Short Range Motion detector

[ujjwal_sing]

Hello everyone .. ( first thing first my English is bad )
second I am kind of new with these things

so A while ( a year ) ago I try to make a device that can detect the eye movement close lid ( not tracking .. just simple detection if it move or not ) so I try a lot of approach and the closest one I got from IR distance sensor .. i try to make it sub-mm accurate so I can measure the difference between the height of centre of eye and rest, a lot said it's not possible or expensive but I find a sensor ( GP2Y0A51 ) can kind of do the job and here's the

of what I build but it's kind of not accurate enough and I want to make it more accurate btw here's the

( I know it's hand drawn because lost the files from a virus , I promise I try to make it same as I remember ) .

so here the plan guys , I will just send some IR light and it reflect from closed Eye-lid and get back to IR receiver so when I eye move we can detect the change in intensity

PROBLEM : I am kind of stupid and don't know how to control the intensity , amp the receiver's signal or use some filters to reduce noise that give the highest accuracy

OR I just want to know there must be a sensor that can detect like small movement in a very small area .. it must be there .. do if u guys know any sensor or like know something to do with the changes made so the old plane can be accurate .. I will be so thankful .. like a lot .

Btw I am trying to detect the REM sleep and want to make a lucid dreaming masks , also here's my cat image

[jremington]

Non-contact sensors capable of sub-mm accuracy are available, but they are very expensive.

Since your interest seems to be in REM sleep, I suggest to read scientific literature on sleep research to see what the professional researchers use.

[ujjwal_sing]

Hey it's you again @jremington .. first of all thankyou so much for all your time you given to help us .. I already doing the research but I will do it more often thanks for the idea <3.
also can u tell me some of these expensive sensor .. I might look how they doing it

[jremington]

An internet search for "high accuracy short range laser distance sensors" will produce results, but many of them cannot be safely used near eyes.

[ujjwal_sing]

Thankyou for reply and I made a progress here
I simply use a couple of IR transmitter and receiver that is shown below

and here the video of it actually working

WhatsApp Video 2024-02-15 at 21.41.02_74a90825.mp4

it's working fine but I need to learn to make changes in resistance and change voltage level or current to make it more accurate or something .. I am new to this things .