The detection tag has no wiki summary.
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2answers
61 views
Minimum tolerable signal to noise ratio in modern communication systems
What is the minimum tolerable SNR in today's (digital) communication systems for successful recovery of the message? I've heard that regular commercial systems can recover the message with a SNR as ...
-2
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0answers
35 views
Detection of semi-passive tags at long distance
I am working on a project that may use an RFID tag. I would like to detect a small object from a long distance (maybe 15-20 meters). I used to think that an RF passive tag may be good but I've heard ...
2
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1answer
81 views
Detecting if two objects are close to each other
I am an electronics beginner but want to make two devices that can detect if they are near each other.
So if the devices enter a radius of less than 2 meters of each other they will both trigger an ...
4
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1answer
394 views
AC detection for microcontroller
I need to monitor the state of multiple relays carrying 110VAC and 60VAC using a microcontroller (I will probably use an Arduino) to ensure the relays are working properly.
To do this I have figured ...
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3answers
330 views
What is a good approach to detecting distance and speed in model railroads?
Up front I must admit to little hands-on knowledge of modern microcontrollers and their software - I know power engineering and big motors much better (45 years of it).
Now, my question:
Trying to ...
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0answers
53 views
Any thoughts about metal ore detection? [closed]
I am doing a project which involves a way to detect metal. The problem is
it must be able to detect any metal( iron, copper, or
aluminum, any metal). Does anybody have
any suggestion about that?
5
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7answers
1k views
AC polarity detection
How can I detect AC 'reverse polarity' (single phase) (without the use of ground/earth) and drive a led when the polarity is reversed?
It should at least detect 230 VAC but it would be ...
2
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0answers
73 views
USB to detect electrical charges [closed]
How would I go about making a simple board (preferably USB) to detect when electrical current is passing through? This information would have to be routed to, and readable by, a computer.
4
votes
1answer
178 views
Designing a wide-range light detector circuit
I'm looking for a few hints in designing a light detector circuit.
Priorities are that the circuit is simple (both as in few parts and as in relatively easy to understand), rather cheap, and can ...
5
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4answers
647 views
Specific color sensing, is it possible in an economical way, without using camera/image recognition?
While I understand that color sensing with camera and sufficiently powered processor running image histogram logic (or other such algorithms) can determine presence of certain colours fairly reliably.
...
5
votes
1answer
472 views
Long range RFID detection
I have a question about detecting RFID tags at long range. I understand there are LF,HF,and UHF RFID frequencies.
I'm looking to detect a tag from a minimum distance of 2 meters (actually, 5 meters ...
5
votes
2answers
393 views
Low battery detection circuit that can tell if temporary voltage dip or actual low battery
I am currently using a schmitt trigger to turn off power to non essential circuits when the battery voltage dips below a certain threshold.
The problem with this circuit is that it is dumb, i.e., it ...
2
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1answer
96 views
Options for object tracking
Say a company has a parking garage for its employees, and they want to track the traffic in and out. So they require that all employees put some kind of tag in their car window, and they have some ...
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2answers
105 views
what is the simplest set up for detecting ions?
I try to detect a flow of positive charged ions. These ions produce an electrical current in the order of 10^-12 Ampers. My question is that, what is the simplest set up for detecting these ions?
...
5
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6answers
388 views
Detecting object placement on a grid
I am working on an Android ADK project. I am looking for a way to detect the locations of chess pieces on a board (8x8). I was looking at things like NFC but It looks too expensive. Is there a ...
0
votes
1answer
88 views
Finger movement detection devices
Let's consider a device such as a game controller or a standard remote control, but which is not controlled by "standard" keys. Instead, the idea is to minimize finger movement, such as in a keyer. ...
2
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2answers
336 views
Detecting a 15KHz pulse with logic output
I want to build a simple and ultra low cost circuit that can detect a timed (let's say 200ms) pulse of a single sine frequency - say,15KHz. Amplitude will be around AC ~1Vp-p. Detection will give a ...
4
votes
3answers
1k views
How do network devices detect whether an ethernet cable is connected?
I have a bit of kit with an FPGA on it which includes an ethernet adapter. I'm trying to diagnose why it's not working and while I do that I've noticed that with an ethernet cable connected to my ...
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3answers
288 views
Sensing when micro USB power cable is unplugged from a smartphone (or other device)
I am looking to create a charging device that can provide 5v power to charge a smartphone (or other consumer electronics device) via micro USB. How would I go about making this charging device "aware" ...
2
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3answers
128 views
Detecting which pins are inputs or outputs
I have an idea to make a device with a generic ZIF socket which can be used to identify any chip you place into it and once identified run a suite of tests to verify that the chip is functional. I ...
1
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1answer
125 views
Scan for mobile phones?
I'd like to measure queuing time, similar to what they're doing in Finland. Instead of detecting bluetooth (which is disabled in most phones) I thought of detecting EDGE/3G.
I'd like to log the ...
1
vote
3answers
2k views
Sample Application with LHI 778 PIR Sensor
For a motion detecting application I found a sensor with code LHI 778.
If you look at the datasheet in the link, the characteristics of its internal FET transistor is not specified and there is no ...
2
votes
2answers
507 views
Driving servo motor using open cv
I'm working on a object detection robot project.I'm using open cv software to detect objects.
My question is how can i take open cv outputs(x-y coordinates) to servo motor.and how can i interface ...
2
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3answers
211 views
QRCode electronics
I am designing a portable device meant to be connected to multiple computers and able to recognize them. I am thinking of a qrcode, different for every computer and displayed on their screen, that my ...
6
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6answers
1k views
Symbol rate (baudrate) estimation
I am looking for a algorithm that can detect the rate of symbols in a base-band signal.
The Gardner method is a way to cancel out the timing drift and synchronize the receiver to sender when the ...
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vote
5answers
369 views
My boss has asked me make a device which is capable of scanning rooms for bugs!
Well this as I searched on the net is advertising, making money and fools out of those who want to make/buy such a bug scanner.
I am not an electronics engineer but am being forced to.
I do have ...
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3answers
1k views
Understanding the IR Emitter / Detector I pulled off of an inkjet printer
Long Story Short
It's a "linear/rotary optical encoder," or, "incremental encoder," like this one, which costs about \$6:
...
2
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1answer
136 views
Detecting surrounding electronics or electrical devices
I'm working on a project which requires using EM antennas or sensors array to identify and locate surrounding electrical devices such as cellphone, laptop, ipod, remote...
I'm not a EMF guy. I don't ...
2
votes
1answer
194 views
Detecting opens/shorts when driving coils
Using software while PWMing a coil with feedback going to an A/D input,
1) how can you detect a state where the coil is an open circuit?
2) how can you detect a state where the coil is a short ...
11
votes
4answers
5k views
How does an audio jack detect when a speaker is plugged in?
Some sound card audio jacks can now inform recent Windows OS's that an audio device is plugged in. Anyone know how it does this? I'm thinking it uses some kind of voltage comparator or resistance ...
7
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2answers
2k views
Detect aluminum using an inductive sensor
I was wondering if you can use an inductive proximity sensor to detect aluminum or if a capacitive sensor must be used? I wasn't sure if inductive sensors were reserved for ferrous metals only.
21
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3answers
1k views
6
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3answers
1k views
Olimex Arm USB JTAG Programmer Problems
I've recently bought an Olimx ARM-USB-OCD JTAG programmer but I've had difficulty getting it to work.
My primary system is linux, but I've tested it in window with no luck there either. I'm using ...
