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epilot said:Hello friends,
i need for something(sensor or a circuit) to detect when someone is awake from sleeping, i mean it must be at standby state while the person is sleep and when he or she is waked up the sensor or circuit must detect this state
thanks in any advice
falmeshon said:by woken up do you mean sits up in bed,gets out of bed, opens eyes or any other way of determining if someone has woken up?
akg said:i have heard that during sleep our skin temp drops. so u can check that parameter to determine the sleep(?) .
also what abt a pressure sensor in the bed.(assuming an awake person will get up from bed)
i feel . sleep itself is a complex psyological and psychological state .sensing EEG would be the best bet other than temp/breathing/heart rate etc. may be a psychologist could help u.we have to think of other possibilities.epilot said:i dont think the body temp incraces immediately ater awake if the idea about skin tem be correct.
no pressure sensor is not good because i need to know if someone is awake from sleeping
Oznog said:Didn't we have a similar question awhile ago?
Skin temp: basically impossible
Eyes: extremely impractical. Not only would it be very advanced for a machine vision application to determine this, but you'd also need cameras from different directions. I could still always find an angle not covered by a camera.
Motion: Well, you can detect when somebody walks by, but that's not really the question. You can't point a PIR motion detector at the bed either. Awake people sometimes don't move. Sleeping people turn over in bed which can set off a PIR.
Respiration, heartbeat: not all that consistent, and you need sensors hooked up to the person.
Basically "asleep" is a pretty tough determination. It's only really possible with brainwave measurements. I'm not sure if wiring up a person's head is what you have in mind though.