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What kind of sensors and other stuff do I...
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What kind of sensors and other stuff do I need to achieve this?

Let's say those red and blue boxes are steel bars.
Red bar is fixed, blue bar slides up and down.
I need to attach a measurement to them so I know how much blue bar moves relative to the red bar.

I'm looking through industrial stuff on rs-online but I have no idea what do I need.
>>
A rotary encoder would do the trick.
>>
Like I told you on/g/, faggot, google for a linear motion encoder.
>>
a laser mouse would work.
>>
>>944510
As would a set of digital callipers. Which sounds like pretty much what he's trying to build.

>You're reinventing the wheel, OP.
>>
>>944475
Capacitive linear encoder.
>>
>>944514
This a pair of calipers rigged or a digital read out track.
>>
LDVT, or maybe its LVDT

linear encoder
rotary encoder
wire encoder

>>944489
what he said
>>944514
>>945770
or this

ghetto DRO
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