Automatic baby cry detection

A friend of mine asked me today if I could help him construct an automatic crib for his newborn child. He wants to make a crib that automatically starts moving from side to side when crying sounds are detected. How do I make something to detect crying?! Where do I even start on this one.. ? :)

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How about "get yer arse up and take care of your child"?
Um... I meant that in a nice way. I have a young one and I feel your pain. For serious bodging together, find any sound-activated toy (there were quite a few holloween decorations that had sound activated bits this year) and have it trigger a rocking device as suggested by kiteman. My solution? I put a modified a canine training collar for my wifes' ankle. Whenever the noise from the baby started to bother me, a quick push on the remote trigger would get her moving.
NachoMahma9 years ago
. I don't think you'll need to get as complicated as Goodhart is saying. You should be able to trigger on any "loud" sound as the baby will probably be in a relatively quiet room.
Yeah, you're probably right.....I tend to over do things at times ;-)
You can get baby monitors that flash a row of LEDs - the louder the cry, the more LEDs light up.

You could open one of these up and use the output to one of the LEDs to trigger a rocking device - just select the appropriate LED to match the amount of crying that would normally make you get up and rock the crib.

The actual rocking device should be fairly simple as well - there are commercial versions available that consist of motors with off-set masses on their shafts, effectively large, slow pager motors. I think some of them even have timers, so maybe all you need to do is connect the LED supply to a solenoid, and replace the on-switch of the rocker with a reed-switch.
And then, maybe a timer that would sound a quiet alarm in your room in the event that the rocking didn't accomplish it's said end (in the event something else is wrong in other words).
If you're working it via a baby monitor, you'd be able to hear what's going on anyway.
From experience with an alarm clock, if a person ignores a sound often enough, they may eventually not hear it at all. This is the reason I never use the snooze alarm anymore. I had to move my alarm clock clear across the room when younger, just to get me awake enough to go shut it off, rather then sleep through it. After using that snooze button enough times, I eventually just didn't wake to the noise at all.
chr (author)  Goodhart9 years ago
Hehe, I have the same problem. Some times the alarm clock can ring for a full hour and give up without me even noticing. It's best to use a cellphone and change the sound from time to time :)
Goodhart chr9 years ago
Well, it would wake me, but then I would shut it off without waking fully. That was the reason for the moving it across the room.....I had to walk barefooted across the hardwood floor to turn it off......I was awake by then :-)
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