Motion Sensor / SX

PLJack

I'm starting to design a project with the SX that needs to detect motion. Specifically a human.
The device will be powered by batteries.

From what research I have done so far a P.I.R. sensor seems the best choice over IR and sonar.
PIR being a passive device seems to make sense from a power saving perspective.

I realize that Parallax has a PIR but it is much too large for the small package that I have in mind.

So, My question is, where can I source some PIRs?
My requirements are quite small. The field of view does not need to be that large.
Cost is important for I want to make a lot of these devices.

Any ideas, links, suggestions?

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- - - PLJack - - -

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Perfection in design is not achieved when there is nothing left to add.
It is achieved when there is nothing left to take away.

LoopyByteloose

There is a thermocouple and PIR manufacturer in Santa Rosa, California.

Having said that, I imagine they are much cheaper if you buy 10,000.
The PIR is certainly passive in tne sense that it does not transmit a signal and expect a reflection.

Some PIRs include electronics within them, others are just the minimal device. Since they are thermally sensitive, they require special handling when soldered.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

kelvin james

I found these, but a look at digikey on the panasonic was 33 bucks for each component in a package of 25 !

kelvin

www.fuji-piezo.com/ms400.htm
pewa.panasonic.com/pcsd/product/sens/select_motion.html

LoopyByteloose

That appears to be the same or nearly the same as the Parallax device, but without the needed electronics to convert it to digital information. You need to add a comparitor and a digital latch.

This is why Parallax's are more expensive. It is incomplete.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

kelvin james

Actually, the reason these are expensive is because they have the circuitry built into them. Not to take anything any from the one parallax sells, these would more suited to a small pcb application. Still $33 x 25 minimum quantity = $825, i don't think there will be too many takers, at least not me. PDF included .

kelvin

LoopyByteloose

OH! I thought they were 25 pieces for $33 or roughly $1.25 each.· I guess Parallax bought several thousand.

PIR and thermocouple prices seem to be all over the place.· I have 4 PIR units I bought for $3 each locally, but I see the same out there for $50 each.

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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)

······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan

Post Edited (Kramer) : 2/15/2006 7:48:55 AM GMT