blood pressure/heart rate monitor controlled time lock

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Forum topic by davidbenjamindix posted 12-28-2010 05:44 PM 1082 views 0 times favorited 3 replies Add to Favorites Watch
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12 posts in 2884 days

12-28-2010 05:44 PM

i am a woodworker that enjoys electronics and magnetivity. i make custom woodworking lock boxes with hidden magnetic locks. what i’m trying to conceive is some type of heart rate monitor locking/unlocking device, or a blood pressure band.

two things:
1. if i got my hands on an electronic blood pressure cuff, in the box you have to put your arm inside the box while it’s locked to actually reach the lock. when you insert your arm, the cuff automatically tightens, and this serves as a security feature for the lockbox. of course if you can’t unlock the box, you’re kinda screwed, until the timelock’s timer countdowns, then the blood-pressure cuff releases and your arm is free again.

2. if i had a heart rate monitor hooked up to a lock device, you would attach it to your arm, and actually have to get your heart rate on a specific number for a few seconds, sending a signal to a switch that unlocks the box. how can i accomplish either of these problems?

David Dix

3 replies so far

View Woodworker123's profile


89 posts in 2848 days

#1 posted 12-30-2010 03:09 AM

Hi David, have you heard of Arduino before? A co-worker of mine plays around with them as a hobby. They are essentially cheap and accessible micro controllers, with a large community of hobbyists to draw knowledge from and many plug and play sensors and other components. I think for a pretty low cost you can get started with it, and it shouldn’t be too hard to do some of the stuff you are talking about.

1. Maybe an IR source and detector, that a person’s arm interferes with. Not sure what kind of power this would require since it’d always be on, otherwise you could use a switch that someone couldn’t help but trip.

2. See above about Arduino, I think this is entirely possible, I just wouldn’t be able to tell you exactly how.

View davidbenjamindix's profile


12 posts in 2884 days

#2 posted 12-30-2010 04:58 AM

i also considered other options like a motion detector type switch. basically, i take as many possibilities, criticisms, and suggestions people give me, take the one or two that seem realistic, and customize those ideas for whatever im working on. i just clicked on that Arduino site. very interesting! im going to look into that a little more. thanks!

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18267 posts in 3670 days

#3 posted 12-30-2010 08:11 AM

If it is too tight too long it could do serious damage like a tourniquet. A proximity sensor would turn on the BP cuff. Most of the portables I have seen have a heart rate monitor. If you can access the digital display number output, you should be able to send that signal into your release controller.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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