Forum Index
HomeZBasic Home   Forum RulesForum Rules   Forum FAQForum FAQ   MemberlistMemberlist   UsergroupsUsergroups   RSS FeedRSS Feed
Site SearchSite Search   LinksLinks   DownloadDownload   Digests and SubscriptionsDigests and Subscriptions
ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in   RegisterRegister
Motion Sensing

 
Post new topic   Reply to topic    Forum Index -> ZX-24
Author Message
pdubinsky



Joined: 25 Nov 2005
Posts: 66
Location: South Carolina
Posted: 13 April 2008, 18:41 PM    Post subject: Motion Sensing Reply with quote
Has anyone had any experience with using any devices for detecting human motion in a room? I can see sonar or infra-red doing it but the project needs to detect when there hasn't been motion for a period of time not just the entry into a room and I'm not familiar with sensors that could be used. Any ideas, experiences, warnings would be greatly appreciated.

TIA,
Paul
Back to top
spamiam



Joined: 13 Nov 2005
Posts: 665
Posted: 13 April 2008, 22:22 PM    Post subject: Re: Motion Sensing Reply with quote
pdubinsky wrote:
Has anyone had any experience with using any devices for detecting human motion in a room? I can see sonar or infra-red doing it but the project needs to detect when there hasn't been motion for a period of time not just the entry into a room and I'm not familiar with sensors that could be used. Any ideas, experiences, warnings would be greatly appreciated.

TIA,
Paul


Well, Sonar could work, thoug I have not had terribly good luck with it.

I think that you could use an IR motion detector. Just the exact same devices tht are used for burglar alarms. They have support circuitry, and generally will bring an output high or low if motion is sensed. It will eventually turn off after no motion is detected for a specific period of time.

You might use a microcontroller to measure the time since the detector last triggered (beyond the normal detector turn-off). Maybe some detectors are user-configurable to have a longer "on" time and then the uC would not have to do timekeeping.

-Tony
Back to top
stevech



Joined: 23 Feb 2006
Posts: 657
Posted: 14 April 2008, 1:56 AM    Post subject: Reply with quote
Room occupancy sensors. Commonplace in the industrial lighting world. essentially, a better IR motion detector than in consumer products.
Back to top
pdubinsky



Joined: 25 Nov 2005
Posts: 66
Location: South Carolina
Posted: 15 April 2008, 18:15 PM    Post subject: Reply with quote
Thanks for the info guys. I'd googled on infra-red but not "room occupancy sensor" (rolls right off the keyboard, doesn't it?) but never recognized what I was looking for. Eventually, I found the X10 based devices and the bare sensor from Parallax which is what I'll try to get a little smarter about the technolgy.

The application is monitoring an elderly (very) person in a multi-room apartment. She has the "I've fallen and I can't get up" pendant and service but that'll only work is she triggers it. I more interested in the software to drive the app and interpret the data.

I'll post progress about the project on the forum.

Thanks,
Paul
Back to top
stevech



Joined: 23 Feb 2006
Posts: 657
Posted: 16 April 2008, 2:38 AM    Post subject: Reply with quote
maybe a simple ball-in-tube switch. Or mercury tilt switch. If you can affix it so it doesn't false alarm unless the person is prone. If so, it could trigger a beeper or RF transmission to a call for aid device.

Oughta be pretty foolproof no matter what you come up with!
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Forum Index -> ZX-24 Time synchro. with the server - Timezone/DST with your computer
Page 1 of 1

 


All content Copyright © 2005-2012 Elba Corp. All Rights Reserved.
Opinions expressed in posts are those of the author and not necessarily those of Elba Corp.
Powered by phpBB © 2001, 2005 phpBB Group