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๐Ÿงต How do sensors actually work?

Anonymous No. 16377547

What do we mean when we say the sensor 'sends a signal'? *How* does it do so in response to some input like temperature changes?

Anonymous No. 16377552

>>16377547
a better question is would a robot with sensors feel in the same way a human would when it touches something?

Anonymous No. 16377556

I dunno bro, ask a compiler

Anonymous No. 16377565

I've seen this thread at least 2 times...

Anonymous No. 16377610

Depends on what you're sensing. Temperature sensors may use thermocouple and seebeck effect to generate current as temperature changes. Light sensors use photoelectric effect, magnetic field sensor uses hall effect

Anonymous No. 16377714

>>16377547
it sends a change in voltage back to the "reader"

Anonymous No. 16377723

>>16377547
Different sensors work in different ways, you dumb fucking sub-monkey.

Anonymous No. 16377804

>>16377547
They're all basically variations on the same thing - using some physical reaction to create or change an electric current.

Most photosensors work by converting light into electric current via the photoelectric effect, most thermal sensors work by either using temperature gradients to drive an electric current or changes in temperature to alter the impedance of a circuit, etc.

Anonymous No. 16377827

>>16377552
>a better question
No. That was not a better question at all.

Anonymous No. 16378056

>>16377547
depends on the sensor
>>16377714
some sensors have their own intelligence and send telegrams via a bus like i2c to a connected mcu. some even have an interrupt line, so they can go 'listen here, you little shit.'

Anonymous No. 16378066

>>16377547
Im no EE but I imagine it's basically some electrical component interacting with a physical device, and the resulting voltage / current, which you can measure, is directly correlated with the thing you are trying to measure. Then put in an analog to digital converter and have some driver software or ISA extension run the computation to map your number to the actual physical value.

Anonymous No. 16378123

Sensors are indefinitely in a superposition state until a conscious observer collapses the wave function.

Anonymous No. 16378657

>>16377547
Most bare sensors are made out of some material that varies its resistance in response to whatever condition is being monitored (light, heat, etc), and the reading device uses a resistive divider to change that into an analog voltage level for reading. Some sensors will simply allow or deny current entirely (temperature threshold sensors, for example), which lets them be read as simply an on/off (a 1 or a 0).
Some fancy sensors will include on-board circuitry that handles turning the resistive value into some kind of digital signal by itself. How that needs to be read will depend on the exact model of sensor (might be I2C or similar).

Anonymous No. 16378713

>>16377547
https://www.youtube.com/watch?v=vJdcbhGa7Jk
This touch sensor senses a resistance change between two conductors that are almost touching. Quantum tunneling? I know with common wire connections the electricity has to jump over a layer of oxide.

Anonymous No. 16378792

>>16378713
>Quantum tunneling?
More likely capacitive coupling.

Anonymous No. 16378851

>>16377610
>seebeck effect to generate current
>>16377804
>create or change an electric current
>>16377804
>converting light into electric current
/sci is the worst place thinkable for /sci

Anonymous No. 16378854

>>16378792
well they speak about a resistance change, maybe they mean impedance

Anonymous No. 16378953

>>16378851
Okay, so what's your basis for how most sensors work? Magic?

Anonymous No. 16378989

Perhaps OP is really asking how analog-to-digital converters work.

Anonymous No. 16379968

>>16378989
OP doesn't know what he's even asking. He's expecting some sort of mystic philosophical bullshit when the reality is that most sensors are glorified switches and the rest of them are glorified batteries or solar cells.

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Anonymous No. 16380401

>>16379968
>mystic philosophical bullshit
How do physical processes like, *become* numbers and shit, man?

Anonymous No. 16380689

>>16377547
what course should I take to learn about sensors?Electric engineering? I like the idea of Automation Engineering that a university here offers.

Anonymous No. 16380726

Fuck /sci/ is retarded. OP if you want a real answers, check >>>/diy/ohm/

Anonymous No. 16380829

>>16378953
>Okay, so what's your basis for how most sensors work

Voltage in pure physical sensors, there are endless others. You cannot measure current (outside exotic labs). Topping the level of incompetency over her is Seebeck, no current influence by principle (0 Ohms).

All you little shitterss have no idea about anything but an opinion on everything

Anonymous No. 16380893

>>16377547
this is genuinely a bot post. i saw precisely the same thread about a month ago.

๐Ÿ—‘๏ธ Anonymous No. 16382649

Get a EE degree to find out

Anonymous No. 16382700

>>16380829
Just because you understand that current gets measured in series doesn't mean current is not being generated. You don't even seem to understand that you can't have voltage without current because the two have a direct relationship via Ohm's law since if you have 0 Ohms, you also have 0 Voltage since V=IR.

You don't seem to know much yourself despite your opinion and poor attempt at semantic arguments, you clearly don't even understand what is meant by an emf and how it relates to current and charge (or at least you could never actually explain it in english in a way that doesn't contradict what you just said), even if they are measured in volts.