made of plastic (for a handheld device) so I ...
nk13's user avatar
  • 65
0 votes
1 answer
55 views

Effective solution to detect objects on a board with "Positions and IDs"? (RFID, Capcitve Sensor touch, Optical Sensors, NFC, Magnetic Sensors)?

I have a board comprised of electromagnets array, to drive certain objects having magnets attached to them on its surface. Using a microcontroller I plan to move those objects by switching the ...
Kush_Uttam's user avatar
0 votes
1 answer
88 views

IR laser detection

I'm currently trying to characterise a NIR 940nm laser device that I have recently made. The main thing I want to achieve is to see if the laser is truly doing what the enable signal told it to. I ...
Boan Fang's user avatar
1 vote
3 answers
196 views

Detect the 2D position of a ball hitting a 6ft x 6ft wood target [closed]

My son is 10 years old just starting to play baseball and loves pitching. He is constantly throwing a ball at a wall trying to get better. He also loves technology so we want to help him where we can. ...
Nikki's user avatar
  • 11
1 vote
2 answers
115 views

How to convert a varying 28~60V DC high into 3.3V?

I want to design a PCB, include a GPIO of a MCU detecting the on and off of a LED driver. The LED driver input is 220V 60Hz, the output varies between different LED within 28 to 60V DC. My intuition ...
Superuser's user avatar
  • 169
0 votes
0 answers
73 views

Help with circuit for school

I am doing a project for school with two friends. We are going to make a DIY metal detector. We are using a source as our circuit. Can someone help us describe what is happening in the circuit?
Mattiz Ketels's user avatar
3 votes
2 answers
168 views

How can I detect when football passes through a hula hoop?

How can I measure whether a football passes through a hula hoop? The main challenge is the need for outdoor use, which presents difficulties due to the presence of ambient light (sunlight). It might ...
FPSX V's user avatar
  • 31
8 votes
3 answers
2k views

How can I detect when a signal becomes noisy?

I'm using a sensor to measure water potential. We record the output value every minute. Up until 4/16, the signal is pretty clean but I need some sort of way to detect when the signal starts to get ...
BiosphereEngineering's user avatar
0 votes
0 answers
45 views

Second power supply detection

I have a power supply (5v) and I would like to detect when a second power supply of the same voltage (5v) is added to the circuit, the only idea that came to my mind is: My idea: To measure with the ...
giliroller's user avatar
2 votes
1 answer
218 views

Mains AC detection circuit - will it work?

I´m trying to detect mains voltage (230 VAC) across AC_SENS_L and AC_SENS_N. AC_SENS_IN goes to an Arduino input with pull-up. I only need to detect if voltage is present, not what voltage. Any ...
VLKRT's user avatar
  • 53
2 votes
1 answer
70 views

Best way to detect failing batteries

I have a few IOT products scattered around long distances, they use solar and batteries to run. They are LiFePO4 12.4 V systems deployed in the South East US. I have them report all the data available ...
Dat_guy_who_hangs_out's user avatar
2 votes
2 answers
889 views

Any way to test continuity of a potentially live circuit?

I'm trying to add an indicator to a relay circuit; specifically, I want to know if it's open or closed in a way that can detect contact welding. (I considered a DPDT relay, but it looks like these ...
Matthew's user avatar
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0 votes
1 answer
313 views

Choosing the right LED IR and the photodiode for optical beam sensor

I need to design an optical beam sensor for about 15-20 cm of distance - any obstacle between an emitter and a detector would trigger an interrupt for a microcontroller. I was thinking about using a ...
Adam's user avatar
  • 145
3 votes
3 answers
750 views

Trying to develop a peak detector circuit

The circuit below has as an input a sound wave that is amplified (the op amp used is an ideal one) that then goes through a peak detector circuit. I intended to implement part of this circuit using ...
Scipio's user avatar
  • 803
0 votes
4 answers
493 views

How to detect a sine wave signal to trigger a logic gate? [closed]

I need a way to detect a signal input and then output it as a logic high. The signal input has a 40 kHz frequency and it's a sine-shaped signal. The amplitude is not sure, could be from 12 V to 1 V. ...
jjk's user avatar
  • 123
1 vote
3 answers
117 views

Detection device for robots [closed]

I am an electrical engineering student and I have been in robotics since 2019. I want to create my own robots and I need advise on a detection device. Context : The match happens on a 1m×2m table, 2 ...
GabrielT's user avatar
  • 121
1 vote
2 answers
136 views

How to detect whether the a 2-position fan connector on a PCB is plugged or not without turning on the fan?

On the PCB just a simple circuit to drive a 2-wire fan when we plug it to a 2-position connector on the PCB. Is there a way to modify something on the circuit to know if the fan (DC motor) is plugged ...
Abdelwahab_HW's user avatar
0 votes
2 answers
2k views

Thermocouple short-circuit detection

I'm trying to figure out how to detect a shorted K-type thermocouple (between the wires, not a wire to GND or Vcc.) I would define a short as thermocouple resistance < 0.1 ohm as opposed to 1 ohm ...
Hyp's user avatar
  • 877
3 votes
5 answers
1k views

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 ...
Pablo's user avatar
  • 1,561
-3 votes
2 answers
3k 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 ...
Robotex's user avatar
  • 153
2 votes
1 answer
157 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 ...
sandyscott's user avatar
0 votes
1 answer
412 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 ...
Milo Banks's user avatar
0 votes
1 answer
290 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 ...
imperf's user avatar
  • 15
0 votes
0 answers
124 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 ...
LazyTurtle's user avatar
2 votes
0 answers
122 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, ...
Juan Pablo Naranjo's user avatar
3 votes
3 answers
1k 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 ...
Lyoner's user avatar
  • 339
1 vote
1 answer
121 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 ...
Roko's user avatar
  • 51
0 votes
1 answer
763 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 ...
nipil's user avatar
  • 35
0 votes
2 answers
219 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 ...
Mantabit's user avatar
  • 343
0 votes
1 answer
688 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 ...
Muxa's user avatar
  • 161
0 votes
1 answer
625 views

Detecting cable is connected

I'm trying to figure out a way to detect if a RJ45 cable is connected, and report that to a microcontroller. I'm not using the IP standard, I'm purely using the cable for the ease. A bit of reference: ...
bedrock's user avatar
1 vote
0 answers
616 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 ...
Mitchell's user avatar
1 vote
1 answer
158 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 ...
Kaldek's user avatar
  • 11
0 votes
1 answer
443 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, ...
VanGogh66's user avatar
  • 301
3 votes
1 answer
1k 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 ...
goodie's user avatar
  • 171
0 votes
1 answer
94 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 ...
FourierFlux's user avatar
0 votes
1 answer
135 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 ...
Israr's user avatar
  • 249
0 votes
0 answers
762 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 ...
Rakibur Khan Rahman's user avatar
0 votes
3 answers
352 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 ...
zelyev's user avatar
  • 13
7 votes
3 answers
909 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 ...
Steven Sagona's user avatar
0 votes
1 answer
505 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 ...
floyd's user avatar
  • 99
0 votes
1 answer
202 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 ...
CraftyMyner's user avatar
0 votes
2 answers
66 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 ...
Sergius's user avatar
  • 103
1 vote
0 answers
31 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 ...
6cfc1's user avatar
  • 11
2 votes
2 answers
139 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 ...
rmac's user avatar
  • 21

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