sirakide@motcid.UUCP (Dean Sirakides) (08/01/90)
I'm toying with the idea of putting some small motion detectors throughout my house in key locations. I hope to have them all monitored by a simple micro-p. In my mind, the ideal sensor would be something like the rangefinder in poloroid cameras (small, low power, etc). Although a rangefinder might be more accurate than I need--all I really need is something that well register a change when a large (human) size movement occurs near a door or in a hall way. Does anyone have an idea of a manufacturer/model/source that might work for my purpose? Any idea what the interface is like? Any idea of price? Anybody had any luck with the idea already? Thanks in advance, Dean.
ee5391aa@hydra.unm.edu (Duke McMullan n5gax) (08/01/90)
In article <4315@hazel13.UUCP> sirakide@motcid.UUCP (Dean Sirakides) writes: >I'm toying with the idea of putting some small motion >detectors throughout my house in key locations. I hope ... >Does anyone have an idea of a manufacturer/model/source >that might work for my purpose? >Any idea what the interface is like? >Any idea of price? >Anybody had any luck with the idea already? Dean, I've had success with the IR motion detectors used for outdoor lights. I can pick up the unit at the local Price Club for $16, and although the DMM showed the electronics working on 16VDC, it seems to run fine on 12VDC. I have one mounted on a small plastic box, which contains a driver transistor and a relay for switching the 12V. With a small but loud siren attached, it makes a fine area-coverage (volume-coverage, actually ;^) burglar alarm. Right now, I'm building three complete alarm units for a local engineering firm. The original interface is an optoisolater. I replaced it with an LED for ex- perimental purposes, and added the transistor/relay later on when I put it in a box. That optoisolater switched the gate of a triac, which I removed, they being of limited use with DC. My experience is that they're damn hard to approach undetected. In a very hot room (~ body temp) they become considerably less sensitive, but you'd expect that. There's no distance parameter available, just the detect/nondetect line. In this particular model, the output line asserts and remains so for about five seconds after the motion ceases or moves out of range of the sensor head. When the phase of the moon is right, it proves consistently sensitive at over fifty feet (that's in cold weather). Try it. It's cheap; it's widely available; it may be just what you need. Best o' luck, d PS: I didn't make this clear: I REMOVE all the high voltage circuitry and the lamp sockets, etc. Bend it 'till it fits. d -- "...above all shadows rides the sun, and stars forever dwell...." - J.R.R. Tolkien Duke McMullan n5gax nss13429r phon505-255-4642 ee5391aa@hydra.unm.edu
ken@apollo.cs.pittsburgh.edu (Kenneth Moore) (08/10/90)
In article <4315@hazel13.UUCP> sirakide@motcid.UUCP (Dean Sirakides) writes:
=>I'm toying with the idea of putting some small motion
=>detectors throughout my house in key locations. I hope
=>to have them all monitored by a simple micro-p.
=>
=>Thanks in advance,
=>
=>Dean.
I saw motion detectors at my local Radio Shack. I didn't notice
the price.
--
I don't yell and I don't tell and I'm grateful as hell: Benny Hill