Im thinking of a way to check if child or adult. My son has autism pretty bad. I don't want him getting out of areas unchecked.
My ideas:
Hand width... Several capacivve pads spaced about 5-7" . If all values drop together == big hand.
Ultrasonic or TOF laser proximity... Mount on ceiling to estimate height.
Weight. Use sandwich of plywood subflooring and rubber tubes pressure goes to a air pressure sensor (the kind with nipple, not the one for barometric). Pressure corlates to weight.
In the early stages of my mother-in-law's battle with Alzheimer's she was a flight risk (in fact she got out once and was found 1/2-km away, lost and confused...) We installed a simple lock on the front door she couldn't reach but there was always someone with her after that:
Of course, with any "restraint" system you need to be careful about risks (e.g. relying on an Arduino and the code running on it to protect a vulnerable child.) You also need to be mindful of situations where having him locked in a room would be bad: for example, a fire or a power outage.
From a purely conceptual perspective, you might consider a fingerprint scanner system:
Safety first.
Some kind of RFID solution e.g. add tags to clothing?
You might want to checkout the E-Textiles section;
https://forum.arduino.cc/index.php?board=13.0
@Blackfin's comment about the risk of a lockin are valid. Perhaps the system should just generate an alert.
ardly:
Some kind of RFID solution e.g. add tags to clothing?
Hospitals use a lockable wristband arrangement with detector units outside each applicable doorway, alarms at nurse centre.
Clothing tag too easily removed.
mattlogue:
Im thinking of a way to check if child or adult. My son has autism pretty bad.
What you're really looking for is to distinguish "this specific person, or not". Or maybe "authorised person or not".
It sounds indeed like you're trying to secure specific passages - with doors or other physical barrier?
The second may be the easiest to implement: lock on the door and only the "authorised persons" (such as parents, caretakers, the cleaner) have the key.
what about a keypad locking system that is powered directly from mains and interfaced with a smoke detector.
Powering the adapter from mains (bypassing solar or IPS systems) provides safety incase of power outage.
a small battery powered smoke detector interfaced with the arduino unlocks the door in case of a fire,even if the mains line is still on.
Ofcourse the lock has to be configured to turn off if the power is out,in other words, only active if power supply is active.
